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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 9151. |
What is distillation explain two applications of it |
| Answer» Distillation refers to the selective boiling and subsequent condensation of a component in a liquid mixture. It is a separation technique that can be used to either increase the concentration of a particular component in the mixture or to obtain (almost) pure components from the mixture. The process of distillation exploits the difference in the boiling points of the components in the liquid mixture by forcing one of them into a gaseous state.Some important applications of distillation are listed below.\tDistillation plays an important role in many water purification techniques. Many desalination plants incorporate this method in order to obtain drinking water from seawater.\tDistilled water has numerous applications, such as in lead-acid batteries and low-volume humidifiers.\tMany fermented products such as alcoholic beverages are purified with the help of this method.\tMany perfumes and food flavorings are obtained from herbs and plants via distillation.\tOil stabilization is an important type of distillation that reduces the vapor pressure of the crude oil, enabling safe storage and transportation. | |
| 9152. |
Explain seprating funnel |
| Answer» It is used to\xa0separate\xa0a mixture of two immiscible liquids, like oil and water.Principle of\xa0Separating funnel\xa0: When a mixture of two immiscible liquids is kept in a\xa0separating funnel, the liquids\xa0separate\xa0out in layers depending on their densities with the heavier forming the top layer. | |
| 9153. |
Write the rules of binomial nomenclature ? |
| Answer» Binomial Nomenclature Rules\tThe entire two-part name must be written in italics (or underlined when handwritten).\tThe genus name is always written first.\tThe genus name must be capitalized.\tThe specific epithet is never capitalized. | |
| 9154. |
Explain in detail about how animals in vertebrata are classified into further subgroups with diagram |
| Answer» Animals in Vertebrata are classified into five classes:(i) Class Pisces: This class includes fish such as Scoliodon, tuna, rohu, shark, etc. These animals mostly live in water. Hence, they have special adaptive features such as a streamlined body, presence of a tail for movement, gills, etc. to live in water.(ii) Class Amphibia: It includes frogs, toads, and salamanders. These animals have a dual mode of life. In the larval stage, the respiratory organs are gills, but in the adult stage, respiration occurs through the lungs or skin. They lay eggs in water.(iii) Class Reptilia: It includes reptiles such as lizards, snakes, turtles, etc. They usually creep or crawl on land. The body of a reptile is covered with dry and cornified skin to prevent water loss. They lay eggs on land.(iv) Class Aves: It includes all birds such as sparrow, pigeon, crow, etc. Most of them have feathers. Their forelimbs are modified into wings for flight, while hind limbs are modified for walking and clasping. They lay eggs.(v) Class Mammalia: It includes a variety of animals which have milk producing glands to nourish their young ones. Some lay eggs and some give birth to young ones. Their skin has hair as well as sweat glands to regulate their body temperature. | |
| 9155. |
Activity 13.7 answer chapter 13 |
| Answer» | |
| 9156. |
Science chapter 13 activity 13.7 solutions |
| Answer» | |
| 9157. |
What is the other name of seprating funnel |
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Answer» Decantation A separatory funnel, also known as a separation funnel, separating funnel, or colloquially sep funnel, is a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities |
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| 9158. |
What is Brownian motion??? |
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Answer» Brownian movement or motion is\xa0zigzag, random movement of microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas.The zigzag random movement of collodial particles in a collodial solution is called Brownian movement. Brownian movement or motion is\xa0zigzag, random movement of microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas.The zigzag random movement of collodial particles in a collodial solution is called Brownian movement. Wrong answer manisha. It is a body typically |
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| 9159. |
What is the function of blood (5 points) |
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Answer» The various functions of Blood include :\tIt supplies oxygen and carbon dioxide between the lungs and rest of the body.\tIt supplies essential nutrients to cells such as Amino acid, Fatty acid, Glucose etc.\tIt transports waste products to be removed by kidney.\tIt transports hormones.\tIt has role in inflammation. Eg. leucocytes destroys microorganisms, Platelets initiate blood clotting etc.\tIt regulates our body temperature.\tIt regulates pH by interacting acids and bases. Blood has many different functions, including:transporting oxygen and nutrients to the lungs and\xa0tissues.forming blood clots to prevent excess blood loss.carrying cells and antibodies that fight infection.bringing waste products to the kidneys and liver, which filter and clean the blood.regulating\xa0body\xa0temperature. |
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| 9160. |
Parts of cell organelles. Explain with examples. |
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Answer» 6 Cell OrganellesNucleus.\xa0nucleus.Ribosomes.Endoplasmic reticulum.Golgi apparatus. Chloroplasts. Mitochondria. Various components present inside a cell are known as cell organelles. For example plasma membrane, nucleus cytoplasm all are cell organelles.The plasma membrane also termed as a Cell Membrane or Cytoplasmic\xa0Membrane. It\xa0is a selectively permeable membrane of the cell, which is\xa0composed of a lipid bilayer and proteins.The cytoplasm is present both in plant and animal cells. They are jelly-like substance,\xa0found between the cell membrane and nucleus. They are mainly composed of water, organic and inorganic compounds.The nucleus is a double-membraned organelle found in all eukaryotic cells. It is the largest organelle, which functions as the control centre of the cellular activities and is the storehouse of the cell’s DNA. By structure, the nucleus is dark, round, surrounded by a nuclear membrane.\xa0 Cell organelles are membrane bound little structures that perform activities in the cell. The various cell organelles are – Endoplasmic Reticulum, Ribosomes, Golgi apparatus, Lysosomes, Mitochondria, Plastids, Vacuoles, Peroxisomes and Centrosome.i. Endoplasmic Reticulum: The endoplasmic reticulum (ER) is a large network of membrane-bound tubes and sheets which looks like long tubules or round or oblong bags (vesicles). There are two types of ER– rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER looks rough under a microscope because it has ribosomes attached to its surface. The ribosomes are the sites of protein manufacture. The SER helps in the manufacture of fat molecules or lipids. Some of these proteins and lipids help in building the cell membrane. This process is known as membrane biogenesis. Some other proteins and lipids function as enzymes and hormones.ii. Golgi Apparatus: The Golgi apparatus was first described by Camillo Golgi. Golgi apparatus consists of a set of membrane-bounded, fluid filled vesicles, vacuoles and flattened cisternae. Cisternae are usually stacked together (placed one above the other) in parallel rows. Golgi apparatus exists as an extensive network near the nucleus in the animal cells. However, the plant cells contain many freely distributed subunits of Golgi apparatus, called dictyosomes. The Golgi apparatus arises from the membrane of the smooth endoplasmic reticulum, which in turn, originates from the rough endoplasmic reticulum. |
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| 9161. |
Explain the different types of cell organelles with its types functions. |
| Answer» There are various organelles present within the cell and are\xa0classified into three categories based\xa0on the presence or absence of membrane.Organelles without membrane:\xa0The Cell wall, Ribosomes, and Cytoskeleton are membrane-bound cell organelles.\xa0They are present both in\xa0prokaryotic cell\xa0and the eukaryotic cell.Single membrane-bound organelles:\xa0Vacuole, Lysosome, Golgi Apparatus, Endoplasmic Reticulum are single membrane-bound organelles present only in a eukaryotic cell.Double membrane-bound organelles:\xa0Mitochondria and chloroplast are double membrane-bound organelles present only in a eukaryotic cell. | |
| 9162. |
Please explain difference between stroma and grana in chloroplast. |
| Answer» \tGranaStromaGrana are made of stacks of thylakoids.Stroma is the fluid present in the chloroplastLight reactions occur here.Dark reactions occur here.\t | |
| 9163. |
Is plasma membrane and cell membrane the same? |
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Answer» Yes Yes Yes Yes Yes |
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| 9164. |
What are unicellular organism |
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Answer» Unicellular organisms\tUnicellular organisms are composed of single cell.\tThe single cell constitutes the structure and entire function of the organism.\tFor example, Amoeba found in marine areas or areas of decaying water is a microorganism composed of single cell that determines the shape of the amoeba.\tChlamydomonas is another example of unicellular organism found in marine regions.\tParamecium is also unicellular organism. Organism which have only one cell For example - ameboa Organism which are composed of only one cell |
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| 9165. |
4 function of epithelial tissues |
| Answer» Functions1)They form the outer layer of skin.They protect underlying cells from drying,injury,chemical effects etc.2)Form lining of mouth and alimentary canal,protect these organs.3)Help in absorption of water and nutrients.4)It forms barrier to keep different body system separate.5)Form lining of blood vessels,alveoli,kidney tubules.6)They secrete a variety of substances such as sweat saliva,enzymes etc. | |
| 9166. |
Do plant cells have lysosomes? If not,why? |
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Answer» Yes Yes |
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| 9167. |
Why direct heating of ink is avoided during separation of ink? |
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Answer» Direct heating of ink may lead to decomposition or change in chemical composition of ink. To avoid this , we give it hot water bath. when we direct heat ink for separation of ink from dye , the ink may get fully evaporated or can be defected.Hope this would help ?? |
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| 9168. |
What are mitochondria |
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Answer» Mitochondria is a power house or we say kitchen house of cell. It has it\'s own DNA and Ribosomes. Mitochondria are double membrane bound cell organelles which are the site of cellular respiration. It is the power house of the cell as it synthesizes energy rich molecules called ATP which are the energy currency of the cell. They are semi - autonomous in nature. Mitochondria are the power house of the cell and it supplies energy Mitochondria are power house of the cell. It is a doubled layer membrane. It produces ATP ie Adenosine Tri Phosphate which is an energy currency of an organism. |
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| 9169. |
What are vesicles (question from fundamental unit of life) |
| Answer» A\xa0vesicle is a small membrane-enclosed sac that can store or transport substances. Vesicles are mainly involved in the transportation of material in/out or within the cell.They are made of at least one layer of the phospholipid-bilayer; which is the major constituent of the cell membrane. | |
| 9170. |
The actual particle size of suspension is 100 nm or 1000 nm |
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Answer» The size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometre (10−910-9\xa0metre).\xa0General Characteristics of Suspension:Suspensions are heterogeneous mixture of two or more substances.Particles of solute do not dissolve in solvent rather they remain suspended in bulk throughout.The size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometre (10−910-9\xa0metre).Suspension shows Tyndall effect because of their large size of particles.When suspension is left for some time, particles get settled in bottom.Therefore, suspension is not stable.The particles of suspension can be separated through the process of filtration.Suspension does not scatter light when particles are settled because in this case suspension breaks.Milk of magnesia, fog, mixture of chalk and water, etc. are some examples of suspension. The size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometre (10−910-9\xa0metre).\xa0General Characteristics of Suspension:\tSuspensions are heterogeneous mixture of two or more substances.\tParticles of solute do not dissolve in solvent rather they remain suspended in bulk throughout.\tThe size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometre (10−910-9\xa0metre).\tSuspension shows Tyndall effect because of their large size of particles.\tWhen suspension is left for some time, particles get settled in bottom.\tTherefore, suspension is not stable.\tThe particles of suspension can be separated through the process of filtration.\tSuspension does not scatter light when particles are settled because in this case suspension breaks.\tMilk of magnesia, fog, mixture of chalk and water, etc. are some examples of suspension. |
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| 9171. |
What is the name of scientist who found book "Science"? |
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Answer» what is that LOG INSUBSCRIBETHE SCIENCES25 Greatest Science Books of All TimeDiscover staff present the essential reading list for anyone interested in science.By\xa0the editors of DISCOVER magazineDecember 8, 2006 11:30 AM(Credit: stevemart/Shutterstock)NewsletterSign up for our email newsletter for the latest science newsSign up for the NewsletterSIGN UP1. and 2.\xa0The Voyage of the Beagle\xa0(1845) and\xa0The Origin of Species\xa0(1859) by Charles Darwin [tie]One of the most delightful, witty, and beautifully written of all natural histories,\xa0The Voyage of the Beagle\xa0recounts the young Darwin\'s 1831 to 1836 trip to South America, the Galápagos Islands, Australia, and back again to England, a journey that transformed his understanding of biology and fed the development of his ideas about evolution. Fossils spring to life on the page as Darwin describes his adventures, which include encounters with "savages" in Tierra del Fuego, an accidental meal of a rare bird in Patagonia (which was then named in Darwin\'s honor), and wobbly attempts to ride Galápagos tortoises.Yet Darwin\'s masterwork is, undeniably,\xa0The Origin of Species,\xa0in which he introduced his theory of evolution by natural selection. Prior to its publication, the prevailing view was that each species had existed in its current form since the moment of divine creation and that humans were a privileged form of life, above and apart from nature. Darwin\'s theory knocked us from that pedestal. Wary of a religious backlash, he kept his ideas secret for almost two decades while bolstering them with additional observations and experiments. The result is an avalanche of detail — there seems to be no species he did not contemplate — thankfully delivered in accessible, conversational prose. A century and a half later, Darwin\'s paean to evolution still begs to be heard: "There is grandeur in this view of life," he wrote, that "from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.""The most important science book of all time. Darwin revolutionized our understanding of life, the relationship of humanity to all creatures in the world, and the mythological foundation of all religions."— geneticist Lee M. Silver, Princeton University3.\xa0Philosophiae Naturalis Principia Mathematica\xa0(Mathematical Principles of Natural Philosophy) by Isaac Newton (1687)Dramatic\xa0is an unlikely word for a book that devotes half its pages to deconstructions of ellipses, parabolas, and tangents. Yet the cognitive power on display here can trigger chills.\xa0Principia\xa0marks the dawn of modern physics, beginning with the familiar three laws of motion ("To every action there is always opposed an equal reaction" is the third). Later Newton explains the eccentric paths of comets, notes the similarity between sound waves and ripples on a pond, and makes his famous case that gravity guides the orbit of the moon as surely as it defines the arc of a tossed pebble. The text is dry but accessible to anyone with a high school education — an opportunity to commune with perhaps the top genius in the history of science."You don\'t have to be a Newton junkie like me to really find it gripping. I mean how amazing is it that this guy was able to figure out that the same force that lets a bird poop on your head governs the motions of planets in the heavens? That is towering genius, no?"— psychiatrist Richard A. Friedman, Cornell University4.\xa0Dialogue Concerning the Two Chief World Systems\xa0by Galileo Galilei (1632)Pope Urban VIII sanctioned Galileo to write a neutral treatise on Copernicus\'s new, sun-centered view of the solar system. Galileo responded with this cheeky conversation between three characters: a supporter of Copernicus, an educated layman, and an old-fashioned follower of Aristotle. This last one — a dull thinker named Simplicio — represented the church position, and Galileo was soon standing before the Inquisition. Galileo comes across as a masterful raconteur; his discussions of recent astronomical findings in particular evoke an electrifying sense of discovery. The last section, in which he erroneously argues that ocean tides prove Earth is in motion, is fascinatingly shoddy by comparison. Galileo, trying to deliver a fatal blow to the church\'s Aristotelian thinking, got tripped up by his own faith in an idea he was sure was true but couldn\'t prove."It\'s not only one of the most influential books in the history of the world but a wonderful read. Clear, entertaining, moving, and often hilarious, it showed early on how science writing needn\'t be stuffy."— cognitive scientist Steven Pinker, Harvard University5.\xa0De Revolutionibus Orbium Coelestium\xa0(On the Revolutions of Heavenly Spheres) by Nicolaus Copernicus (1543)Copernicus waited until he was on his deathbed to publish this volume, then prefaced it with a ring-kissing letter to Pope Paul III explaining why the work wasn\'t really heresy. No furor actually ensued until long after Copernicus\'s death, when Galileo\'s run-in with the church landed\xa0De Revolutionibus\xa0on the Inquisition\'s index of forbidden books (see #4, above).Copernicus, by arguing that Earth and the other planets move around the sun (rather than everything revolving around Earth), sparked a revolution in which scientific thought first dared to depart from religious dogma. While no longer forbidden,\xa0De Revolutionibus\xa0is hardly user-friendly. The book\'s title page gives fair warning: "Let no one untrained in geometry enter here."6.\xa0Physica\xa0(Physics) by Aristotle (circa 330 B.C.)By contrast, Aristotle placed Earth firmly at the center of the cosmos, and viewed the universe as a neat set of nested spheres. He also mistakenly concluded that things move differently on Earth and in the heavens. Nevertheless,\xa0Physica,\xa0Aristotle\'s treatise on the nature of motion, change, and time, stands out because in it he presented a systematic way of studying the natural world — one that held sway for two millennia and led to modern scientific method."Aristotle opened the door to the empirical sciences, in contrast to Platonism\'s love of pure reason. You cannot overestimate his influence on the West and the world."—bioethicist Arthur Caplan, University of Pennsylvania7.\xa0De Humani Corporis Fabrica\xa0(On the Fabric of the Human Body) by Andreas Vesalius (1543)In 1543, the same year that Copernicus\'s\xa0De Revolutionibus\xa0appeared, anatomist Andreas Vesalius published the world\'s first comprehensive illustrated anatomy textbook. For centuries, anatomists had dissected the human body according to instructions spelled out by ancient Greek texts. Vesalius dispensed with that dusty methodology and conducted his own dissections, reporting findings that departed from the ancients\' on numerous points of anatomy. The hundreds of illustrations, many rendered in meticulous detail by students of Titian\'s studio, are ravishing.8.\xa0Relativity: The Special and General Theory\xa0by Albert Einstein (1916)Albert Einstein\'s theories overturned long-held notions about bodies in motion. Time and space, he showed, are not absolutes. A moving yardstick shrinks in flight; a clock mounted on that yardstick runs slow.\xa0Relativity,\xa0written for those not acquainted with the underlying math, reveals Einstein as a skillful popularizer of his ideas.To explain the special theory of relativity, Einstein invites us on board a train filled with rulers and clocks; for the more complex general theory, we career in a cosmic elevator through empty space. As Einstein warns in his preface, however, the book does demand "a fair amount of patience and force of will on the part of the reader."9.\xa0The Selfish Gene\xa0by Richard Dawkins (1976)In this enduring popularization of evolutionary biology, Dawkins argues that our genes do not exist to perpetuate us; instead, we are useful machines that serve to perpetuate them. This unexpected shift in perspective, a "gene\'s-eye view of nature," is an enjoyable \xad\xadbrainteaser for the uninitiated. So is a related notion: that altruistic behavior in animals does not evolve for "the good of the species" but is really selfishness in disguise. "Like successful Chicago gangsters," Dawkins writes, "our genes have survived, in some cases for millions of years, in a highly competitive world."10.\xa0One Two Three ... Infinity\xa0by George Gamow (1947)Illustrating these tales with his own charming sketches, renowned Russian-born physicist Gamow covers the gamut of science from the Big Bang to the curvature of space and the amount of mysterious genetic material in our bodies (DNA had not yet been described). No one can read this book and conclude that science is dull. Who but a physicist would analyze the atomic constituents of genetic material and calculate how much all that material, if extracted from every cell in your body, would weigh? (The answer is less than two ounces.)"Influenced my decision to become a physicist and is part of the reason I write books for the public today."— theoretical physicist Lawrence M. Krauss, Case Western Reserve University11.\xa0The Double Helix\xa0by James D. Watson (1968)James Watson\'s frank, and often frankly rude, account of his role in discovering the structure of DNA infuriated nearly everyone whose name appeared in it, but it nonetheless ranks as a first-rate piece of science writing.\xa0The Double Helix\xa0takes us inside a pell-mell race whose winners were almost guaranteed fame and a Nobel Prize.Most poignant are Watson\'s disparaging descriptions of his encounters with DNA researcher Rosalind Franklin. Her X-ray crystallography images showed the molecule to be a helix, crucial data that Watson and his collaborator Francis Crick "borrowed" to construct their DNA model. Franklin died of ovarian cancer in 1958, losing out on the 1962 Nobel Prize for the discovery. Perhaps to atone, Watson noted her key contribution in the epilogue to his book."The\xa0telenovela\xa0of my generation of geneticists."— geneticist Mary-Claire King, University of Washington12.\xa0What Is Life?\xa0by Erwin Schrödinger (1944)Long a classic among biologists, this volume describes, from the perspective of a Nobel Prize-winning physicist, how living organisms differ from inanimate objects like crystals. Schrödinger carefully outlines how the two groups obey different laws and puzzles over what the "paragon of orderliness" of living things may signify. Some editions include an autobiographical sketch, in which Schrödinger describes the conflict over teaching Darwin that raged when he was in school, as well as his own fascination with evolution."What Is Life?\xa0is what got Francis Crick and the other pioneers of molecular biology in the 1950s interested in the problem in the first place."— cognitive scientist Steven Pinker, Harvard University13.\xa0The Cosmic Connection\xa0by Carl Sagan (1973)At a time when NASA was reeling from the end of the Apollo program, Sagan reacquainted both the public and his colleagues with the majesty of the universe, starting with the oft-overlooked worlds of our own solar system.He also championed the search for extraterrestrial life and argued for the likelihood of planets around other stars two decades before they were discovered. The TV series\xa0Cosmos\xa0brought Sagan to the masses, but the adventure began here.14.\xa0The Insect Societies\xa0by Edward O. Wilson (1971)The patriarch of modern evolutionary biology explores the lives of everyone\'s favorite creepy crawlies — ants, termites, bees, and wasps — in this 500-page treatise unmatched in scope and detail by any other work on the topic (with the possible exception of his own 1990 volume,\xa0The Ants).It also lays the groundwork for his 1975 classic,\xa0Sociobiology: The New Synthesis,\xa0which explores the then-controversial idea that the social behavior of animals, including humans, has a deep biological basis. The book is a labor of love, infused with the author\'s boundless fascination for his tiny subjects. Wilson openly acknowledges the quirkiness of his obsession; the dedication reads, "For my wife Irene, who understands."15.\xa0The First Three Minutes\xa0by Steven Weinberg (1977)When Weinberg was a student, "the study of the early universe was widely regarded as not the sort of thing to which a respectable scientist would devote his time." But after World War II, radar researchers turned their instruments to the sky and helped bring creation stories out of the realm of myth and into the realm of science.Weinberg, winner of the 1979 Nobel Prize in Physics, offered the first authoritative, popular account of the resulting Big Bang scenario in\xa0The First Three Minutes.\xa0A 1993 afterword discusses more recent advances. Amazingly, only the description of the first fraction of a second of cosmic history has changed significantly.16.\xa0Silent Spring\xa0by Rachel Carson (1962)When\xa0Silent Spring\xa0was first published, a chorus of critics called Carson "hysterical" and "extremist." Yet the marine biologist\'s meticulously documented indictment of DDT led both to a U.S. ban on the insecticide and to the birth of the modern environmental movement. Carson argues that DDT not only indiscriminately kills insects, including beneficial species like bees, but also accumulates in the fat of birds and mammals high on the food chain, thinning eggshells and causing reproductive problems.Her chilling vision of a birdless America is still haunting. "Over increasingly large areas of the United States," she writes, "spring now comes unheralded by the return of the birds, and the early mornings are strangely silent where once they were filled with the beauty of birdsong."17.\xa0The Mismeasure of Man\xa0by Stephen Jay Gould (1981)In this witty critique of bad science, Harvard scholar Stephen Jay Gould sets out to eviscerate the notion of biological determinism. For hundreds of years, Gould argues, questionable measurements of human intelligence, like skull size or IQ, have been used to justify racism, sexism, and class stratification.According to Gould, even respected sociologists and psychologists have used falsified or shaky data to support the belief that Westerners are genetically predisposed to rule the world. The book drew political and scientific criticism, especially from social scientists furious that Gould had oversimplified or demonized their work.18.\xa0The Man Who Mistook His Wife for a Hat and Other Clinical Tales\xa0by Oliver Sacks (1985)In these profiles of patients with unusual neurological disorders, Sacks revolutionizes the centuries-old literary tradition of presenting clinical case studies. Far from dryly reporting each case, the eminent British-born New York City neurologist writes in lively prose with the gentle affection of a country doctor on house call and a contagious sense of wonder.To him, the man with Tourette\'s syndrome and the woman who cannot sense her own body position are the heroes of the stories. Legions of neuroscientists now probing the mysteries of the human brain cite this book as their greatest inspiration.19.\xa0The Journals of Lewis and Clark by Meriwether Lewis and William Clark (1814)One of history\'s most famous tales of exploration began on May 14, 1804, when William Clark and his Corps of Discovery set off from the mouth of the Missouri River, beginning an epic 28-month journey west to the shores of the Pacific Ocean. (Meriwether Lewis joined the group two days later.) The\xa0Journals, a meticulous chronicle of their expedition, offer an unprecedented glimpse at unexplored, undeveloped America west of the Mississippi.Lewis, the group\'s naturalist and astronomer, and Clark, the surveyor, documented new species of wildlife (coyotes, jackrabbits, mule deer, and others), unfamiliar geology, and interactions with native peoples. A complete copy of the\xa0Journals\xa0and their companion material is heavy reading (the definitive Nebraska edition has 13 volumes), but an abridged version captures all the adventure in a palatably sized package.20.\xa0The Feynman Lectures on Physics\xa0by Richard P. Feynman, Robert B. Leighton, and Matthew Sands (1963)Not only did physicist Richard Feynman win the 1965 Nobel Prize for his work on quantum electrodynamics, he once played bongos for a San Francisco ballet. The beloved book\xa0Surely You\'re Joking, Mr. Feynman!\xa0recounts his raucous adventures, but these undergraduate physics lectures, presented over two years at Caltech in the 1960s, are Feynman\'s true gift to students at all levels.The first 94 lectures cover a wide swath of basic physics, from Newtonian mechanics to electromagnetism, while the final 21 venture into quantum mechanics. Feynman\'s characteristic humor and peerless explanations elevate these classroom lessons to enduring classics."Feynman, the prankster-genius, appeals no matter what field you\'re in. It helps to know some basic physics to approach his lectures, but he has such a luminous mind and is so good with metaphor that you can grasp a fair amount about what\'s going on in modern physics without formal understanding of complex math, up to a point."— psychiatrist Richard A. Friedman, Cornell University21.\xa0Sexual Behavior in the Human Male\xa0by Alfred C. Kinsey et al. (1948)The first of two books known collectively as the Kinsey Report, this treatise became an improbable best seller. With raw, technical descriptions of sexual acts, distilled from thousands of interviews, it documented for the first time what people really do behind closed doors.Many researchers consider the book flawed because of its sampling bias: Most of the men interviewed were young, white, and eager to participate. Nevertheless, the work remains an outstanding model of scientific bravery in the 20th century, with its insistence that sexual acts be described as healthy functions of the human body and that cultural taboos not stand in the way of science.22.\xa0Gorillas in the Mist\xa0by Dian Fossey (1983)In a richly hued portrait of the lives and behavior of African mountain gorillas, Fossey documents her 13 years dwelling in a remote rain forest amid these enigmatic animals. One of a trio of protégés picked by famed anthropologist Louis Leakey to conduct field studies of great apes, Fossey was determined, devoted, and often angry — over the apes\' diminishing habitat and especially over the danger they faced from poachers (who may have been responsible for Fossey\'s 1985 murder). In\xa0Gorillas\xa0she leaves behind a scientific treasure, one rendered more poignant by her death in the service of these peaceful, intelligent beasts.23.\xa0Under a Lucky Star\xa0by Roy Chapman Andrews (1943)Roy Chapman Andrews made scientific history during the 1920s by leading five motorized expeditions into unexplored reaches of the Gobi desert. He emerged with the equivalent of paleontological gold: more than 350 new species (including the dinosaurs\xa0Protoceratops\xa0and\xa0Velociraptor), the first fossils of Cretaceous mammals, and the first nests of dinosaur eggs.He packed out plenty of wild tales, too, which are woven into this engaging autobiography. Rumors persist that the fedora-wearing, snake-hating, death-defying explorer may have served as the inspiration for Hollywood\'s Indiana Jones.24.\xa0Micrographia\xa0by Robert Hooke (1665)A revelation in its time,\xa0Micrographia\xa0exposed the previously hidden microscopic world. Hooke, an early developer of the compound microscope, used his device to peer at the eyes of flies, the stinger on a bee, hairs, bristles, sand particles, seeds, and more, noting every detail with both words and masterful illustrations.The original book is a hefty three pounds, so the digital versions now available are more convenient, but there is something to be said for flipping through a printed copy and discovering, like a hidden treasure, each drawing in its beautiful intricacy.25.\xa0Gaia\xa0by James Lovelock (1979)As an inventor of scientific instruments, James Lovelock may seem an unlikely figure to have launched a New Age, earth-mother environmental movement. Yet that\'s exactly what he accomplished with\xa0Gaia: A New Look at Life on Earth.\xa0In it Lovelock laid out his daring idea that our planet is a single, self-regulating system, dubbed Gaia, wherein "the entire range of living matter on Earth, from whales to viruses, and from oaks to algae, could be regarded as constituting a single living entity, capable of manipulating the Earth\'s atmosphere to suit its overall needs."Lovelock has since refined the hypothesis, which many scientists criticized as quasi mystical, and notes that he never implied that Gaia was a sentient being.biologyevolutionphysicspollutionMORE FROM DISCOVERPLANET EARTHCongrats, Jellyfish, the Seas Are Yours! (Now, What Are You Going to Do with Them?)PLANET EARTHHow Strong Were Ancient Humans? Modern-Day Athletes Are a Window to the PastHEALTHWhat Would Happen If We Didn’t Have Vaccines?PLANET EARTH5 Skulls That Shook Up the Story of Human EvolutionPLANET EARTHThat Word You Heard: TroglomorphismPLANET EARTHDid Giants Ever Exist? The Question Isn’t as Crazy as It SoundsRECOMMENDATIONS FROM OUR STOREMY SCIENCE SHOPStrange ScienceMY SCIENCE SHOPElements FlashcardsMY SCIENCE SHOPEinstein\'s UniverseMY SCIENCE SHOPCosmos: Possible WorldsSHOP NOWSTAY CURIOUSJOINOUR LISTSign up for our weekly science updates.Sign up for the NewsletterSIGN UPView our privacy policySUBSCRIBETO THE MAGAZINESave up to\xa070% off\xa0the cover price when you subscribe to\xa0Discover\xa0magazine.SubscribeTHE MAGAZINEABOUT DISCOVERSHOP OUR STOREPRIVACY POLICYSUBSCRIBEADVERTISENEWSLETTERTERMS OF USECUSTOMER SERVICECONTACTCOPYRIGHT POLICYTRIPS & TOURSCOPYRIGHT ©\xa02020\xa0KALMBACH MEDIA CO.WEBSITE ACCESSIBIL |
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| 9172. |
Explain the differences between male & female reproductive part. |
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| Answer» | BASIS FOR COMPARISON | MALE REPRODUCTIVE ORGAN | FEMALE REPRODUCTIVE ORGAN | \t\t\tMeaningMale reproductive organ functions to produce sperms and transfer it to the female reproductive organ to get fertilized and produce the new one of their kind.Female reproductive organ functions in producing ovum (eggs) and when get fuse with the male gamete (sperms), produces the young ones and nurture it till the full growth before birth.LocatedThe reproductive system of the male is located outside the body and around the pelvis region, to maintain the temperature required by the sperm to stay healthy.The female reproductive system is located entirely inside the body, with entry and exit points at the vulva, and separate openings for urination and menstruation.Hormones producedAndrogen and Testosterone.Progesterone and Estrogen.Contains important parts like*****, seminal vesicles, vas deferens, prostate, Cowper\'s gland and ******* (testes).Vulva, ******, ********, urethra, hymen, perineum, cervix, uterus, Fallopian tubes, mammary gland.Functions1. Produce sperm. 2. To provide sperm to the ovum for fertilization.1. Produce ovum. 2. Recieve and fertilize the male sperm. 3. Support the development of the growing embryo. 4. To provide nourishment to the infants (newborn) by secreting milk in mammary glands (breast).\t|
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| 9173. |
Amoeba andar ke Mela ke jaanta hai |
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Answer» Its a humble request to ask questions in english ? Amoeba is a unicellular organism where single cell performs all the processes like nutrition, respiration, excretion, reproduction etc. The process of procuring food is called as nutrition. Amoeba extends its pseudopodia when the food is found. Pseudopodium just wraps around the food molecule and forms a food vacuole around it. Inside the food molecule, lots of digestive enzymes are secreted to break and digest the food molecule into smaller absorbable substances. Its body helps in its gaseous exchange. Reproduction is by binary fission. It causes a disease called as amoebiasis. This disease affects the intestinal system of the patient. |
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| 9174. |
Difference between sound and light waves |
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Answer» \tSound wavesLight waves1. They are longitudinal waves2. They cannot travel through vacuum3. Its speed in air is 330 m/s1. They are transverse waves2. They do not require medium to propagate3. Its speed in air or vacuum is 3x108\xa0m/s\t \xa0 Sound waves travel with compression or rear faction but light wave travel perpendicularly |
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| 9175. |
Describe various types of Epithelial tissue with diagram |
| Answer» \tIt consists of cells which form membranes.\tThis membrane covers the body surface and the glands.\tThe covering or protective tissues in the animal body are epithelial tissues.\tEpithelium covers most organs and cavities within the body.\tIt also forms a barrier to keep different body systems separate.\tThe skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.\tThe cells are tightly packed and form a continuous sheet. | |
| 9176. |
Explain the difference of connective tissue |
| Answer» \tIt protects and supports the body.\tThe cells are loosely spaced and embedded in an intercellular matrix.\tThe matrix may be jelly like, fluid, dense or rigid.\tThe nature of matrix differs in concordance with the function of the particular connective tissue.\xa0 | |
| 9177. |
Explain simple tissue with diagram |
| Answer» A group of cells that are similar in structure and work together to achieve a particular function is called a tissue | |
| 9178. |
Atom are electrically neutral. justify the statement. |
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Answer» A N S W E RA t o m s is electrically neutral as the number of protons is equal to the number of electrons. Therefore the negative and positive charge cancels out. Hgll |
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| 9179. |
What is centrifugation. Explain with example |
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Answer» It is a method of separating the suspended particles of a substance from a liquid in which the mixture is rotated at high speed in a centrifuge.This method is useful in case the suspended particles in a liquid are too small too be retained by filter paper.Principle of Centrifugation:When a mixture is rotated very fast, the denser particles are forced to go to the bottom of the centrifuge and the lighter particles stay at the top.Applications of Centrifugation:Used in dairies to separate cream from milk.Used in washing machines to squeeze out water from wet clothes. \xa0Centrifugation.Answer:\xa0Sometimes the solid particles in a liquid are very small and pass through a filter paper. For such particles the filtration technique cannot be used for separation. Such mixtures are separated by centrifugation. The principle is that the denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly. |
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| 9180. |
Atom are electrical neutral.justify the statement |
| Answer» Atoms\xa0are\xa0electrically neutral\xa0because they have equal numbers of protons (positively charged) and electrons (negatively charged). If\xa0an atom\xa0gains or loses one or more electrons, it becomes an ion. If it gains one or more electrons, it now carries a net negative charge, and is thus "anionic. | |
| 9181. |
Tell me the amount of solute and solvent present in 2% (by mass) of glucose solution |
| Answer» | |
| 9182. |
What is the chemical formulation of sodium chloride?? |
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Answer» Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl. NaCl Sodium Chloride\xa0is an ionic compound with the\xa0chemical formula NaCl.\xa0Sodium Chloride\xa0is also known as salt. Sodium Chloride\xa0is an ionic compound with the\xa0chemical formula NaCl.\xa0Sodium Chloride\xa0is also known as salt. |
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| 9183. |
Write one functions of each type of plastid chromoplast leucoplast and chlorophyll |
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Answer» Thank you \xa0\tPlastid is a membrane-bound organelle found in the cell of plants, algae and few eukaryotic cells.\tIt the site of production and storage of important chemical compounds which are used by the cells of autotrophic organisms.\tThey contain pigments which are used in photosynthesis and the types of pigments determine the cell\'s colour.\tThe types of plastids are-1)\xa0Chloroplasts:- are the green plastids which contain chlorophyll pigments for photosynthesis.2) Chromoplasts:- are the coloured plastids for pigment synthesis and storage.\tThe pigment present in them is carotene which gives a different colour to fruits and flowers.3) Gerontoplasts:- are the chloroplasts that are going through the ageing process.\tThese are present in the leaves in which no more photosynthesis occurs (such as in the fall months).4) Leucoplasts: are the colourless plastids for monoterpene synthesis found in non- photosynthetic parts of the plants.\tThey are of three types:-\xa0a)\xa0Amyloplasts- stores starch.b) Proteinoplasts- stores proteins.c) Elaioplasts- stores fats and oils. |
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| 9184. |
Assertion and reasoning of chapter 9 and 10 |
| Answer» | |
| 9185. |
What is dispersed phase and dispersing medium in very simple words |
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Answer» It is used in coloids onlyDispersed phase=soluteDispersing medium= solvent The phase that is scattered or\xa0present in the form of colloidal particles is called the\xa0dispersed phase.The medium in which the colloidal particles are dispersed is called the\xa0dispersion medium.Example: In a starch solution, starch represents the dispersed phase, while water represents the\xa0dispersion medium. |
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| 9186. |
Difference between phloem and xylem? |
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Answer» Thanks Difference Between Xylem and PhloemXylem\xa0is the complex, dead and permanent tissue responsible for carrying nutrients and water, whereas\xa0phloem\xa0is the soft and permanent tissue play its role in transporting the food and other organic material produced by the green parts especially leaves by the process of photosynthesis.Xylem and phloem are the two types of\xa0vascular tissues, present in plants and together constitute vascular bundles. Their function is to\xa0efficiently\xa0transport\xa0the materials which can be food, water, nutrients, organic materials, etc. between the stems, roots, and leaves of plants. Hope it satisfies u 1 \xa0\xa0Differences between xylem and phloem\tXylemPhloem1. It conducts water and minerals from roots to leaves.1. It conducts food from leaves to all parts of the plant.2. It is composed of mainly dead elements.2. It is composed of mainly living elements.3. Transport is unidirectional.3. Transport is bidirectional.4. It has four types of cells: Tracheids, Vessels, Xylem parenchyma and Xylem fibres.4. It has four types of cells: Phloem fibres, Sieve tubes, Companion cells and Phloem parenchyma.\t |
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| 9187. |
Ask me a question |
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Answer» Asked Electrons The negative charge on particle Define elctrons |
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| 9188. |
What is cellular organisms? |
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Answer» 4y= Those organisms whose bodies are composed of cells are known as cellular organisms. Cellular organisms are further categorized into unicellular and multicellular. Unicellular organisms are composed of single cell while multicellular organisms are composed of many cells. Bacteria are the examples of unicellular organisms while Ulothrix is an example of multicellular organism.Any creature that is made of cells that are able to replicate on their own. Humans, insects, plants, archaea, and bacteria are all cellular organisms.\xa0 |
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| 9189. |
Write a short note on cell theory |
| Answer» Cell theory is a theory which introduce the properties of cell.Cell theory says that:1. Cell is the structural and functional unit of life.2. All organisms are made up of two or more cells.3. All cells develop from pre-existing cells | |
| 9190. |
What is physical state of matter |
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Answer» Ok mad There are three states of matter – solid, liquid and gas.Solid:\xa0Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.Liquid:\xa0Matters which have fixed volume but indefinite shape are called liquids. For example - milk, water, petrol, kerosene, alcohol, oil, etc. Since liquid can flow, it is also called fluid.Gas:\xa0Matters which have indefinite shape and volume are called gases. For example - air, oxygen, hydrogen, nitrogen, carbon-dioxide, etc. |
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| 9191. |
Is air homogeneous mixture? |
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Answer» Yes Yes air is a homogeneous mixture because it comprises of different gases Yes |
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| 9192. |
What is the area under the slope of V-T graph? |
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Answer» Hlo Displacement Displacement |
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| 9193. |
Define:prokryotic and eukryotic cell |
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Answer» The term “prokaryote” is derived from the Greek word “pro“, (meaning: before) and “karyon” (meaning: kernel). It translates to “before nuclei.“The term “Eukaryotes” is derived from the Greek word “eu“, (meaning: good) and “karyon” (meaning: kernel), therefore, translating to “good or true nuclei.” Eukaryotes are more complex and much larger than the prokaryotes. They include almost all the major kingdoms except kingdom monera.\xa0\t\xa0Prokaryotic cell Eukaryotic cell1Nucleus absentNucleus present2One chromosome presentMore than one chromosome3Membrane bound cell organelles absentMembrane bound cell organelles present4Cell size very small.Cell size comparatively larger.5Cell division occurs by budding or fission.Cell division occurs by mitosis or meiosis\t Ha |
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| 9194. |
What are collieds,suspension,and mixtures |
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Answer» All good here ColloidsA colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.For Example: - Soap solution, Milk, Ink, Blood and solutions of synthetic detergents.MixturesA mixture is a substance which consists of two or more elements or compounds not chemically combined together.For Example: - Air is a mixture of gases like oxygen, nitrogen, argon, CO2\xa0and water vapour.SuspensionsThose substances which are insoluble in water form suspensions.A suspension is a heterogeneous mixture in which the small particles of a solid are spread throughout a liquid without dissolving.For Example:-Chalk-powder, muddy water, milk of magnesia, flour in water etc. Colloids\tA colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.\tFor Example: - Soap solution, Milk, Ink, Blood and solutions of synthetic detergents.Mixtures\tA mixture is a substance which consists of two or more elements or compounds not chemically combined together.\tFor Example: - Air is a mixture of gases like oxygen, nitrogen, argon, CO2\xa0and water vapour.Suspensions\tThose substances which are insoluble in water form suspensions.\tA suspension is a heterogeneous mixture in which the small particles of a solid are spread throughout a liquid without dissolving.\tFor Example:-Chalk-powder, muddy water, milk of magnesia, flour in water etc. |
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| 9195. |
Difference between mass and inertia. |
| Answer» Mass is\xa0a measure of the amount of matter\xa0in an\xa0object.\xa0Inertia is\xa0the resistance of a physical object to any change in its state of motion. | |
| 9196. |
State two ways in which phleom is functionally different from xylem |
| Answer» Phloem helps in\xa0transportation of food and nutrients from leaves to storage organs whereas xylem transports water and minerals from roots to aerial parts of plant.-Phloem provided no mechanical function whereas xylem provides mechanical support.- Phloem has bidirectional movements whereas xylem has single direction movements | |
| 9197. |
Describe the states of matter |
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Answer» Solid ,liquid and gaseus The matter has been classified in three different states :-solid -liquid -gas And there are two more states Plasma Bose Einstein condensate There are three states of matterSolidLiquidGas Three states of matter Solid, Liquid and gas Three types of matters solid, liquid and gas |
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| 9198. |
Which causes more burn steam or boiling water |
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Answer» Steam Steam Stem Steam |
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| 9199. |
What is function of stomach |
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Answer» It serves as a muscular bag which is situated towards the left side of the abdominal cavity, beneath the diaphragm. This vital organ acts as a storage for the food and provides enough time to digest meals. The stomach also produces digestive enzymes and hydrochloric acid that maintains the process of digestion.\t\tMucous: It is an aqueous secretion produced by the mucous membranes. It functions by protecting the stomach lining and gastric pits from the acid, which is produced by the glands to destroy the bacteria that entered along with the food particles.\t\t\tDigestive enzymes: They are the group of enzymes which functions by breaking down polymeric macromolecules like biopolymers into their smaller and simpler substances.\t\t\tHydrochloric acid: It is the digestive fluid formed by the stomach during the process of digestion. It functions by destroying harmful microorganisms present in the food particles.\t The core functions of the human stomach is as an aid to digestion |
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| 9200. |
Explain the neuron tissue with diagram |
| Answer» The neuron tissue has 3 parts i.e. dendrites, axon and nerve endings. The dendrites receive messages, the axon takes the message away and nerve endings pass on the messages to other nerves. Diagram is there on google. | |