Explore topic-wise InterviewSolutions in .

Ans :- Dissolves buildings and statues, especially those made of limestonemetals.

Kills marine lifeby making the water too acidic. Proteins in organisms, like enzymes, are pH sensitive. Low pH denatures these proteins and kills the organisms.

Kills trees. Similarly, proteins in trees are susceptible to pH changes. Acid also dissolves cuticles, the fatty layer on leaves that minimizes water loss. This leads to excessive loss of water and death.

Washes away critical mineral ions. Aluminum ions, in particular, can be toxic in high concentrations. Acid rain washes away these ions and concentrates them downstream, killing plants.

Causeseutrophication. Eutrophication is the process where oxygen in water is exhausted by rapidly dividing bacteria. Nitrate ions in acid rain encourages the growth of algae, causing an algae boom. The algae blocks the sunlight needed by underwater plants. These plants die. Bacteria feed on the death plants and respire aerobicly, using up the oxygen in water.

an antibiotic or group of antibiotics produced naturally by certain blue moulds, now usually prepared synthetically. Penicillin was discovered in 1928 and during the Second World War became the first antibiotic to be used by doctors.

That is the answer for your question

a substence that is used as a medicine (antibiotic) for preventing a treating disease and infection caused by bacteria

this is answer for your question

Penicillin is a group of antibiotics which include penicillin G, penicillin V, procaine penicillin, and benzathine penicillin. Penicillin antibiotics were among the first medications to be effective against many bacterial infections caused by staphylococci and streptococci.

White blood cell is the anser

RBC is red where as WBC is white in color....

RBC donot contain oxygen where WBC can

RBCit contains antigenit is red in colorit carry oxygenWBCit is immunityfull form white blood cellsit is also known as lymph

Nuclear fission is the process in which the nucleus of an atom breaks into smaller nuclei. These smaller nuclei are termed as fission products and when the fission reaction takes place some by products are also released.

Nuclear fusion is opposite to nuclear fission in the sense that it is a reaction in which two or more nuclei combine to form a heavy nuclide. However, the similar aspect of both the processes is that there is liberation of large amount of energy. Thus, nuclear fusion may be defined as a process in which lighter nuclei fuse together to form a heavier nucleus.

excretory system helps to throw the the waste out of the body after the body extracts almost all the important vitamins and minerals etc

excretory system help to throw the waste material out

excretory system helps to remove all the unwanted food material from our whole body and keeps our body clean

The excretory system of human beings collects the liquid wastes of the body and help it get rid of them

TheExcretory systemis responsible for the elimination of wastes produced by homeostasis. There are several parts of the body that are involved in this process, such as sweat glands, the liver, the lungs and the kidneysystem. Every human has two kidneys.

The four functions of the excretory system are to get rid of wastes, eliminate useless byproducts excreted from cells, eradicate harmful chemical buildups and maintain a steady, balanced chemical concentration in thebody.

ln human body,we excrete wastes mainly as urea.Not only human beings other animals such as many terrestrial amphibians and marine fishesmainly excrete urea and are called ureotelic animals.human also called as ureotelic animals.

The excretory system help to throw the waste material from the body.please like my answer

Unisexual flowers: Coconut flowers, Papaya, Watermelon, Cucumber

So option d - filtration of dead RBC will not be possible.

d)Mammals are warm-blooded animals. Their skin is covered by hair, sweat glands and oil glands that regulate body temperature. Coelom in mammals is divided into peritoneal, pleural and pericardial cavities. Breathing is through lungs. Four-chambered heart is present. Mammalian heart is made up of four chambers which include two atria and two ventricles. The organisms with this type of heart exhibit double circulation. The deoxygenated blood is completely separated from the oxygenated blood completely. The atria and ventricles are separated by many types of valves which prevent the mixing up of pure blood from that of impure blood. Mammals give birth to young ones through different modes. Mammals have milk-producing glands called as mammary glands to nourish their young ones.Aves are warm-blooded animals. Birds bear three clawless digits. Fore-limbs are modified into wings which aid in flight. Their hind limbs are strong and are developed for walking. Bones are hollow. Body is covered by feathers. Respiration is through lungs. They have four-chambered heart. Avian heart is a four chambered heart and complex in its evolution. It pumps more blood than mammalian heart as birds require lot of energy to fly high in the air. They lay eggs which hatch into chicks.

c)At one time, reptiles and amphibians were zoologically classified as reptiles due to their many similarities. It is speculated that reptiles transitioned from amphibians some 50 million years ago, which perhaps explains why there are so many commonly shared characteristics. Let's first identify those similarities between reptiles and amphibians.

Ectothermic: Both are ectothermic (cold-blooded) meaning their internal sources of heat are so insignificant that they must rely upon external sources to regulate their body temperature. Body heat regulation is primarily required for operation of their metabolic processes.

Chordata (animals that possess a spinal column): Both reptiles and amphibians are vertebrates possessing a central vertebral column.

Skin color alteration:Skin color alteration by concentrating or dissipating melanin is possible in many amphibians and reptiles. Altering their skin coloration aids in camouflage and can help thermoregulation of body temperature.

Keen eyesight:Many lizards (reptiles) and frogs (amphibians) have sharp eyesight which is crucial for their precise capture of prey by flicking their tongues.

Defensive traits:Both reptiles and amphibians use camouflage, biting and inflating of the body to avoid predation.Lizards (reptiles) and salamanders (amphibians) both have the ability to autotomize which is a voluntary removal of the tail as a defensive response.One common defense is mimicry where animals that have no innate defensive protection mimic the bright colors of dangerous animals.For example, a harmless king snake might appear as a venomous coral snake.

e)Nematoda-1-these are psuedocelomate2-their body is not segmented3-they have no close circulated system.4-they are group of round worms.5-they have no setae and are cylindrical

annelida - 1-these are acelomate2-their body is segmented3-they have close circulated system.4-these are not group of round worms5-they have setae and are not cylindrical

Bone is not uniformly solid, but includes a toughmatrix. This matrix makes up about 30% of the bone and the other 70% is of salts that give strength to it.The matrix is made up of between 90 and 95%collagenfibers, and the remainder isground substance.The primary tissue of bone,bone tissue(osseous tissue), is relativelyhardand lightweight. Its matrix is mostly made up of a composite material incorporating the inorganic mineralcalcium phosphatein the chemical arrangement termed calciumhydroxylapatite(this is thebone mineralthat gives bones their rigidity) andcollagen, an elastic protein which improves fracture resistance.The collagen of bone is known as ossein.Bone is formed by the hardening of this matrix around entrapped cells. When these cells become entrapped from osteoblasts they become osteocytes.

The chiefdifference between arteries and veinsis the job that they do.Arteriescarry oxygenated blood away from the heart to the body, andveinscarry oxygen-poor blood back from the body to the heart. Your body also contains other, smaller blood vessels.

ADVERTISEMENTS: TheGolgi apparatusoccurs in all eukaryotic cells except male gametes of bryophytes and pteridophytes, mature sieve tubes, some fungal cells, and mature sperms and RBCs of animals. It is alsoabsentin prokaryotic cells.

The normalplateletcount is 150,000-350,000 per microliter ofblood, but sinceplateletsare so small, they make up just a tiny fraction of theblood volume. Theprincipal function of plateletsis to preventbleeding.Red blood cellsare the most numerous blood cell, about 5,000,000 per microliter.

Myopia (also called nearsightedness) is the most common cause of impaired vision in people under age 40 — and in recent years, its prevalence is growing at an alarming rate.

option c is right There is a regular heteromorphic alternation of generations.

Sporophyte is the predominant plant body and is differentiated into root, stem and leaves.

Thallophyta is a division of the plant kingdom including primitive forms of plant life showing a simple plant body. Including unicellular to largealgae,fungi, lichens. The first ten phyla are referred to as thallophytes. They are simple plants withoutroots stemsorleaves.

The nature of a tooth paste is BASIC

The treaty is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. All of the ozone depleting substances controlled by theMontreal Protocolcontain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer).

a...internet protocolThe Internet protocol suite is therefore often referred to as TCP/IP

option (d) is correct.

In bryophytes, the zygote develops into a multicellular, undifferentiated structrure called embryo. The embryo within venter of archegorium, by further segmentation and differentiation finally develops into a full fledged sporophyte called sporogonium.

Made of many working parts, the human eye functions much like a digital camera. Here’s how it works.

Light enters the eye through thecornea, the clear front surface of the eye, which acts like a camera lens.

The iris works much like the diaphragm of a camera--controlling how much light reaches the back of the eye. It does this by automatically adjusting the size of the pupil which, in this scenario, functions like a camera's aperture.

The eye’s crystalline lens sits just behind the pupil and acts like autofocus camera lens, focusing on close and approaching objects.

Focused by the cornea and the crystalline lens, the light makes its way to the retina. This is the light-sensitive lining in the back of the eye. Think of the retina as the electronic image sensor of a digital camera. Its job is to convert images into electronic signals and send them to the optic nerve.

The optic nerve then transmits these signals to the visual cortex of the brain which creates our sense of sight.

A microscope is a scientific instrument. It makes small objects look larger. This lets people see the small things. People who use microscopes commonly in their jobs include doctors and scientists. Students in science classes such as biology or chemistry also use microscopes to study small things.

The earliest microscopes had only one lens and are called simple microscopes. Compound microscopes have at least two lenses. In a compound microscope, the lens closer to the eye is called the eyepiece. The lens at the other end is called the objective. The lenses multiply up, so a 10x eyepiece and a 40x objective together give 400x magnification.

Microscopes make things seem larger than they are, to about 1000 times larger. This is much stronger than a magnifying glass which works as a simple microscope.

The most common kind of microscope is the compound light microscope. In a compound light microscope, the object is illuminated: light is thrown on it. The user looks at the image formed by the object. Light passes through two lenses and makes the image bigger.

The second most common kind are a few kinds of electron microscopes. Transmission electron microscopes (TEMs) fire cathode rays into the object being looked at. This carries information about how the object looks into a magnetic "lens". The image is then magnified onto a television screen. Scanning electron microscopes also fire electrons at the object, but in a single beam. These lose their power when they strike the object, and the loss of power results in something else being generated—usually an X-ray. This is sensed and magnified onto a screen.

tnx

Amicroscopeis ascientificinstrument. It makes small objects look larger. This lets people see the small things. People who use microscopes commonly in their jobs includedoctorsandscientists.Students in science classes such asbiologyorchemistryalso use microscopes to study small things.

The earliest microscopes had only onelensand are calledsimple microscopes.Compound microscopeshave at least two lenses. In a compound microscope, the lens closer to the eye is called theeyepiece. The lens at the other end is called theobjective. The lenses multiply up, so a 10x eyepiece and a 40x objective together give 400x magnification.

Microscopes make things seem larger than they are, to about 1000 times larger. This is much stronger than amagnifying glasswhich works as a simple microscope.

Types of microscopes

The most common kind of microscope is the compoundlight microscope.In a compound light microscope, the object isilluminated: light is thrown on it. The user looks at the image formed by the object. Light passes through two lenses and makes the image bigger.

The second most common kind are a few kinds ofelectron microscopes.Transmission electron microscopes(TEMs) firecathode rays into the object being looked at. This carries information about how the object looks into a magnetic "lens". The image is then magnified onto atelevision screen.Scanning electron microscopesalso fire electrons at the object, but in a single beam. These lose their power when they strike the object, and the loss of power results in something else being generated—usually anX-ray. This is sensed and magnified onto a screen.

a compound light microscope is usually used for viewing tissue

The compoundmicroscopeisusedtoviewlarger organisms,organs,tissues, and small objects that can be seen with the naked eye but need more magnification toviewdetails

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U = 108 km/h => 108×5/18 => 6×5 => 30 m/sv = 0m/st = 4sectherefore , a = (v-u)/t =>a = (0-30)/4 => a = -30/4 => -7.5 m/s²

force = mass × accelerationforce = 1000 kg × (-7.5) m/s²force = -7500 kg m/s²=> force = -7500 N negative sign denotes opposing force

Autoimmunity

Theimmune systemdefends the body against infections and certain other diseases. It is made up of different organs, cells, and proteins known as antibodies. It identifies, attacks, and destroys germs and other foreign substances. Sometimes the immune system makes a mistake and attacks the body's own tissues or organs. This is called autoimmunity. One example of an autoimmune disease istype 1 diabetes, in which the immune system destroys the cells in the pancreas that produce insulin.

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yo.. immunity........

I still don't know that....

how A 10th grade student can answer...

that question... 🤔

I think in class X we studied it.

Answer:

Decomposersreturn matter to the system.

Explanation:

Matter is found in a limited amount on earth and has to be returned to the ecosystem in a usable form whenever an organism dies.Decomposersfill this role. They break down the body of the dead organism and return the matter in it to theecosystemvia several processes and stages.

In animals, enzymes within the body break down tissues andbacteriawithin the body do the same while releasing gases, causing bloat. Fluid leaks from any openings, and this type of liquid environment attracts flies and insects. Once most of the soft tissues have been broken down, the hard tissues, such as bones, remain. Throughout this process, nutrients escape into the soil and are consumed by other organisms. Thus, they are reused again. Decomposers release CO2 back into the atmosphere and NH3 into the soil.

Selecting plants with favorable or suitable variations is the second step in hybridization. In fact, in earlier days, selection was the only method of breeding. During the pre Mendelian era, selection was primarily based on phenotypic variations.

But as we know today, phenotypic selections may not breed true, off they could be heterozygote. Selection practiced now a day is exact and based on the genetic mechanism for a particular trait. Among the various individuals of a species growing in a Field, few are picked based on their phenotype.

Subsequently they are interbred and several generations of progenies are raised in order to find out whether the plant breeds true for the chosen character. There are two types of selection – Single plant selection and mass selection.

In single plant or pure line selection, several individual plants with superior phenotype are selected.

Usually a large number of plants are selected and are sown in separate lines. From these progeny, again individual plants are selected with the desired character. This is called Progeny testing.

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convolutedtubulesof the kidney. The proximal and distal convolutedtubulesof the nephron that, with the loop of Henle and collectingtubule, form the renaltubulethrough which the glomerular filtrate passes before entering the renal pelvis.

B) is the correct answer

Ingredients: water,tea powder,sugar,milkProcess:take a bowl nd pour 2glasses of water in it.Light the stove.after 2minutes pour 2teaspoons of teapowder nd sugar.Take some time it will boiled after it will becomes decosion .Now pour 1glass of milk take a time to boil thats it.Take a tasty tea (yummy yummy)

Option a is correct as a cell placed in hypotonic solution will swell up and finally burst.

option a is right answer

swell up option a is the correct answer

Ahypotonic solutionis anysolutionthat has a lower osmotic pressure than anothersolution. In the biological fields, this generally refers to asolutionthat has less solute and more water than anothersolution

hypotonic solution is a solution in which water content is high and salt content is low.The cell gets swell in the hypotonic solution

if the medium surrounding the cell has the higher water concentration than the cell meaning that the outside solution is very dilute , the cell will gain water by osmosis such a solution is known as hypotonic solution

1. Hypotonic:- having a lower osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.

2. Hypertonic:- having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.

3. Isotonic solution:- Anisotonic solutionrefers to twosolutionshaving the same osmotic pressure across a semipermeable membrane.

Many molecules in and around cells exist in concentration gradients across the cell membrane, meaning that the molecules are not always evenly distributed inside and outside of the cell. Hypertonic solutions have higher concentrations of dissolved molecules outside the cell, hypotonic solutions have lower concentrations outside the cell, and isotonic solutions have the same molecular concentrations inside and outside of the cell. Diffusion drives molecules to move from areas where they are in high concentration to areas where they are in a lower concentration. The diffusion of water is referred to as osmosis.

When placed into an hypertonic solution, animal cells will shrivel up, while plant cells will stay firm thanks to their air-filled vacuole. In a hypotonic solution, the cells will take on water and appear more plump. In an isotonic solution, they'll stay the same.

Hypertonic Solutions

A solution is hypertonic to a cell if it has a higher solute (dissolved substance) concentration than the cell does. As a result, it also has a lower concentration of water than the cell does. Cell membranes and plant cell walls are semipermeable barriers, which means that certain molecules can diffuse through them, while other molecules can not. Many solutes are too large or charged to cross the cell membrane but water can diffuse freely. In a hypertonic environment, osmosis forces water out of the cells.

Responses to Hypertonic Solutions

Plant cells have large sacs of fluid called vacuoles. When full, vacuoles push outward onto the plant's cell walls, keeping them stiff. When plants are placed in hypertonic solutions, their vacuoles shrink and no longer provide enough pressure to keep the plant from wilting. Because of their rigidity, the cell walls keep their rectangular shape but are less plump. In contrast, animal cells lack a cell wall, and so they shrivel up like raisins.

Hypotonic Solutions

A solution is hypotonic to a cell if it has a lower solute concentration than the cell does. As a result, it also has a higher concentration of water than the cell does. Osmosis draws water out of the solution and into the cells. As a result, plant and animal cells both appear more plump when placed in a hypotonic solution. When viewed under a microscope, the vacuoles of plant cells appear noticeably larger.

Isotonic Solutions

If the solution has the same solute concentration, and thus the same water concentration, as the cells do, it is isotonic to the cells. As a result, there would not be a concentration gradient since a gradient by definition involves a difference. There would thus be no net flow of water between the cell and the solution. This does not mean that water would not move between them, just that the rate of exiting and entering the cell are equal. There is no net change in the cell's appearance.

They usually do not have any membrane-wrapped organelles (e.g., nucleus, mitochondria, endoplasmic reticulum), but they do have an outer membrane. Most bacteria are also surrounded by at least one layer of cell wall. Bacteria are a huge and diverse group.

on the surface of intestine

So villi /microvilli are present in small intestine. The wall of small intestine is folded/tightly wrinkled into tiny hair like projections called villi.

These help in increasing the surface area many times and thus increasing the absorption of nutrients.

Villi:====

Villi are the numerous finger like projections, whose walls are richly supplied with blood capillaries and lymph vessels.

==================Function (Pancreas) :==================

Pancreasis a organ located in the upper abdomen and adjacent to the small intestine.It performs two main kind of functions in the body:

1) Exocrine function: It helps in the digestion of food. It produces various enzymes such as amylase, lipase and trypsin which helps to digest carbohydrate, fats and proteins respectively.

2) Endocrine function: It produces hormonal insulin and glucagon which regulate the level of sugar present in the blood.

Ans :- (i) The common name of Periplaneta americana is the American cockroach.

Answer:

Because the stomach doesn't absorb nutrients.

Explanation:

Villi of the small intestine are small finger-like projections on the surface. One villus contains many cells and thereby increase the surface area (see image below). This is required because a lot of nutrients have to be absorbed in the small intestine. Lots of cells on a small area makes this process efficient.

The stomach collects the food, adds gastric acid and enzymes for digestion of food. The stomach does not absorb any nutrients and therefore does not require a larger surface area.

Entomophily orinsect pollinationis a form ofpollinationwhereby pollen of plants, especially but not only of flowering plants, is distributed byinsects. .

The excretion of urea is calledureotelism. Land animals, mainly amphibians and mammals, convert ammonia into urea, aprocesswhich occurs in the liver and kidney. Urea is a less toxic compound than ammonia; two nitrogen atoms are eliminated through it and less water is needed for its excretion.

Tissue is a group of cells.No. plants and animals are not made up of same types of tissues.

No they have different tissues

Cuscuta plant is a parasite.