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InterviewSolution
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.
| 6351. |
Gymnosperm...?? |
| Answer» | |
| 6352. |
Give the example of Eubacteria |
| Answer» The single-celled prokaryotic microorganisms with various range of characteristics are called Eubacteria or true bacteria. These types of microorganisms are found in almost all conditions. They do not consist of membrane nuclei. The cell wall of Eubacteria is made up of peptidoglycans in a cross-linked chain pattern. | |
| 6353. |
Write a note on Amino acids |
| Answer» Amino acids are normal components of cell proteins (called amino acid). They are 20 in number specified in genetic code and universal in viruses, prokaryotes and eukaryotes. Otherwise amino acids may be termed rare amino acids, which take part in protein synthesis e.g. hydroxyproline and non- protein amino acids do not take part in protein synthesis e.g. Ornithin, citrullin, gama-aminobutyric acid (GABA) a neurotransmitter, etc. | |
| 6354. |
Write a note on a Nucleic acids |
| Answer» Nucleic acids\tNucleic acids are long chain polymers of nucleotides; hence called Polynucleotides\tThey are found inside nucleus, hence called Nucleic acids\t2 types of nucleic acids:\tDNA\tDeoxyribonucleic AcidSpecify order of amino acids in a polypeptideStore genetic information, has capacity to duplicateDouble-stranded structure \t\t\tRNA\tRibonucleic acidHelps in Polypeptide synthesisConvey genetic information, cannot self replicateSingle stranded structure\t\t | |
| 6355. |
Explain Watson-Crick model on DNA structure? |
| Answer» The\xa0Watson-Crick Model\xa0of\xa0DNA\xa0(1953) Deoxyribonucleic Acid (DNA) is a double-stranded, helical molecule. It consists of two sugar-phosphate backbones on the outside, held together by hydrogen bonds between pairs of nitrogenous bases on the inside.Watson and Crick DNA ModelDNA\xa0stands for Deoxyribonucleic acid\xa0which is a molecule that contains the instructions an organism needs to develop, live and reproduce.It is a type of nucleic acid and is one of the four major types of macromolecules that are known to be essential for all forms of life.\xa0 | |
| 6356. |
Differences between blood and lymph ?? |
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Answer» थ \tBLOODLYMPH1. It is red coloured fluid connective tissue that contains RBCs.\xa01. It is colourless fluid connective tissue in which RBCs are absent.\xa02. It is associated with circulation of Oxygen and Carbon dioxide.\xa02. It helps in body defence and is a part of immune system.\xa03. It contains plasma, RBC\'s, WBC\'s, platelets and proteins.\xa03. It contains plasma, less number of WBC\'s and platelets. It lacks proteins.\t |
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| 6357. |
Hello?all |
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Answer» Hello sona No personal msge here hlo dear Hello |
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| 6358. |
Hlo ....?? |
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Answer» Hii Hii ? Hloo Hii..?✌ |
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| 6359. |
Describe the structure of golgi apparatus and specify it\'s function |
| Answer» Golgi apparatus is a complex cytoplasmic structure made up of smooth membrane saccules or cisternae, a network of tubules with vesicles and vacuoles, which takes part in membrane transformation, secretion, and production of complex biochemicals. The shape and size of Golgi body are not fixed. They depend upon the physiological state of the cells. Usually the Golgi body is made up of four parts - cisternae, tubules, vesicles, and vacuoles.\tCisternae: Golgi body consists of a stack of generally 4-8 membrane-bound saccules or cisternae. The saccules are freq curved to give a definite polarity to the Golgi body. One face of the apparatus is convex while the other is concave.\tTubules: They form a complicated network towards the periphery and maturing face of the apparatus. Actually, tubules arise due to fenestrations of the cisternae. They have a diameter of 30-50 nm. The tubules interconnect the different cisternae.\tVesicles: They are small sacs of 20-80 nm diameters. The vesicles are found attached to the tips of tubules at various levels in the network. They are of two types, smooth and coated.\tGolgian vacuoles: They are expanded parts of the cisternae which have become modified to form vacuoles. The vacuoles develop from the concave or maturing face. Golgian vacuoles contain the amorphous or granular substance. Some of the Golgian vacuole functions as lysosomes.Functions:\tAll glandular cells depend upon Golgi body for concentrating and packaging their products inside a soluble proteins coat.\tThe Golgi body brings about membrane transformation, that is, converting one type of membrane into other types.\tProteins synthesized by the rough endoplasmic reticulum and lipids synthesized by smooth endoplasmic reticulum reach the cisternae of the Golgi body. Here, they combine with carbohydrates to form glycoproteins and glycolipids. | |
| 6360. |
Who are the members of kingdom monera and kingdom protista |
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Answer» Kingdom Monera=Archaebacteria,Eubacteria, cyanobacteriaKingdom Protista=chrysophytes(desmids),diagnoflagellates,euglenas,slime moulds,protozoans 1) Kingdom Monera is considered as the most primitive group of organisms and monerans are most abundant of all. It generally comprises unicellular organisms with a prokaryotic cell organization. They lack well-defined cell structures including the nucleus and other cell organelles.They consist of prokaryotes which include species like the Cyanobacteria, archaebacteria, mycoplasma, and bacteria are a few members of this kingdom.\xa02) All unicellular eukaryotic organisms are placed under the Kingdom Protista.The term Protista was first used by Ernst Haeckel in the year 1886. This kingdom forms a link between other kingdoms of fungi, plants, and animals.Kingdom Protista is an important phase in early evolution and the very first\xa0protist\xa0probably evolved 1.7 billion years ago.Kingdom Protista is a very large group comprising of at least 16 phyla. Many species of this kingdom are the primary producers in the aquatic ecosystem and some are responsible for serious human diseases like malaria. |
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| 6361. |
yogita ingl is very helpful.. I must say |
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Answer» Muskan you had left this app am I right ? Before boards when someone teased you ? Tgen how you are here muskan singh ? Ya but I had seen yogita Ingle in other classes also.... ?? |
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| 6362. |
What is pacemaker? |
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Answer» The answer above is very much lengthy and useless SAN is a pacemaker i.e. it creates electrical impulses with a constant rythum and if it stops working then AVN creates electrical impulses but it doesn\'t works with a rhythm means that there is variation sometimes it makes heart pump at the rate 62 but on another time the rate decreases therefore it is not able to maintain the pace of heart but SAN has a tendency to maintain pace of heart that\'s why it is known as pacemaker and HEART of heart Pace maker is a neuro muscular structure which produces and regulates cardiac impulses. Natural pacemaker is sino-atrial node (SA node).The SAN is a patch of cardiac musculature tissue present in the right upper corner of the right atrium. It has the\xa0ability to generate action potentials without\xa0any external stimuli, i.e., it is autoexcitable.\xa0The SAN can generate the maximum number of action\xa0potentials, i.e., 70-75 min–1, and is responsible for initiating and\xa0maintaining the rhythmic contractile activity of the heart.\xa0Artificial pacemaker:\xa0is a medical device which uses electrical impulses, delivered by electrodes contracting the heart muscles, to regulate the beating of the heart.Sometimes the SAN i.e. pacemaker gets damaged and fails to generate cardiac impluses. This defect can be corrected by installing an artificial apparatus or pacemaker in the chest of the patient. Artificial pacemaker is connected to right ventricle. The apparatus stimulates the heart electrically at regular time intervals and maintains the heart beat. |
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| 6363. |
States of cell |
| Answer» By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified\xa0cell\xa0theory. The unified\xa0cell\xa0theory\xa0states\xa0that: all living things are composed of one or more\xa0cells; the\xa0cell\xa0is the basic unit of life; and new\xa0cells\xa0arise from existing\xa0cells | |
| 6364. |
Why metabolism, cellular organisation and consciousness is the defining property of living? |
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Answer» Plz Support me. Consciousness is the state of being aware of surrounding. It is defined by the ability of the organism to respond to the stimulus which is known as irritability. If an organism is able to respond to stimuli, that means it is aware. As irritability is defining the property of life, so consciousness can be considered as defining\xa0property\xa0of a living organism.Metabolism is the ability to split\xa0the complex substance (catabolism) and convert them into simpler ones which further forms energy (anabolism). The energy helps to carry several metabolic and physiological function which makes metabolism an important and defining property of life. |
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| 6365. |
Asestivation |
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Answer» Aestivation or estivation is the positional arrangement of the parts of a flower within a flower bud before it has opened. Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation: the arrangement of leaves within a vegetative bud. aestivation/ˌiːstɪˈveɪʃ(ə)n,ˌɛstɪˈveɪʃ(ə)n/nounnoun:\xa0aestivation; noun:\xa0estivation1.ZOOLOGYprolonged torpor or dormancy of an insect, fish, or amphibian during a hot or dry period.2.BOTANYthe arrangement of petals and sepals in a flower bud before it opens. |
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| 6366. |
Which member of chlorophycae found in a lichen(fungi)? |
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Answer» Chlorophycae is a part of algae(plant kingdom) But I want to know that which member of chlorophycae made a lichen with fungi A lichen, or lichenized fungus, is actually two organisms functioning as a single, stable unit. Lichens comprise a fungus living in a symbiotic relationship with an alga or cyanobacterium (or both in some instances). There are about 17,000 species of lichen worldwide. |
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| 6367. |
Which phytohormone is growth inhibitor? |
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Answer» Abscisic acid is the hormone which inhibits the plant\xa0growth, and also it is responsible for wilting of the leaves, germination of the seed, it is responsible for stimulating the closure of stomata in the epidermis and it also helps in increasing the tolerance of the plants to various stressful situations Abscisic Acid or ABA |
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| 6368. |
Define kingdom monera |
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Answer» 1. These are sole members of bacteria 2. They are of two types (i) Eubacteria (ii) Archaebacteria3. Some are speherical shaped some are comma shaped some are spiral shaped and some are rod shaped..4. Methogens ,halophiles & Thermoacidophiles etc.... \t\tThe Monerans are unicellular organisms.\t\t\tThey contain 70S ribosomes.\t\t\tThe DNA is naked and is not bound by a nuclear membrane.\t\t\tIt lacks organelles like mitochondria, lysosomes, plastids, Golgi bodies, endoplasmic reticulum, centrosome, etc.\t\t\tThey reproduce asexually by binary fission or budding.\t\t\tThe cell wall is rigid and made up of peptidoglycan.\t\t\tFlagellum serves as the locomotory organ.\t\t\tThese are environmental decomposers\t\t\tThey show different modes of nutrition such as autotrophic, parasitic, heterotrophic, or saprophytic.\t |
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| 6369. |
What is meaning of morphology |
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Answer» Morphology is the branch of biological science that deals with the study of form, size, colour, structure and relative position of various parts of organisms.Importance of morphology-\tKnowledge of morphology is essential for recognition or identification of plants.\tIt gives information about the range of variations found in species.\tDeficiency and toxicity symptoms are morphological changes that occur in response to shortage or excess of minerals. Morphology is the form and structure of animals and plants.. |
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| 6370. |
Defination of marphology ???? |
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Answer» Morphology:- Study of external features of an organism. Morphology is the study of physical features of an organism. Morphology is the branch of biological science that deals with the study of form, size, colour, structure and relative position of various parts of organisms.Importance of morphology-\tKnowledge of morphology is essential for recognition or identification of plants.\tIt gives information about the range of variations found in species.\tDeficiency and toxicity symptoms are morphological changes that occur in response to shortage or excess of minerals. ???? |
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| 6371. |
Define _interkinesis |
| Answer» Preparation of second meiotic division occurs during interkinesis. Interkinesis or interphase II is a period of rest that cells of some species enter during meiosis, between meiosis I and meiosis II. No DNA replication occurs during Interkinesis. However, it does occur during the interphase I stage of meiosis. Each chromosome still consists of two chromatids. | |
| 6372. |
Describe the_(a) Synapsis and (b) Chiasmata |
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Answer» Thanks Synapsis:\xa0The pairing of homologous chromosomes is called synapsis. This occurs during the second stage of prophase I or zygotene.Chiasmata:\xa0Chiasmata is the site where two non sister chromatids have crossed over. It represents the site of cross-over. It is formed during the diplotene stage of prophase I of meiosis. |
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| 6373. |
Diagrammatic view of cell cycle |
| Answer» The cell cycle was discovered by Prevost and Dumas (1824) while studying the cleavage of zygote of Frog.\xa0It is a series of stages a cell passes through, to divide and produce new cells.This entire process where with the help of one single parent cell a new cell population grows and develops is known as the cell cycle.\xa0 | |
| 6374. |
List the main difference between mitosis and meiosis |
| Answer» \tMitosisMeiosisInterphaseEach chromosome replicates. The result is two genetically identical sister chromatidsChromosomes not yet visible but DNA has been duplicated or replicatedProphaseProphase –Each of the duplicated chromosomes appears as two identical or equal sister chromatids, The mitotic spindle begins to form. Chromosomes condense and thickenProphase I – crossing-over recombination – Homologous chromosomes (each consists of two sister chromatids) appear together as pairs. Tetrad is the structure that is formed. Segments of chromosomes are exchanged between non-sister chromatids at crossover points known as chiasmata (crossing-over)MetaphaseMetaphase -The chromosomes assemble at the equator at the metaphase plateMetaphase I Chromosomes adjust on the metaphase plate. Chromosomes are still intact and arranged as pairs of homologuesAnaphaseAnaphase – The spindle fibres begin to contract. This starts to pull the sister chromatids apart. At the end of anaphase, a complete set of daughter chromosomes is found each poleAnaphase I Sister chromatids stay intact. However, homologous chromosomes drift to the opposite or reverse poles \xa0\xa0Mode of ReproductionAsexual ReproductionSexual ReproductionOccurrenceAll the cellsReproductive cellsFunctionGeneral growth and repair, Cell reproductionGenetic diversity through sexual reproductionCytokinesisOccurs in TelophaseOccurs in Telophase I and in Telophase IIDiscovered byWalther FlemmingOscar Hertwig\t | |
| 6375. |
What is life....? |
| Answer» the condition that distinguishes animals and plants from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death. | |
| 6376. |
How to motivate ourselves? |
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Answer» Jst have a strong aim to achieve smthing special that keeps you going....?? Just Think for what you had started... Just Think for what you had started... |
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| 6377. |
1.Name the significant tissues of animal body and write their general functions ? |
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Answer» 1] Epithelial Tissue. They cover the body, organs, blood vessels and all body cavities. ...2] Muscular Tissue. Smooth, Skeletal, and Cardiac Muscles. ...3] Connective Tissue. Connective tissues are made up of fibrous cells. ...4] Nervous Tissue. Neuron Structure. 1. Epithelial Tissue. They cover the body, organs, blood vessels and all body cavities. 2. Muscular Tissue. Smooth, Skeletal, and Cardiac Muscles.3. Connective Tissue. Connective tissues are made up of fibrous cells. 4. Nervous Tissue. Neuron Structure. |
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| 6378. |
Chapter 9 biomolecules ke 50 M.C.Q Questions and answer |
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| 6379. |
In ferns,xylem is present in which form? |
| Answer» Mesarch.... | |
| 6380. |
Write the characteristic features of ctenophora with two example |
| Answer» Characteristic features of Phylum Ctenophora:i. They show biradial symmetry and are triploblastic.ii. They are characterized by the presence of eight rows of cilia that help in locomotion.iii. Ctenophores possess sticky cells called colloblasts to capture prey.iv. They lack skeletal, respiratory or excretory system.Examples : Hydra, Tubularia, Bougainvillea, Hydractinia, Eudendrium, Pennaria, Obelia, Sertularia, Plumularia | |
| 6381. |
Short note on antennal |
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| 6382. |
Can universe exist without life...? Give one reason for your answer... |
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Answer» Nhi 1 December se h... Aap school ja rhe Ho Ab....? Kuch khas nahi bas chal rahi hai...aap batao exam ho gaya?? Mai bhi badhiya..... Pdhai kaise chl rhi h...? I don\'t know |
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| 6383. |
Write a 3 pigments name of brown algae |
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Answer» The members of Phaeophyceae or brown algae possess chlorophyll a, chlorophyll c, carotenoids and xanthophyll. They vary in colour depending upon the amount of the xanthophyll pigment, fucoxanthin present in them Chlorophyll a,c and fucoxanthun |
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| 6384. |
C3, c4, c2 cycles |
| Answer» Sometimes in C3\xa0plants, RuBisCO binds to oxygen molecules and the reaction deviates from the regular metabolic pathway. The combination of RuBP and oxygen molecules leads to the formation of one molecule of phosphoglycerate and phosphoglycolate. This pathway is called photorespiration. During\xa0photorespiration, no sugar or ATP molecules are synthesized, but just CO2\xa0is released at the expense of ATP and the whole process is futile.However, C4\xa0plants do not undergo photorespiration due to their special mechanism to increase the CO2\xa0level for enzyme binding. During the Hatch and Slack Pathway, the C4\xa0acid, oxaloacetic acid (OAA) breaks down to release CO2. This ensures the high concentration of intercellular CO2. Thus, in C4\xa0plants, RuBisCO is more active as a carboxylase enzyme rather than as oxygenase. This is why C4\xa0plants have better productivity. | |
| 6385. |
Store House of the cell |
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Answer» Mitochondria is known as store house of cell Vacuoles Mitochondria synthesize energy-rich molecules that is ATP. They are so-called because they carry out the process of aerobic respiration and generate the energy molecules (ATP or Adenosine Triphosphate) for cell operation. Therefore they are known as the powerhouse of the cell. Vacuoles is known as store house of the cell |
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| 6386. |
What is bivalent ? |
| Answer» Bivalent: Complex formed by a pair of synapsed homologous chromosomes is called a bivalent. It is also known as a tetrad. | |
| 6387. |
List out all the events of meiosis I &II cell division |
| Answer» Meiosis contains\xa0two\xa0separate cell divisions, meaning that one parent cell can produce four gametes (eggs in females, sperm in males). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.\xa0Haploid cells\xa0cannot\xa0undergo meiosis; diploid\xa0cells\xa0cannot form gametes without\xa0undergoing meiosis. | |
| 6388. |
State the difference between chemical and electrical transmission. |
| Answer» \tElectrical TransmissionChemical TransmissionIt occurs at electric synapse. Synaptic cleft may or may not be present. At electrical synapses, electrical current can flow directly from one neuron into the other across these synapses. Impulse transmission across an electrical transmission is always faster.It occurs at chemical synapse. Synaptic cleft is present. At chemical synapse, neurotransmitter from pre-synaptic neurons transfer to post-synaptic neurons leading to transmission of impulse. Chemical transmission is slower.\t | |
| 6389. |
Write the salient features of phylum arthropoda |
| Answer» \tOrgan system level of organization\xa0\tBilaterally symmetrical\xa0\tTriploblastic\xa0\tSegmented body\xa0\tBody is divisible into head,thorax and abdomen\xa0\tJointed appendages\xa0\tRespiratory organs- gills,book gills,book lungs or tracheal systems\xa0\tCirculatory system- open\xa0\tBody cavity- haemocoel | |
| 6390. |
An almirah is sold at rupees 5225 after allowing a discount of 5%. Find it\'s marked price. |
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Answer» SP = Rs 5225Let MP be xdiscount = 5% of x =(5/100)x = 0.05xSP = MP - discount⇒5225 = x - 0.05x⇒0.95x = 5225⇒x = 5225/0.95 = 5500∴MP = Rs 5500 SP = Rs 5225Let MP be xdiscount = 5% of x =(5/100)x = 0.05xSP = MP - discount⇒5225 = x - 0.05x⇒0.95x = 5225⇒x = 5225/0.95 = 5500∴MP = Rs 5500 |
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| 6391. |
Anti durietic hormone |
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Answer» Vassopressin ADH- Anti-diuretic HormoneADH, also known as arginine vasopressin, is a hormone produced by the hypothalamus and stored in the posterior pituitary gland. It is made up of special nerve cells found at the base of the hypothalamus. The hormone is transported to the pituitary gland via axons, where it is released into the bloodstream. It regulates and balances the amount of water in the blood.Functions Of ADH\tIt acts on the kidneys and the blood vessels and functions to control the blood pressure. Higher concentrations of ADH constrict the\xa0blood vessels\xa0which increases the blood pressure.\tIt allows the water in the urine to be taken back in a specific area in the kidney and thus reduces the amount of water excreted through the urine thereby conserving the volume of the fluid in the body.\tIt is mainly responsible for homeostasis. |
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| 6392. |
Is virus living or non living |
| Answer» Viruses are non-living features intermediate between non-living and living organisms. On the basis of characters, such as non-cellular organization, inactivity outside the host organism, lack of respiration and cellular metabolism, these are caused non-living. Moreover, similar to non-living objects viruses can be crystallized and precipitated.\xa0Living Feature Similar to living beings, they possess genetic material (DNA or RNA), property of mutation, irritability, can grow and multiply inside the host cell. They are intracellular obligate parasites and attack specific hosts. Thus, keeping these points in mind, it is quite difficult to ascertain whether viruses are living or non-living. | |
| 6393. |
Dental formula of milk dentition |
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Answer» 2102 The\xa0dental formula represents the arrangement of teeth in each half of the upper and the lower jaw. The entire formula is multiplied by two to represent the total number of teeth.The dental formula\xa0for milk teeth in humans is:Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, and 2 molars. Premolars are absent in milk teeth hence the zero.The dental formula for\xa0permanent teeth in humans is:\xa0Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, 2 premolars, and 3 molars. An adult human has 32 permanent teeth. |
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| 6394. |
What is name of the connecting link between protozoa and porifera? |
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Answer» Thanks for answering...I want to ask that yogita ingle is a teacher of any school I just ask don\'t take it in a wrong way Proterospongia is a colonial choanoflagellate protozoan that closely resembles a sponge and act as\xa0connecting link between\xa0Protozoa\xa0and\xa0Porifera. It\xa0is a genus of single-celled aquatic organisms which form colonies.\xa0It consists of a number of cells embedded in a jelly-like matrix. |
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| 6395. |
What is the name of the branch of biology which deals with study of sponges? |
| Answer» Parazoology\xa0is the branch of science that deals with the study of sponges. | |
| 6396. |
What is villas and vilai |
| Answer» The tiny projections on the inner surface of the small intestine which help in absorbing the digested food are called villi. These helps to increase the surface area of intestinal walls.These are located in the inner walls of the small intestine.Their function is to increase the surface area of the small intestinal wall for absorption of the digested food. | |
| 6397. |
Write a characteristic features of DNA |
| Answer» Salient Features of DNA Double-Helix\tIt consists of two polynucleotide chains where the sugar and phosphate group form the backbone and the nitrogenous bases project inside the helix.\tThe two polynucleotide chains have anti-parallel polarity i.e. if one strand has 5′\xa0→ 3′ polarity, the other strand has 3′\xa0→ 5′ polarity.\tThe bases on the opposite strands are connected through hydrogen bonds forming base pairs (bp). Adenine always forms two hydrogen bonds with thymine from the opposite strand and vice-versa. Guanine forms three hydrogen bonds with cytosine from the opposite strand and vice-versa. Therefore, a purine always pairs with a pyrimidine on the other strand, giving rise to a uniform distance between the two strands of the helix.\tThe two strands coil in a right-handed fashion. Each turn of the helix is 3.4nm (or 34 Angstrom units) consisting of 10 nucleotides. These nucleotides are at a distance of 0.34nm (or 3.4 Angstrom units).\tThe helix is stable because of the base pairs that stack over one another and hydrogen bonds that hold the bases together. | |
| 6398. |
Full from of DNA and RNA |
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Answer» DNA- Deoxyribonucleic acid RNA- Ribonucleic acid \tDNA (Deoxyribonucleic acid)RNA (Ribonucleic acid)DefinitionIt is a long polymer. It has a deoxyribose and phosphate backbone having four distinct bases: thymine, adenine, cytosine, and guanine.Is a polymer with a ribose and phosphate backbone with four varying bases: uracil, cytosine, adenine, and guanine.LocationIt is located in the nucleus of a cell and in the mitochondria.It is found in the cytoplasm, nucleus, and in the ribosome.\t |
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| 6399. |
Types of roots. With example |
| Answer» There are three types of root system, viz. tap root system, fibrous root system and adventitious root system.\tTap Root System:\xa0This type of root system is mainly present in dicotyledonous plants. Direct elongation of the radicle results in formation of primary root. The primary root bears secondary, tertiary, etc. roots. The primary root; along with its branches; makes the tap root system, e.g. mustard, banyan, etc.\tFibrous Root System:\xa0This type of root system is mainly present in monocotyledonous plants. The primary root is short lived after germination. This is replaced by a large number of roots and all of them emerge from the base of the stem. Such roots constitute the fibrous root system, e.g. wheat, paddy, grass, etc.\tAdventitious Roots:\xa0Sometimes, roots arise from some other plant parts (other than radicle). Such roots are called adventitious roots. Adventitious roots are used for various purposes; like vegetative propagation, mechanical support, etc. | |
| 6400. |
Explain the process of blood coagulation |
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Answer» The clotting of blood in the surface of injury to prevent the blood loss . \tBlood coagulation or clotting is the mechanism to prevent excessive loss of blood from the body.\tReddish brown scum formed at the site of a cut is due to clot formed mainly of a network of threads called\xa0fibrins\xa0in which dead and damaged formed elements of blood are trapped.\tFibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.\tThrombins are formed from another inactive substance present in the plasma called\xa0prothrombin\xa0by an enzyme complex known as\xa0thrombokinase.\tCalcium ions play a very important role in clotting. Coagulation is also known as clotting. It is the process by which blood changes from a liquid to get a gel, forming a blood clot. It potentially results in hemostasis, the cessation of blood loss from a damaged vessel, followed by repair. The mechanism of coagulation involves activation, adhesion, aggregation of platelets, as well as deposition and maturation of fibrin. |
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