24277 + Interview Questions in Biology in Class 12 Page 64 InterviewSolution

3151.	Question : What are autosomes? How many autosomes would be found in the normal liver cells of a human female?
Answer» Solution :The chromosomes other than the SEX chromosomes in the GENOME, 22 pairs of AUTOSOMES

Discussion

3152.	Question :What are attenuated recombinant vaccines?
Answer» Solution :Attenuated recombinant VACCINES includes GENETICALLY modified pathogenic organisms (bacteria or viruses) that are MADE nonpathogenic and are used as vaccines. Such vaccines are referred to as attenuated recombinant vaccines.

Discussion

3153.	Question : What are ascaricides? Give examples of the same.
Answer» SOLUTION :Ascaricides are pharmaceutical DRUGS that are used for KILLING parasitic ROUNDWORMS, e.g. Menbendazole and albendazole, etc.

Discussion

3154.	Question :What are assisted reproductive technologies (ART) ? Give its importance and which methods come under it?
Answer» Solution : Certain special techniques commonly known as Assisted Reproductive Technologies. (ART) through that couple can have children. (i) IVF - In Vitro Fertilization : (IVF) Fertilization outside the body followed by embryo transfer (ET) is one of such methods. In this method is popularly known as test tube baby programme. In this, ova from the wife / donor (female) and sperms from the husband / donor (male) are collected and are induced to form zygote under simulated conditions in the laboratory The zygote or early embryos (with upto 8 blastomeres) could then be transferred into the fallopian tube. This is also called ZIFT - Zygote Intra Fallopian Transfer Embryos with more than 8 blastomeres is tranferred into the uterus (IUT - Intra Uterine Transfer) to complete its further development. Embryos formed by in-vivo fertilization (FUSION of gametes within the female) also could be used for such transfer to assist those females who cannot conceive. (ii) GIFT : Transfer of an ovum collected from a donor into the fallopian tube (GIFT. Gamet Intra Fallopian Transfer) of another female who cannot produce one but can provide suitable environment for fertilization and further development is another method attempted. In this method, ovum is TAKEN from donor and transferred into fallopian tube of a female. (iii) Al : Another specialized procedure to form an embryo in the laboratory is called intra cytoplasmic sperm injection in which a sperm is directly injected into the ovum. Infertility CASES either due to inability of the male partner to inseminate the female or due to very low sperm counts in the ejaculates could be corrected by artificial Insemination. In this technique the semen is collected either from the husband or a healthy donor is artificially introduced either into the vagina or into the uterus (IUI. Intra uterine insemination) of the female. All these techniques require extremely high precision handing by specialized professionals. Legal adoption is one of the best methods for couples looking for parenthood.

Discussion

3155.	Question : What areantipodals ?
Answer» SOLUTION :the threecellsat the chalazalend of a ovulearecalledantipodals

Discussion

3156.	Question : What are anticodons?
Answer» Solution :In TRNA sequence of three BASES which is complementary to CODONS of mRNA are called ANTICODON. The codons of mRNA are recognized by the anticodons of tRNA.

Discussion

3157.	Question : What are antibiotics?
Answer» SOLUTION :Anitibiotics are CHEMICAL substance produced by MICROORGANISMS which cankill or retard the growth of DISEASE causing microbes even in low CONCENTRATION Antibiotic means against life..

Discussion

3158.	Question : Whatare analogousorgans ? Give an examplein plants .
Answer» Solution :Theorganswhose structure and origin are different butperformingsimilarfunction. EX : In plantssweet potato (root modification) and potato (STEM modification).

Discussion

3159.	Question :What are analogous organs? Give an example.
Answer» Solution :Organisms not having anatomically SIMILAR structures through they perform similar functions are called analogous organs. EG: (i) Wings of butterfly and wings of birds. (ii) Eye of octopus and of mammals. (III) Flippers of penguins and Dolphins. (iv) SWEET potato (ROOT modification) and potato (stem modification).

Discussion

3160.	Question : What are analogous organs? Give an example in animals.
Answer» Solution :These are ORGANS which are different in origin and anatomy but perform similar functions. Ex: EYES of octopus and MAMMALS Flippers of PENGUINS and Dolphins

Discussion

3161.	Question : What are algal blooms? How are they formed? Give the harmful effects of formation of algal blooms in an aquatic body.
Answer» Solution :Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of ALGAE (free floating) CALLED algal bloom. The harmful effects: (i) Deterioration of water quality and IMBALANCE of water ecosystem. (ii) Fish MORTALITY rate increases. (III) Some bloom forming algae are extremely toxic to human beings and animals.

Discussion

3162.	Question : What are all the chances of colour blind daughters and sons being born in a marriage of normal man marrying a normal woman whose father was colour blind ?
Answer» All sons are NORMAL and all daughters are COLOUR blind Both the sons and DAUGHTER PHENOTYPICALLY normal All the sons are colour blind and all daughters are normal 50 %sons arecolourblindand alldaughtersare phenotypicallynormal Solution :50 %sons arecolourblindand alldaughtersare phenotypicallynormal

Discussion

3163.	Question : What are all the chances of colour blind daughters and sons being born in a marriage of normal man marrying a normal woman whose father was colour blind?
Answer» All SONS are NORMAL and all daughters are COLOUR BLIND Both the sons and daughters are phenotypically normal 50% sons are colour blind and all daughters are normal Both the sons and daughters are colour blind

Discussion

3164.	Question : What are aims of seed bank from the following ?
Answer» CONSERVATION of diversity. Seed has to be stored for many years, with a minimum LOSS of viability. Many FOREST and fruit species for STORAGE. All given Solution :All given

Discussion

3165.	Question : What are Agro-chemicals and mention their effects ?
Answer» SOLUTION :Use of inorganic fertilizers and PESTICIDES has been increased manifold due to green revolution for enhancing crop production. The pesticides and insecticides are TOXIC to non-target ORGANISMS that are important components of the soil ecosystem. They are biomagnified in the TERRESTRIAL ecosystem and also causes eutrophication in aquatic ecosystems.

Discussion

3166.	Question : What are agrochemicals?
Answer» Solution :Chemicals which are USED in AGRICULTURE for growth of plants and PEST CONTROL are CALLED agrochemicals or agrichemicals.

Discussion

3167.	Question : What are adaptations ? Discess any four adaptations found in plants and animals.
Answer» Solution :Any attribute of the organism (morphological ,physiological or behavioral) that enables the organism to survive and reproduce in its habitat is called adaptation. Many adaptations have evolved over a long evolutionary time and are genetically controlled its survival. Some of the examples of adaptations are given below: (a) In the absence of external water, the kangraoo rat in North Amercian desserts is capable of MEETING all its water requirements through its internal fat oxidation ,in which water is a by product. Also it can concentrate its urine to minimal volume . (b) Mammals living in colder climates have shortes ears and limbs to minimize of heatloss .This is called Allen 's Rule . heat. (c) Aquatic mammals like seals living in polar seas have a thick layer of fat (Blubber ) below their skin that ACTS as an insulator and reduces loss of body heat.(d) Fishes thriving in Antartic waters where the temperature us below zero degrees ,have an array of biochemical adaptations to such extreme environments. (e) Dessert plants POSSES the following adaptations:1 Thick cuticule on their leaf surface. 2 Posses sunken stomata. 3 They have a special photosynthesis pathway i.e ., CAM pathway that enables their stonata to remain closed during day time . 4 In opuntita, the leaves are reudced to spines and the photosynthetic function are taken over by the flatted stems, (f) Archaebacteria have adapations to survive at temperatures more than 100@C. (g) When human beings go from plants to high altitudes (>350m) [e.g : Rohtang pass] they experience altitude sickness,due to the LOW atmoshpheric pressure and reduced oxygen availability. They develop symptoms like fatigue, nausea and heart palpitations . But graudually the body gets adjusted by increasing red BLOOD cell production, decrasing bind capacity of haemoglobin and increasing the breathing rate.

Discussion

3168.	Question : What accounts for the greater ecological diversity of India ?
Answer» Solution :India with its deserts, rain forests, mangroves, coral reefs, wetlands, ESTUARIES and ALPINE MEADOWS has a greater ecosystem DIVERSITY.

Discussion

3169.	Question : What is the common passage for urine and genital products in males called?
Answer» ANSWER :URETHRA

Discussion

3170.	Question : Whale washed ashore will die because of
Answer» INCREASE in BODY temperature Incapability to breathe Crushing of BONES under body weight Cracking skin Answer :C

Discussion

3171.	Question : Whales belong to class________.
Answer» ANSWER :MAMMALIA,

Discussion

3172.	Question : Wha are the basic layer of the walls of the alimentary canal?
Answer» ANSWER :SEROSA, MUSCULARIS, SUBMUCOSA, MUCOSA

Discussion

3173.	Question : Western Ghats of India is hot spot, because :
Answer» It is a ECOTONE in TWO community It is a mega diversity zone It is a WARM places It is a HYDROTHERMAL vents Answer :B

Discussion

3174.	Question : Wernicksarea are concerned with ____.
Answer» ANSWER :HEARING or AUDITORY

Discussion

3175.	Question : Wernicke's (posterior language) ara is located in
Answer» right TEMPORAL and parietal LOBES left temporal and parietal lobes OCCIPITAL lobes FRONTAL lobes Answer :B

Discussion

3176.	Question : Wenckebach phenomenon is seen in
Answer» COMPLETE heart BLOCK partial heart block venriicular fibrillation myocardial INFARCTION ANSWER :B

Discussion

3177.	Question : Welcome Trust is a charity organisation of_______
Answer» ANSWER :U.K.

Discussion

3178.	Question :Weedicides used in the crop fields kill the weeks by
Answer» PREVENTING ELECTRON transport in respiration Preventing dark phase in photosynthesis Preventing light ABSORPTION by pigment Preventing electron transfer in THYLAKOID MEMBRANE (or) in light phase Answer :D

Discussion

3179.	Question : Weatherings of rocks makes phosphorus available to
Answer» Decomposers Consumers Producers All of the above Answer :C

Discussion

3180.	Question : We sometimes find the existence of following structures in human beings : (i)occurrence of short tail in some babies (ii)presence of additional mammae in two rows down the front of the body of some persons (iii)power of moving pinna, (iv)presence of very long and dense hair on the body Why does this happen in such persons? Also , name the phenomenon involved
Answer» Solution :The appearance of above characters in some PERSONS can be eplained on the assumption that there is a tendency among the ANIMALS INCLUDING human beings to develop structures that were present in their remote ancestors . The phenomenon involved in called atavism (i.e., the reappearance of CERTAIN ANCESTRAL, not parental, structure(s) which has/have either completely disappeared or greatly reduced )

Discussion

3181.	Question : We sometimes find the existence of following structures in human beings: (a) Occurrence of short tail in some babies (b) Presence of additional mammae in two rows down the front of the body of some persons (c) Power of moving pinna, or (d) Presence of very long and dense hair on the body. Why does this happen in some persons? Also, name the phenomenon involved.
Answer» Solution :The appearance of above characters in some PERSONS is DUE to the phenomenon of atavism (i.e., the reappearance of certain ancestral, not PARENTAL, structure(s) which has/have EITHER completely disappeared or greatly REDUCED).

Discussion

3182.	Question :We should care about loss in biodiversity in the populations of other species because of :
Answer» POTENTIAL loss of medicinal plants and other products yet undiscovered from THREATENED species Potential loss of genes , some of which may code for proteins useful to humans The risk of global ECOLOGICAL INSTABILITY All of the above options are correct Answer :D

Discussion

3183.	Question : A compound "X" has molecular formula C_5H_(9) Cl. It does not react with bromine in C Cl_4. On treatment with strong base it produces single compound "Y" (C_5H_8) and reacts with Br_(2)(aq). Ozonolysis of "Y" produces a compound C_5H_(8)O_2. The structure of X is
Answer» RESERPINE which causes hypotension cardiac glycosides which are toxic morphine which is HYPNOTIC and sedative Answer :C

Discussion

3184.	Question : We move our hands while walking for
Answer» FASTER movement Balancing INCREASING BLOOD circulation Relieving tension Answer :B

Discussion

3185.	Question : We have moral responsibilities to take good care of earth's biodiversity and pass in good order to next generation. Name two types of biodiversity conservation.
Answer» SOLUTION :In SITU CONSERVATION and Ex-situ conservation.

Discussion

3186.	Question : We heard of the slogans ''we two have two'' and ''one family one tree''. Give the importance of these slogans according to your views.
Answer» Solution :.We two have two.. In 1947, at the time of partition, the population of India, Pakistan and Sri Lanka was 53 crore. At present, the population of India alone is 105 crore. If the present growth continues, in the very near future man will face the scarcity for food, housing, DRINKING water and other BASIC necessities. So we must follow the GOVERNMENT policy .we two have two.. China has passed a strict law that there will be one child from one couple. Anybody having second child pays tax to the government for 18 years. Is it not possible that this law is to be passed in India also? One family one tree The TARGET for 2007 is atleast 100 million trees. The ultimate aim is to create awareness and DEVELOP public knowledge and involvement. So 100 million trees are planted every year.

Discussion

3187.	Question : We havegot used to associatingloud soundswith pleasure andentertaimentnot realisingthatnoise causepsychological andphysiologcal disorders in humans . Comment on thevariousill effectss of noisein human .
Answer» SOLUTION :i. A brief exposureto extremely high sound LEVEL 150 dB or more maydamageear eardrums. ii. Chronicexposureto a relativelylowernoiselevelof CITIES may permanently and stress. iii.Noisealso causes sleeplessness, increased heart BEATING ,altered breathing pattern and stress.

Discussion

3188.	Question : We have moral responsibilities to take good care of earth's biodiversity and pass it on in good order to next generation. Define biodiversity
Answer» Solution :Biodiversity or Biological DIVERSITY MEANS the variety of life forms-Occurrence of different type of GENES,SPECIES and ecosystem in a REGION.

Discussion

3189.	Question : We have moral responsibilities to take good care of earth's biodiversity and pass in good order to next genration.Write causes for biodiversity losses.
Answer» SOLUTION :HABITAL loss and FRAGMENTATION,over exploitation,alien SPECIES INVASION and co-extinction

Discussion

3190.	Question : We employ antibiotics or drugs against eukaryotic organisms/cells. Hence, resistant organisms/cells are appearing in a time scale of months or years and not centuries. These are example of evolution due to
Answer» ANSWER :ANTHROPOGENIC -ACTION

Discussion

3191.	Question : We can produce concentrated/dilute urine, This is facilitated by a special mechanism. Identify the mechanism
Answer» Reabsorption from PCT Reabsorption from COLLECTING Duct Reabsorption/Secretion in DCT Counter CURRENT mechanism in Henle's loop/Vasa recta Answer :D

Discussion

3192.	Question : We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer.
Answer» Solution :Yes, human is also evolving. Fossils GIVE the evidences that evolution is a continuous phenomenon. Our ancestors like Ramapithecus, Australopithecus, Homo HABILIS, Homo erectus, Neanderthal man and Cro-magnon man continuously evolving and modem man (Homo sapiens sapiens) arises from certain modifications. About 15mya Dryopithecus and Ramapithecus were existing. They were hairy and walked like gorillas and chimpanzees. Ramapithecus was more man-like while Dryopithecus was more ape like. 2mya Australopithecines probably lived East African grasslands, they ate fruits. They have ape like characters like-small stature, large incisors,supraorbital ridges and chinless. They have man like characters like-erctposture, bipedal, lumbar curve etc. Homo habilis is the first human -like being the Hominid. The brain capacity of him were between 650- 800cc. They probably did not eat meat. They showed Bipedal, erect POSTURE. They are first tool maker(Handy man). Fossils discoveredin Java in 1891 revealed next stage Le Homo erectus about 1.5mya. They had large brain and 900 cc. They probably ate meat. They first used fire. They were chinless. Neanderthal man is with brain capacity 1400cc. They lived near east and central Asia between 1,00,000-40,000 years back. They used hides to protect. their body and buried their dead. They were cave dwellers. Homo sapiens arose 75,000-10,000 years ago during ice age. Pe-historic cave art developed about 18,000 years ago. They have flat forhead,chin is present,no supra-orbital ridge erect posture. So we can say that evolution is continuing phenomenon EVEN in man.

Discussion

3193.	Question : W.B.Cs contain haemoglobin.true or false
Answer» ANSWER :RBC's

Discussion

3194.	Question : W.B.Cs transport O_2.
Answer» True False Answer :R.B.Cs

Discussion

3195.	Question : WBC,PMNL monocytes and natural killer cells are then examples of
Answer» PHYSICAL Barriers Physiological Barrier Cellular barrier Cytokine barriers Answer :C

Discussion

3196.	Question : Wavelength of light that carries out photosynthesis in bacteria is
Answer» BLUE RED Ultraviolet Near INFRA red or far red ANSWER :D

Discussion

3197.	Question : Wavelength of light responsible for Emerson's enhancement effect :
Answer» only `680 nm UARR` only `680 nm darr` infra RED wavelength Both `680 nm uarr and 680 nm darr` ANSWER :D

Discussion

3198.	Question : Watson and Crick suggested the copying mechanism for DNA wherein the two strands separate and act as template for the synthesis of new complementary strands. Centrifugal force and the use of isotopes helped to prove the mechanism of replication in E. coli. Explain how it has helped.
Answer» Solution :(Explanation of MESELSON Stahl.s experiment) E.coli GROWN in medium CONTAINING `""^15NH_4Cl`for MANY generations to get `""^15N`incorporated into newly synthesised DNA, then cells transferred into 14NHACI, extracted DNA are centrifuged in CsCl and measured to get their densities, DNA extracted from the culture after one generation/20 minutes, showed intermediate/hybrid density, DNA extracted after two generations/40 minutes showed light DNA and hybrid DNA

Discussion

3199.	Question : Watson and Crick suggested the copying mechanism for DNA wherein the two strands separate and act as template for the synthesis of new complementary strands. With a suitable diagram, show the replication of DNA that occurs within a small opening of DNA helix.
Answer» SOLUTION :DIAGRAM of REPLICATION FORK formed during DNA replication

Discussion

3200.	Question : Watson and Crick proposed their double helical DNA model based on the X-ray diffraction analysis of ……………..
Answer» ERWIN Chargaff Meselson and Stahl WILKINS and FRANKLIN Griffith Solution :Wilkins and Franklin

Discussion

Explore topic-wise InterviewSolutions in .

Question : What are autosomes? How many autosomes would be found in the normal liver cells of a human female?

Question :What are attenuated recombinant vaccines?

Question : What are ascaricides? Give examples of the same.

Question :What are assisted reproductive technologies (ART) ? Give its importance and which methods come under it?

Question : What areantipodals ?

Question : What are anticodons?

Question : What are antibiotics?

Question : Whatare analogousorgans ? Give an examplein plants .

Question :What are analogous organs? Give an example.

Question : What are analogous organs? Give an example in animals.

Question : What are algal blooms? How are they formed? Give the harmful effects of formation of algal blooms in an aquatic body.

Question : What are all the chances of colour blind daughters and sons being born in a marriage of normal man marrying a normal woman whose father was colour blind ?

Question : What are all the chances of colour blind daughters and sons being born in a marriage of normal man marrying a normal woman whose father was colour blind?

Question : What are aims of seed bank from the following ?

Question : What are Agro-chemicals and mention their effects ?

Question : What are agrochemicals?

Question : What are adaptations ? Discess any four adaptations found in plants and animals.

Question : What accounts for the greater ecological diversity of India ?

Question : What is the common passage for urine and genital products in males called?

Question : Whale washed ashore will die because of

Question : Whales belong to class________.

Question : Wha are the basic layer of the walls of the alimentary canal?

Question : Western Ghats of India is hot spot, because :

Question : Wernicksarea are concerned with ____.

Question : Wernicke's (posterior language) ara is located in

Question : Wenckebach phenomenon is seen in

Question : Welcome Trust is a charity organisation of_______

Question :Weedicides used in the crop fields kill the weeks by

Question : Weatherings of rocks makes phosphorus available to

Question :We should care about loss in biodiversity in the populations of other species because of :

Question : A compound "X" has molecular formula C_5H_(9) Cl. It does not react with bromine in C Cl_4. On treatment with strong base it produces single compound "Y" (C_5H_8) and reacts with Br_(2)(aq). Ozonolysis of "Y" produces a compound C_5H_(8)O_2. The structure of X is

Question : We move our hands while walking for

Question : We have moral responsibilities to take good care of earth's biodiversity and pass in good order to next generation. Name two types of biodiversity conservation.

Question : We heard of the slogans ''we two have two'' and ''one family one tree''. Give the importance of these slogans according to your views.

Question : We havegot used to associatingloud soundswith pleasure andentertaimentnot realisingthatnoise causepsychological andphysiologcal disorders in humans . Comment on thevariousill effectss of noisein human .

Question : We have moral responsibilities to take good care of earth's biodiversity and pass it on in good order to next generation. Define biodiversity

Question : We have moral responsibilities to take good care of earth's biodiversity and pass in good order to next genration.Write causes for biodiversity losses.

Question : We employ antibiotics or drugs against eukaryotic organisms/cells. Hence, resistant organisms/cells are appearing in a time scale of months or years and not centuries. These are example of evolution due to

Question : We can produce concentrated/dilute urine, This is facilitated by a special mechanism. Identify the mechanism

Question : We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer.

Question : W.B.Cs contain haemoglobin.true or false

Question : W.B.Cs transport O_2.

Question : WBC,PMNL monocytes and natural killer cells are then examples of

Question : Wavelength of light that carries out photosynthesis in bacteria is

Question : Wavelength of light responsible for Emerson's enhancement effect :

Question : Watson and Crick suggested the copying mechanism for DNA wherein the two strands separate and act as template for the synthesis of new complementary strands. Centrifugal force and the use of isotopes helped to prove the mechanism of replication in E. coli. Explain how it has helped.

Question : Watson and Crick suggested the copying mechanism for DNA wherein the two strands separate and act as template for the synthesis of new complementary strands. With a suitable diagram, show the replication of DNA that occurs within a small opening of DNA helix.

Question : Watson and Crick proposed their double helical DNA model based on the X-ray diffraction analysis of ……………..