24277 + Interview Questions in Biology in Class 12 Page 479 InterviewSolution

23901.	Question : A boy has been diagnosed with ADA deficiency. Suggest any one possible treatment.
Answer» SOLUTION :GENE THERAPY

Discussion

23902.	Question : Aboy of ten years had suffered from chicken-pox .His grand mother consoled him that he is not expected to have it for rest of his life.Whether his grandmother is right ?If so how it happens?
Answer» Solution :The INFECTION produces not only antobodies but also generates MEMORY in the lymphocytes.These cells RECOGNIZE the pathgone on subsequent attack and generate antibodies to neutralize the pathogen,so his grandmother is RIGHT and the boy will not get the DISEASE for rest of his life.

Discussion

23903.	Question : A bone that is formed within the mesenchyme is called
Answer» Endochondral BONE Replacing bone Sesamoid bone Dermal bone ANSWER :D

Discussion

23904.	Question : A blue fowl was obtained after crossing between a white and black fowl. Than the ratio of their F_2 generation will be
Answer» `3:1` `9:2` `1:2:1` `13 : 3 ` SOLUTION :`3:1`

Discussion

23905.	Question : A black hybrid mouse is crossed with a pure brown mouse to produce a total of 24 young ones. Which of the following result is most likely to be correct?
Answer» 13 black males and 11 black females 11 BROWN males and 13 brown females 8 black males, 10 black females, 3 brown males, 3 brown females 5 black males, 6 brown males, 7 black females, 6 brown females Answer :D

Discussion

23906.	Question : A bivalent of prophase I represent
Answer» One CENTROMERE with TWO chromatids Two CENTROMERES with two chromatids Two centromere with FOUR chromatids Four centromere with four chromatids Answer :C

Discussion

23907.	Question : A bisexual self pollinating flowering plant has chromosome number 76 in its somatic cells. What is the advantage of cross pollination over self pollination ?
Answer» Solution :SEXUAL REPRODUCTION brings about genetic recombination and results in the better Survival of SPECIES.

Discussion

23908.	Question : a bird introduced from another country become a serious pest due to
Answer» BETTER ADAPTATION to new area most SEXUAL reproduction better nesting habitats absence of natural COMPETITION ANSWER :D

Discussion

23909.	Question : A biologist studied the population of rats in a barn . He found that the average natality was 250 , average mortality 240 , immigration 20 and emigration 30. The net increase in population is :
Answer» 15 5 zero 10 Answer :C

Discussion

23910.	Question : A biologist studied the population of rats in a barn. He found that average natality was 250 average mortality 240, immigration 20, and emigration 30. The net increase in population is
Answer» `10` `15` `05` ZERO ANSWER :D

Discussion

23911.	Question : A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is
Answer» `10` `15` `05` ZERO ANSWER :D

Discussion

23912.	Question : A biologist studies the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :
Answer» 10 15 5 zero Answer :D

Discussion

23913.	Question : A: Biological magnification means increasing concentration of some toxic substance at various trophic levels of a food chain of organisms. R: Concentration of DDT water is 0.003 ppm.
Answer» Both ASSERTION and Reason are TRUE and Reason is a correct explanation of the Assertion. Both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. Assertion is true but Reason is FALSE. Assertion is false but Reason is true. Answer :C

Discussion

23914.	Question : A biogeographicregion with significant reservoir of biodiversity that is underthreat from humansis called as
Answer» bioendangered region BIODIVERSITY HOTSPOT biodiversity reservoir environmentally endangeredregion SOLUTION :A biogeographicregion with significant reservoir of biodiversity that is under threat from HUMANS is CALLEDAS biodiversity hotspot.

Discussion

23915.	Question : A biological control being developed for use in treatment of plant diseases is Trichoderma. It is a:
Answer» Free-living fungus Parasitic bacteria Symbiotic fungus Baculovirus Answer :A

Discussion

23916.	Question : A biogenesis theory states that?
Answer» Life origanted due to spontaneous generation Origin of the life is due to preexisting organisms Origin of the life occurred from blue -green algae LIKE microorganisms Origin of the life is due to organic evolution OWING to chemical reactions in presence of light Solution :A biogenes theory of origin of life stated that DIFFERENT types of organisms are FORMED automatically due to chemical reactions in presence of high energy . The spontaneous gnenration or abiogenesis of life was visualized as beginning with either inorganic MATERIALS or with puterfying organic matter.

Discussion

23917.	Question : A biofertilizer is:
Answer» farmyard manure consisting of mixture of cattle dung and crop residues green manure in which a quick growing crop is CULTIVATED and ploughed under a cyanobacterium like Anabaena sp. LIVING in cavities of Azolla leaves symbiotic bacteria like Azotobacter which fix atmospheric nitrogen Answer :C

Discussion

23918.	Question : A : Biodiversity of the prokaryotes cannot be estimated. R : Conventional taxonomic methods are not suitable for identification and characterisation of microbes.
Answer» If both Assertion & Reason are true and the reason is the correct explanation OD the assertion, then mark(1) If both Assertion & Reason are true but the reason is not the correct expanation of the assertion, then mark (2) If Assertion is true STATEMENTS but Reason is FALSE, then mark (3) If both Assertion and Reason are false statements, then mark(4). Answer :A

Discussion

23919.	Question : A biochip can be used for
Answer» DETECTION of communicable DISEASES screening of gene PROFILES PALAENTOLOGY All of the above Answer :B

Discussion

23920.	Question : A bilobeddithecus anther has 100 microscope mother cells per micro sporangium. How many male gametophytes this anther can produce?
Answer» ANSWER :A::D

Discussion

23921.	Question :A beneficial association which is necessary for survival of both partners is called :
Answer» SYMBIOSIS Commensalism Mutualism Both A and C Answer :C

Discussion

23922.	Question : A beast of burden which needs little care is
Answer» pig DONKEY mule YAK Answer :B

Discussion

23923.	Question : A bee-hive near the farm/field is advantageous for a farmer.
Answer» Solution :Abee hive NEAR the farm/field is advantageous for a farmer because a farmer can obtain both honey and wax from the bee-hive, which is useful ECONOMICALLY. HONEYBEES do POLLINATION in many crops. Thus if a bee-hive near the farm/field is advantageous for a farmer.

Discussion

23924.	Question : A, B,D are three independently assorting genes with their recessive alleles a, b, d respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Explain the type of genotypes of the offspring produced.
Answer» Solution :The given cross is Aa bb DD X aa bb dd ACCORDINGLY the type of offspring produced WOULD be

Discussion

23925.	Question : [A]: Basis of adaptation is the preexisting gene mutation.[R]: In changed environment, a hidden gene mutation may express and result in survival of the organisms and finally lead to adapta- tion to new conditions.
Answer» If both A and R are true and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false Answer :A

Discussion

23926.	Question : A baloon fruit is
Answer» HOPEA Dipterocarpus Colutea ALSTONIA ANSWER :C

Discussion

23927.	Question : A bacterium having rDNA formed by using pBR322 and EcoRI restriction enzyme is resistant to :
Answer» PENICILLIN and ampicillin Ampicillin and tetracycline Tetracycline only Ampicilin only Answer :B

Discussion

23928.	Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(c) how man has exploited this protrin for his benefit?
Answer» Answer :SPECIFIC Bt TOXIN genes isolated from bacillus thuringiensis and incorporated into several crop plants such as cotton and which BECOME PEST resistant against certain insects

Discussion

23929.	Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(b) What type of changes occur in thegut of insects on consuming this protein?
Answer» Answer :prototoxin BECOMES ACTIVE toxin in ALKALINE pH of gut of insects TOXINS bind to surface of midgut and cause perforation swelling lysis of CELLS ultimately leading to death of insect.

Discussion

23930.	Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(a) Why this toxic does not kill the bacteria?
Answer» ANSWER :in bacteria, CRY protein REMAINS in inactive from as prototoxin.

Discussion

23931.	Question :A bacteriophage with radioactive DNA and protein when infects a bacterium the radioactivity inside the bacterium will be located :
Answer» In DNA In PROTEIN Both DNA protein In ALLPARTS of BACTERIAL cell Answer :A

Discussion

23932.	Question : A bacterial infection was effectively controlled by using a specific antibiotic for a long time. But nowadays this antibiotic is not found to be so effective to control the said infection .Give a scientific explanation for this phenomenon based on evolution.
Answer» SOLUTION :A specific ANTIBIOTIC when first INTRODUCED is most effective in DESTROYING bacterial INFECTION. Then bacteria develop resistance to the antibiotic . This is an example for anthropogenic evolution.

Discussion

23933.	Question : A bacterial cell was transformed with a recombinant DNA molecule that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be
Answer» Human gene may have INTRON which BACTERIA cannot process Amino acid CODONS for humans and bacteria are different Human protein is formed but degraded by bacteria All of the above. SOLUTION :Human gene may have intron which bacteria cannot process A bacterial cell was transformed with a recombinant DNA that was GENERATED using a human gene. However, the transformed cells did not produce the desired protein because human gene may have intron which bacteria cannot process.

Discussion

23934.	Question : (A) bacterial cell is shown in the figure given below,lable the part (A) and
Answer» SOLUTION :(A)-PLASMID

Discussion

23935.	Question : Write the role of Phosphorous in plants
Answer»

Discussion

23936.	Question : A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that boy had twenty teeth. Which teeth were absent ?
Answer» INCISORS Canines Pre-molars Molars ANSWER :C

Discussion

23937.	Question : A, B, D are three independently assorting genes with their recessive alleles a, b, d, respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Find out the type of genotypes of the offspring produced.
Answer» Solution :The given cross is Aa bb dd `xx` aa bb dd. ACCORDINGLY the type of offspring produced WOULD.

Discussion

23938.	Question : A B CC B D E F G H I From the above figure identify the type of mutation and explain it.
Answer» SOLUTION :In reverse TANDEM DUPLICATION, the duplicated segment is LOCATED IMMEDIATELY after the normal segment but the gene sequence other will be reversed.

Discussion

23939.	Question : A B C C B D E F G H I From the above figure identify the type of mutation and explain it.
Answer» Solution :In reverse tandem duplication , the DUPLICATED segment is LOCATED IMMEDIATELY after the NORMAL segment but the gene sequence other will be reversed.

Discussion

23940.	Question : [A]: At any given CO_2 tension, reduced blood takes up larger amount of CO_2 than oxygenated blood.[R]: Oxygenation of blood causes evolution of CO_2 in lungs.
Answer» If both A and R are TRUE and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false Answer :A

Discussion

23941.	Question : A: As the amount of dissolved oxygen in water decreases, BOD increases. R: Microorganisms involved in biodegradation of organic matter requires a lot of dissolved O_(2).
Answer» A. Both ASSERTION and REASON are true and Reason is a correct EXPLANATION of the Assertion. B. Both Assertion and Reason are true but Reason is not a correct explanation of the Assertion C. Assertion is true but Reason is false. D. Assertion is false but Reason is true. Answer :A

Discussion

23942.	Question : [A]: Artitical selection is done only in animal breeding.[R]: Artifical selection is done in animal breeding only.
Answer» If both A and R are TRUE and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false Answer :D

Discussion

23943.	Question : A and C are vertebrate groups having a varied number of species globally . Select the correct option.
Answer» `{:(A,C),("FISHES","Birds"):}` `{:(A,C),("Birds","MAMMALS"):}` `{:(A,C),("REPTILES","Birds"):}` `{:(A,C),("Fishes","Mammals"):}` ANSWER :A

Discussion

23944.	Question : A and B chains are found in
Answer» INSULIN INTERFERON SOMATOTROPIN RABIES vaccine Solution :Insulin

Discussion

23945.	Question : a. Amphibians and reptiles have a 3 chambered heart with ___atria and ___ventricle. b. heart is ___derived organ and protected by a double walled membranous bag called____ c. The opening between right Atrium and Right ventricle is guarded by a valve formed of ___muscular flaps, the ___valve. d. The wall of ventricle is ____than atria. e. SAN can generate the maximum number of action potential i.e., ____ mi n^(-1). therefore it is called_____ f Atrial systole increases the flow of lood into the ventricles by about ____percent. g. In____ all the four chambers of the heart are in a relax state. h. the ____wave represents the depolarisation of the atria. i. A system of blood vessels is present in our body exlusively for the circulation of blood to and from the cardiac musculature called_____ j. PNA____ the rate of heart beat and______
Answer» Answer :a. 2,1 b. Mesodermal,Pericardium c. 3,TRICUSPID d. Thicker. e. 72, PACEMAKER F. 30% g. Joint diastole h. P i. Coronary j. Decrease, Cardiac OUTPUT

Discussion

23946.	Question : A' and 'B' are the male & female sex cells respectively which look alike and performs similar functions. 'A' and 'B' fuse to form a new individual 'D'. Which type of gametic fusion does this represent? Give an example.
Answer» SOLUTION :ISOGAMY. E.g: MONOCYSTIS

Discussion

23947.	Question : A: Anatropous ovule is resupinate ovule R: The body of ovule is completely bent with hilum close to micropyalr end
Answer» if both assetion A reason are TURE and the reason is the CORRECT explanation of the assertion then MARK if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark if assertion is true statement but reason is false then mark if both assertion and reason are flase statements then mark ANSWER :A

Discussion

23948.	Question : [A] : All body cells continuously obtain useful material from, and dispose of their waste products into the external fluid medium. This is mainly maintained as a constancy and is termed excretion. [R]: This is achieved by constant disposal or excretion of all waste products and refuse, as well as, useless materials from body into ex- ternal environments.
Answer» If both A and R are TRUE and R is the CORRECT explanation of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false Answer :D

Discussion

23949.	Question : (a) Alpine-scrub - 2900 m - 3500 m (b) Sub-Alpine forests - 4000 m - 5000 m (c) Rolling grassland - Shola (d) Higher altitude grasslands - Above 2000 m
Answer» ANSWER :ROLLING GRASSLAND - Shola

Discussion

23950.	Question : [A]: Albumin is associated with oedema.[R]: It is produced by liver.
Answer» If both A and R are true and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false ANSWER :B

Discussion

Explore topic-wise InterviewSolutions in .

Question : A boy has been diagnosed with ADA deficiency. Suggest any one possible treatment.

Question : Aboy of ten years had suffered from chicken-pox .His grand mother consoled him that he is not expected to have it for rest of his life.Whether his grandmother is right ?If so how it happens?

Question : A bone that is formed within the mesenchyme is called

Question : A blue fowl was obtained after crossing between a white and black fowl. Than the ratio of their F_2 generation will be

Question : A black hybrid mouse is crossed with a pure brown mouse to produce a total of 24 young ones. Which of the following result is most likely to be correct?

Question : A bivalent of prophase I represent

Question : A bisexual self pollinating flowering plant has chromosome number 76 in its somatic cells. What is the advantage of cross pollination over self pollination ?

Question : a bird introduced from another country become a serious pest due to

Question : A biologist studied the population of rats in a barn . He found that the average natality was 250 , average mortality 240 , immigration 20 and emigration 30. The net increase in population is :

Question : A biologist studied the population of rats in a barn. He found that average natality was 250 average mortality 240, immigration 20, and emigration 30. The net increase in population is

Question : A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is

Question : A biologist studies the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

Question : A: Biological magnification means increasing concentration of some toxic substance at various trophic levels of a food chain of organisms. R: Concentration of DDT water is 0.003 ppm.

Question : A biogeographicregion with significant reservoir of biodiversity that is underthreat from humansis called as

Question : A biological control being developed for use in treatment of plant diseases is Trichoderma. It is a:

Question : A biogenesis theory states that?

Question : A biofertilizer is:

Question : A : Biodiversity of the prokaryotes cannot be estimated. R : Conventional taxonomic methods are not suitable for identification and characterisation of microbes.

Question : A biochip can be used for

Question : A bilobeddithecus anther has 100 microscope mother cells per micro sporangium. How many male gametophytes this anther can produce?

Question :A beneficial association which is necessary for survival of both partners is called :

Question : A beast of burden which needs little care is

Question : A bee-hive near the farm/field is advantageous for a farmer.

Question : A, B,D are three independently assorting genes with their recessive alleles a, b, d respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Explain the type of genotypes of the offspring produced.

Question : [A]: Basis of adaptation is the preexisting gene mutation.[R]: In changed environment, a hidden gene mutation may express and result in survival of the organisms and finally lead to adapta- tion to new conditions.

Question : A baloon fruit is

Question : A bacterium having rDNA formed by using pBR322 and EcoRI restriction enzyme is resistant to :

Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(c) how man has exploited this protrin for his benefit?

Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(b) What type of changes occur in thegut of insects on consuming this protein?

Question : A bacterium bacillus thuringiensis produces a toxic protein named Cry protein that is lethal to certain insects but not to bacterium.(a) Why this toxic does not kill the bacteria?

Question :A bacteriophage with radioactive DNA and protein when infects a bacterium the radioactivity inside the bacterium will be located :

Question : A bacterial infection was effectively controlled by using a specific antibiotic for a long time. But nowadays this antibiotic is not found to be so effective to control the said infection .Give a scientific explanation for this phenomenon based on evolution.

Question : A bacterial cell was transformed with a recombinant DNA molecule that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be

Question : (A) bacterial cell is shown in the figure given below,lable the part (A) and

Question : Write the role of Phosphorous in plants

Question : A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that boy had twenty teeth. Which teeth were absent ?

Question : A, B, D are three independently assorting genes with their recessive alleles a, b, d, respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Find out the type of genotypes of the offspring produced.

Question : A B CC B D E F G H I From the above figure identify the type of mutation and explain it.

Question : A B C C B D E F G H I From the above figure identify the type of mutation and explain it.

Question : [A]: At any given CO_2 tension, reduced blood takes up larger amount of CO_2 than oxygenated blood.[R]: Oxygenation of blood causes evolution of CO_2 in lungs.

Question : A: As the amount of dissolved oxygen in water decreases, BOD increases. R: Microorganisms involved in biodegradation of organic matter requires a lot of dissolved O_(2).

Question : [A]: Artitical selection is done only in animal breeding.[R]: Artifical selection is done in animal breeding only.

Question : A and C are vertebrate groups having a varied number of species globally . Select the correct option.

Question : A and B chains are found in

Question : A' and 'B' are the male & female sex cells respectively which look alike and performs similar functions. 'A' and 'B' fuse to form a new individual 'D'. Which type of gametic fusion does this represent? Give an example.

Question : A: Anatropous ovule is resupinate ovule R: The body of ovule is completely bent with hilum close to micropyalr end

Question : (a) Alpine-scrub - 2900 m - 3500 m (b) Sub-Alpine forests - 4000 m - 5000 m (c) Rolling grassland - Shola (d) Higher altitude grasslands - Above 2000 m

Question : [A]: Albumin is associated with oedema.[R]: It is produced by liver.