24277 + Interview Questions in Biology in Class 12 Page 303 InterviewSolution

15101.	Question : In the stomach dilute HCL is secreted by ____cells.
Answer» GOBLET cells Oxyntic cells Zymogen cell Mucous cell Answer :B

Discussion

15102.	Question : In_____ the stem performs the function of storage perennation .
Answer» Onion Ginger Pistia Dahlia Answer :B

Discussion

15103.	Question : In the snail population described above, 20 of snails are yellow(b/b) and 80 are black(B/Bor b/b). Of the 80 black snails 30 are homozygous and 50 are heterozygous. How many of the loci for this Gene are occupied by the B allele?
Answer» 80 90 100 110 Answer :A

Discussion

15104.	Question : In the serological tests of Nuttal with human antiserum a thick precipitate is formed with the serum of
Answer» ANTHROPOID APE Monkey Rabbit Dog ANSWER :A

Discussion

15105.	Question : In the seed of wheat, an embryo possesses large drum shaped cotyledon. By what name it is called?
Answer» Epiblast Coleorhiza scutellum Coleoptile Answer :C

Discussion

15106.	Question : In the seed rate of respiration is:
Answer» Normal Very high Very LOW Zero Answer :C

Discussion

15107.	Question : In the second step of trophic level, the energy storage is primarily associated with
Answer» GROSS PRIMARY productivity net primary productivity secondary productivity none of the above Answer :C

Discussion

15108.	Question : In the scale used in Geological clock, 1 minute = ......... years.
Answer» 52,000 YEARS 18,75,00,000 years 52,500 years 3,25,000 years Solution :3,25,000 years

Discussion

15109.	Question : In the root nodules of Myrica, symbiotic nitrogen fixing organism is
Answer» Rhizobium Nostoc Frankia Anabaena Answer :C

Discussion

15110.	Question : In the ' Rivet - popper ' hypothesis , Ehrlich compared ecosystem with airplane . Accordingly identify ( A ) and ( B ) which were compared to rivets and rivets on wings respectively.
Answer» A = KEYSTONE SPECEIS , B = Species A = Species , B = Keystone species A=species, B=keystone species A = PREY , B = Predators Answer :C

Discussion

15111.	Question : In the rest state, a subunit of Troponin masks :-
Answer» Active binding sites for ACTIN on the MYOSIN FILAMENTS Active binding sites for myosin on the myosin filaments Active binding sites for myosin on the actin filaments Active binding sites for actin on the actin filaments ANSWER :C

Discussion

15112.	Question : In the rest state, a subunit of Troponin masks:-
Answer» ACTIVE BINDING sites for ACTIN on the myosin filaments Active binding sites for myosin on the myosin filaments Active binding sites for myosin on the actin filaments Active binding sites for actin on the actin filaments Answer :C

Discussion

15113.	Question : In the replication process the two way directional activity known as ……………………
Answer» one directional TWO directional THREE directional GROWTH SOLUTION :two directional

Discussion

15114.	Question :In the region of A-band of a myofibril of a skeletal muscle where thick and thin filaments overlap. each thick filament is surrounded by
Answer» Six THICK FILAMENTS Two thick filaments Three thick filaments Four thick filanients ANSWER :C

Discussion

15115.	Question : In the reductive process, the conversion of nitrogen into ammonia occurs by
Answer» nitrosomonas rhizobium nitrococcus pseudomonas Answer :B

Discussion

15116.	Question : In the ratio 12 : 3 : 1 in summer squash for fruit colour, 12 stands for
Answer» YELLOW FRUITS GREEN fruits WHITE fruits none on the above

Discussion

15117.	Question : In the pyramid of biomass drawn below, name the two crops (I) one which is supported (ii) one which supports .In which ecosystem is such a pyramid found.
Answer» Solution :(i) supported TROPHIC level is formed by zooplanktons (II) supported trophic level is formed by zooplanktons ecosystem.It is found in aquatic eocsystem.

Discussion

15118.	Question : In the R-FR exposure of plants it is the_____ treatment that counts.
Answer» FIRST MIDDLE LAST SUM total Answer :C

Discussion

15119.	Question : In the prothallus of avascular cryptogam, the antherozoids and egs mature at different times, as a result
Answer» there is no change in success RATE of FERTILISATION there is high degree of sterility one can CONCLUDE that the plant is apomictic self fertilisation is prevented Solution :(d) In the PROTHALLUS of a vascular cryptogam, thhe antherozoids and eggs mature at DIFFERENT times. As a result self fertilisation is prevented.

Discussion

15120.	Question : In the prothallu.s of a vascular cryptogam, the antherozoids andeggs mature at different times. As a result,
Answer» There is high DEGREE of sterility One can CONCLUDE that the plant is apomictic Self fertilization is prevented. There is no CHANGE in success rate of fertilization Answer :C

Discussion

15121.	Question : In the production of test tube babies:
Answer» FERTILIZATION is EXTERNAL and FOETUS FORMATION is INTERNAL Fertilization is internal and foetus formation is external Fertilization and foetus formation are external Fertilization and foetus formation are internal Answer :A

Discussion

15122.	Question : In the process of organic evolution, which of the following appeared for the first time inpteridophytes :-
Answer» Alternation between haploid and diploid generations Progressive evolution of gametophytes and SPOROPHYTES ELABORATION of diploid generation and reduction in haploid generation All of the above ANSWER :C

Discussion

15123.	Question : In the present scenario of Calvin cycle, the following carbon compounds exist in monophsphate as well as bisphosphate states.
Answer» `C_(3) , C_(4)` and `C_(6)` only `C_(3), C_(5)` and `C_(7)` only `C_(3) , C_(5) C_(6)`and `C_(7)` only `C_(3) ,C_(4) C_(5)`and `C_(7)` only Answer :C

Discussion

15124.	Question : In the presence of an enzyme, the activation energy of a reaction
Answer» Increases Decreases Remains same Cannot be predicted Answer :B

Discussion

15125.	Question : In the picture given below, A and B represents the two different biomes. What does the letter C denotes? What will be its impact on the organisms in C. Explain with example.
Answer» Solution :The letter C denotes Ecotone - a transition zone between two DIFFERENT ECOSYSTEM. Those species found in the ecotone will have impact of environment of two HABITATS. E.g. Owl in the ecotone area between forest and grassland.

Discussion

15126.	Question : In the picture given above, A_1 "and" A_2 denotes two different types of cells performing body's defence mechanism against the pathogens B_1 "and" B_2 Name the cellular type represented by A_1 "and" A_2 and also mention the respective type of immunity conferred by A_1 "and" A_2
Answer» SOLUTION :`A_1` T CELLS conferring Cell MEDIATED Immunity (CMI) `A_2` - B cells conferring Antibody Mediated Immunity (AMI) humoral immunity

Discussion

15127.	Question : In the phosphorus cycle weathering makes phosphate available fist to :
Answer» Producers CONSUMERS Tertiary consumers Decomposers Answer :A

Discussion

15128.	Question : In the persons of ____ blood group both a and b antibodiesare present.
Answer» ANSWER :O-blood GROUP

Discussion

15129.	Question : In the pedigree shown below, individuals with the solid symbols suffers from albinism. You would counsel the couple A & B that the probability that each of their child will have the disease is :-
Answer» 0 0.25 0.25 0.75 Answer :C

Discussion

15130.	Question : In the past Indian Ayurvedic system considered that the persons having black bile would have fever. a. Name the person who is considered as the father of medicine. b. What made the change in the belief of having black bile during fever? c. Who was the person behind this discovery?
Answer» SOLUTION :a. Hippocrates b. Discovery of BLOOD circulation C. William HARVEY

Discussion

15131.	Question : In the operon system , the repressor protein can bind only with the :
Answer» STRUCTURAL GENES REGULATORY gene Operator gene Promotor gene Answer :C

Discussion

15132.	Question : In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term ?
Answer» Solution :In north eastern region of India, FORESTS are cleaned by BURNING during the process of zoom cultivation process and it is left for one year for growing. In the language of ecological SCIENCE, how will you describe the recultivating process of forest. Forests are cleared by burning and are left for cultivation that shows secondary succession. Till when soil is available supressed seeds open for germination. Wind and other natural efforts spread and new seeds COME into region and habitat of new species will be done in forest once again.

Discussion

15133.	Question : In the myopia eye defect, the rays of light :-
Answer» Do not enter the eye at all Come to a FOCUS at BACK of RETINA Come to a focus in FRONT of the retina Come to a focus in between retina & iris Answer :C

Discussion

15134.	Question : In the monohybrid cross the F_(1) hybrid produces two kinds gameters each with only one character. It is explained as
Answer» INHERITED factor Purity of gametes Alleles Heterozygous Answer :B

Discussion

15135.	Question : In the monocotylendonous seeds the endosperm is seprated from the embryo by a distinict layer known as
Answer» Testa Aleuronelayer Tegmen Scutellum Answer :B

Discussion

15136.	Question : In the modernworld thereare different types ofsubstance that may cause pollution. A prominentwastein the moderncomputerworld is "e-waste The e-waste " stand for
Answer» Eliminatedwaste ERODED waste Electronic waste Enriched waste Answer :C

Discussion

15137.	Question : In the monocotyledonous seeds , the endosperm is separated from the embryo by a distinct layer known as
Answer» TESTA ALEURONE LAYER TEGMEN Scutellum Answer :B

Discussion

15138.	Question : In the model of phosphorus cycle given below, what does A,B ,C and D refer to ?
Answer» SOLUTION :A = Sumerged PLANT stage B= Reed-Swamp stage C= Scrub stage D = Forest stage

Discussion

15139.	Question : In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem? Give some symptoms of allergic reactions.
Answer» Solution :Polluted ENVIRONMENT of the metropolitan cities is responsible for ALLERGY and ASTHMA. Also, life style of metropolitan cities lowers immunity and increases SENSITIVITY to allergens which occur in higher percentage in the air of metropolitan cities. Symptoms of allergy are SNEEZING, watery eyes, running nose and difficulty in breathing.

Discussion

15140.	Question : In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem. Give some symptoms of allergic reactions.
Answer» Solution :Allergy is the exaggerated response of the immune system of CERTAIN antigens present in the environment. In metropolitan cities life style is responsible for lowering of immunity and SENSITIVITY to allergens. More polluted environment of metro cities increases the CHANCES of allergy in children. Some symptoms of ALLERGIC reactions are SNEEZING, watery eyes, running nose and difficulty in breathing

Discussion

15141.	Question : In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium ?
Answer» Solution :Lac operon is a segment of DNA that is made up of three adjacent structural genes, namely, an operator GENE, a promoter, gene and a regulator gene. It works in a coordinated manner to metabolize LACTOSE into glucose and galactose. In lac operon, lactose acts as an inducer. It binds to the REPRESSOR and inactivates it. Once the lactose binds to the repressor RNA polymerase binds to the promoter REGION. Hence three structural genes express their product and respective enzymes are produced. These enzymes act on lactose so that lactose is metabolized into glucose and galactose. After sometime when the LEVEL of inducer decreases as it is completely metabolized by enzymes, it causes synthesis of the repressor from regulator gene. The repressor bind to the operator gene and prevent RNA polymerase from transcribing the operon. Hence the transcription is stopped. This type of regulation is known as negative regulation.

Discussion

15142.	Question :In the medium where E. coli was growing, lactose was added, whichinduced the lac operon. Then, why does lac operon shut down some timeafter addition of lactose in the medium?
Answer» Solution :The lac OPERON is REGULATED by the amount of LACTOSE in the medium where the bacteria are grown. When the amount of lactose is exhausted in the medium, the lac operon SHUTS down.

Discussion

15143.	Question : In the mechanism of action of a protein hormone ,one of the second messengers is
Answer» CYCLIC AMP Insulin `T_(3)` Gastrin Answer :A

Discussion

15144.	Question : In the majority of the flowering plants, female gametophytes having eight nuclei is
Answer» tetrasporic MONOSPORIC BISPORIC trisporic ANSWER :B

Discussion

15145.	Question : In the long dark phase
Answer» `P_("fr")` form remains unchanged only `50%` `P_("fr")` CHANGES to `P_(r)` `P_("fr")` changes to `P_(r)` change from `P_("fr")" to "P_(r)` OCCURS after flowering Answer :C

Discussion

15146.	Question : In the light of Griffith's experiment , explain the action of two strains of Diplococcus pneumoniase and give his conclusion .
Answer» Solution :Explanation of two strains of Diplococcus pneumontae in the light o( Griffith experiment : ( 1) Griffith perfa rmed experiments using a bacterium, Diplococcus pneumoniae which infects mammals with pneumonia. (2). This bacterium has two strains, viz., 'S' type which is smooth and capsulated and 'R' type which is noncapsulated and ROUGH. 'S' type bacterium is virulent, capable of causing pneumonia if injected into healthy mice. 'R' type bacterium is nonvirulent and does n9t cause infection when injected into healthy mice. (3) Griffith performed four sets of experiments: . (i) In first set, he injected mice with 'S' type of bacteria. Here mice DEVELOPED pneumonia. (ii) In second set, he injected mice with 'R' type of bacteria. Mice remained healthy as they did not catch infection of pneumonia. (iii) In third experiment, he injected heat killed 'S' type of bacteria in the mice. Mice in this case remained healthy. (iv) In fourth experiment, he took the mixture of heat killed 'S' type bacteria and living 'R' type bacteria. He injected this mixture into healthy mice. Mice were infected with. pneumonia and died. (4) To analyze the results, Griffith collected the blood sample from dead mice. He obtained living 'S' type bacteria after culturing the blood samples. 2. Conclusion of Griffith: (I) Griffith concluded that living 'R' type bacteria picked up virulence from the dead 'S' type bacteria which were present in the mixture. He called this phenomenon as transformation. (2) The transforming principle present in dead 'S' type bacteria was picked up from the surrounding MEDIUM and transformed into the living 'R' bacteria. 'R'type bacteria were ABLE to synthesize a smooth polysaccharide coat or capsule and became virulent. This transforming principle was passed on to the next generations. Hence it was thought to be the genetic material. Later it was found to be DNA.

Discussion

15147.	Question : In the life history of Aurelia, the correct chronological sequence of larva stages is
Answer» ANSWER :C

Discussion

15148.	Question : In the life cycle of malarial parasite, female anopheles mosquito act as -----host
Answer» SOLUTION :PRIMARY

Discussion

15149.	Question : In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of:
Answer» BUNDLE sheath Phloem Epidermis Meosphyll Answer :D

Discussion

15150.	Question : In the leaves of C_(4)-plants, malic acid formation during CO_(2)-fixatino occurs in
Answer» mesophyll bundle SHEATH phloem epidermis Solution :The oxalic acid is reduced to malic acid in mesophyll cells, from CHLOROPLAST of mesophyll cells the malic acid is TRANSFERRED to the chloroplast of bundle sheath cells where, it is decarboxylated to FORM `CO_(2)` and pyruvic acid.

Discussion

Explore topic-wise InterviewSolutions in .

Question : In the stomach dilute HCL is secreted by ____cells.

Question : In_____ the stem performs the function of storage perennation .

Question : In the snail population described above, 20 of snails are yellow(b/b) and 80 are black(B/Bor b/b). Of the 80 black snails 30 are homozygous and 50 are heterozygous. How many of the loci for this Gene are occupied by the B allele?

Question : In the serological tests of Nuttal with human antiserum a thick precipitate is formed with the serum of

Question : In the seed of wheat, an embryo possesses large drum shaped cotyledon. By what name it is called?

Question : In the seed rate of respiration is:

Question : In the second step of trophic level, the energy storage is primarily associated with

Question : In the scale used in Geological clock, 1 minute = ......... years.

Question : In the root nodules of Myrica, symbiotic nitrogen fixing organism is

Question : In the ' Rivet - popper ' hypothesis , Ehrlich compared ecosystem with airplane . Accordingly identify ( A ) and ( B ) which were compared to rivets and rivets on wings respectively.

Question : In the rest state, a subunit of Troponin masks :-

Question : In the rest state, a subunit of Troponin masks:-

Question : In the replication process the two way directional activity known as ……………………

Question :In the region of A-band of a myofibril of a skeletal muscle where thick and thin filaments overlap. each thick filament is surrounded by

Question : In the reductive process, the conversion of nitrogen into ammonia occurs by

Question : In the ratio 12 : 3 : 1 in summer squash for fruit colour, 12 stands for

Question : In the pyramid of biomass drawn below, name the two crops (I) one which is supported (ii) one which supports .In which ecosystem is such a pyramid found.

Question : In the R-FR exposure of plants it is the_____ treatment that counts.

Question : In the prothallus of avascular cryptogam, the antherozoids and egs mature at different times, as a result

Question : In the prothallu.s of a vascular cryptogam, the antherozoids andeggs mature at different times. As a result,

Question : In the production of test tube babies:

Question : In the process of organic evolution, which of the following appeared for the first time inpteridophytes :-

Question : In the present scenario of Calvin cycle, the following carbon compounds exist in monophsphate as well as bisphosphate states.

Question : In the presence of an enzyme, the activation energy of a reaction

Question : In the picture given below, A and B represents the two different biomes. What does the letter C denotes? What will be its impact on the organisms in C. Explain with example.

Question : In the picture given above, A_1 "and" A_2 denotes two different types of cells performing body's defence mechanism against the pathogens B_1 "and" B_2 Name the cellular type represented by A_1 "and" A_2 and also mention the respective type of immunity conferred by A_1 "and" A_2

Question : In the phosphorus cycle weathering makes phosphate available fist to :

Question : In the persons of ____ blood group both a and b antibodiesare present.

Question : In the pedigree shown below, individuals with the solid symbols suffers from albinism. You would counsel the couple A & B that the probability that each of their child will have the disease is :-

Question : In the past Indian Ayurvedic system considered that the persons having black bile would have fever. a. Name the person who is considered as the father of medicine. b. What made the change in the belief of having black bile during fever? c. Who was the person behind this discovery?

Question : In the operon system , the repressor protein can bind only with the :

Question : In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term ?

Question : In the myopia eye defect, the rays of light :-

Question : In the monohybrid cross the F_(1) hybrid produces two kinds gameters each with only one character. It is explained as

Question : In the monocotylendonous seeds the endosperm is seprated from the embryo by a distinict layer known as

Question : In the modernworld thereare different types ofsubstance that may cause pollution. A prominentwastein the moderncomputerworld is "e-waste The e-waste " stand for

Question : In the monocotyledonous seeds , the endosperm is separated from the embryo by a distinct layer known as

Question : In the model of phosphorus cycle given below, what does A,B ,C and D refer to ?

Question : In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem? Give some symptoms of allergic reactions.

Question : In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem. Give some symptoms of allergic reactions.

Question : In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium ?

Question :In the medium where E. coli was growing, lactose was added, whichinduced the lac operon. Then, why does lac operon shut down some timeafter addition of lactose in the medium?

Question : In the mechanism of action of a protein hormone ,one of the second messengers is

Question : In the majority of the flowering plants, female gametophytes having eight nuclei is

Question : In the long dark phase

Question : In the light of Griffith's experiment , explain the action of two strains of Diplococcus pneumoniase and give his conclusion .

Question : In the life history of Aurelia, the correct chronological sequence of larva stages is

Question : In the life cycle of malarial parasite, female anopheles mosquito act as -----host

Question : In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of:

Question : In the leaves of C_(4)-plants, malic acid formation during CO_(2)-fixatino occurs in