24277 + Interview Questions in Biology in Class 12 Page 457 InterviewSolution

22801.	Question : A tobacco plant heterozygous for albinism (a recessive character) is self-pollinated and 1200 seeds are subseqently germinated. How many seedlings would have the parental phenotype?
Answer» 900 600 1200 300 Solution :`AA xxAa`=1AA:2Aa:1aa

Discussion

22802.	Question : About seven percent of carbon dioxide is transported to the lungs
Answer» as CARBAMINO compounds through RBC in a dissolved STATE through the plasma as bicarbonate IONS through RBC as bicarbonate ions through the plasma Answer :B

Discussion

22803.	Question : A tirsomic plant has 2n=24, the numberof chloromosomes in its endosperm will be:
Answer» 18 37 20 17 Solution :N//A

Discussion

22804.	Question : About ____% of human DNA sequence are same every person.
Answer» ANSWER :99.9 `%`

Discussion

22805.	Question : A tissue is characterized by the presence of thin walls and isodiametric cells that are either closely packed or have intercellular spaces. This tissue is found in
Answer» Shoot APEX WOOD fibres Pith of monocot root BAST fibres Answer :C

Discussion

22806.	Question : About ____ bp of DNA is wrapped over nu-body to complete about ____turns.
Answer» `200,3/4' `200, 1 3/4` `80, 1/2` `80, 3 1/2` ANSWER :B

Discussion

22807.	Question : A thin and weakened part of the wall of blood vessel that bulges out as a balloon like structure is called
Answer» aneurysm abscess thrombus haemotoma Answer :A

Discussion

22808.	Question : A three carbon sugar of Glycolysis is
Answer» 3 Phosphoglyceric ACID Pyruvic acid GLYCERALDEHYDE 3-phosphate 1-3 disphosphoglycericacid Answer :C

Discussion

22809.	Question : About 95 per cent of all existing transgenic animals are_____ ?
Answer» Rabbits Pigs Cows Mice Answer :D

Discussion

22810.	Question : A thermostable DNA polymerase, which remains active during the high temperatureinduced denturation of double j- strandedDNA is isolated from a bacterium
Answer» E.coli Thermus aquaticus SALMONELLA TYPHIMURIUM Thermus occus ANSWER :B

Discussion

22811.	Question : About 70% of total global carbon is found in:-
Answer» forest grassland agroecosystem oceans Answer :D

Discussion

22812.	Question : A : There is indirect relationship between rate of respiration and water absorption R : Increased metabolism increases mineral uptake .
Answer» If both ASSERTION & Reason are true and the reason is the correct explanation of the assertion, then mark (1) If both Assertion & Reason are true but the reason is NOTTHE correct explanation of the assertion, then mark (2) Assertion is true statement but Reason is false, then mark (3) If both Assertion and Reason are false statements , then mark (4) ANSWER :A

Discussion

22813.	Question : [A]: There is no phenomenon like organic evolution.[R]: Evolutior, is a discontinuous period
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

22814.	Question : About 95% of all existing transgenic animals are(A) Rabbits(B) Pigs(C) Cows(D) Mice
Answer» Rabbits Pigs Cows MICE Solution :Mice

Discussion

22815.	Question : [A]: The two members of a gene pair segre- gate from each other into the gametes. [R]: During gametogenesis, the segregation of one gene pair is independent of other gene pair.
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

22816.	Question : About 70% of total global carbon is foundin :
Answer» Oceans Forests Grasslands Agroecosystems Answer :A

Discussion

22817.	Question : [A]: The two sperms cells in a pollen tube often change their shape. [R]: The sperms are released in the synergid as intact cells but only their nuclei migrate
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

22818.	Question : Abotanystudentencounteredapalmlike,shorttreewithpinnatelycompoundleaveswithsessileleaflets bearing mid rib but no lateral veins. Unbranched stem has persistent woody leaf bases. Theplant has to be :-
Answer» CYCAS PINUS DRYOPTERIS CEDRUS ANSWER :A

Discussion

22819.	Question : [A]: The tadpoles become giant tadpoles when fed on thiourea. [R]: Thiourea is an antithyroid substance
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

22820.	Question : ABO blood groups is a good example of co-dominance. Justify.
Answer» Solution :ABO blood groups are controlled by the gene I. The gene has three alleles `I^(A), I^(B)` and i. Because humans are diploid organisms, each person possesses any two of the three I gene alleles. `I^(A) " and "I^(B)` are COMPLETELY dominant overi, in other words when `I^(A)` and i are present `I^(B)` expresses. But when `I^(A) " and " I^(B)` are present TOGETHER, they both express their own TYPES of sugars : this is because of co-dominance.

Discussion

22821.	Question : A: The space of natural ecosystem decreased R: Human population increase(A) Both A and R are true and R is correct explanation of A(B) Both A and R are true but R is not correct explanation of A(C) A is true but R is false.(D) A is false but R is true.
Answer» Both A and R are TRUE and R is correct EXPLANATION of A Both A and R are true but R is not correct explanation of A A is true but R is false. A is false but R is true. Answer :A

Discussion

22822.	Question : Abortion in the first trimester of pregnancy may occur due to lack of …………………….
Answer» aldosterone Testosterone oestrogen progesterone Answer :D

Discussion

22823.	Question : A: The soure of air pollution are natural as well as anthropogenic. R: Suspended particles in air smoke from chimneys of industrial establishment, volcanic eruption etc are considered natural air pollutants.
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

22824.	Question : ABO blood grouping is determined by three alleles. Possble genotypes and phenotypes are
Answer» 3,1 6,4 4,6 9,7 Answer :B

Discussion

22825.	Question : [A]: The sex linked genes are passed on to the grandson through the daughter. [R]: The Y chromosome of the grandson is received from the maternal grandfather
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 :C

Discussion

22826.	Question : [A]: The series of enzyme controlled reac- tions determine traits in an organism. [R]: Since the structure of specific proteins (enzymes) is controlled by the genes and fol- lows determination of traits
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

22827.	Question : ABO blood group of humans is determined by_____alleles.
Answer» ANSWER :QUANTITATIVE

Discussion

22828.	Question : [A]: The rate of photosynthesis is determined in terms of the rate of production either per unit mass of green tissue or per unit weight of total chlorophyll. [R]: Amount of light, CO_2supply and tem- perature are important internal factors 'that directly affect the photosynthesis.
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 :C

Discussion

22829.	Question : ABO blood group in human is an example of
Answer» MULTIPLE allelism Pleotropism Incomplete dominance Polygenic mechanism Answer :a

Discussion

22830.	Question : [A]: The process of speciation occurs only in allopatric populations.[R]: The sympatric species can arise either due to changes in the chromosome number or due to introgressive hybridization and poly- ploidy.
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

22831.	Question : [A]: The preparation of recombinant DNA re- quires restriction enzymes. [R]: Because these are not used to cleave plasmid DNA
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 :C

Discussion

22832.	Question : ABO blood group in man is controlled by
Answer» MULTIPLE ALLELES Lethalgenes Sexlinked GENES Y - linkedgenes ANSWER :A

Discussion

22833.	Question : [A] : The heart of birds is more advanced than the four chambered heart of crocodiles. [R]: in the bird s heart, there is a complete elimination of left aorta.
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

22834.	Question : Abnormal secondary growth is observed in
Answer» DRACAENA Cordyline Aloe All of these Answer :D

Discussion

22835.	Question : Abnormal gene is replaced by normal gene through:
Answer» GENE therapy medicines cloning radiation Answer :A

Discussion

22836.	Question : [A] : The mechanism of ATP formation in mito- chondria is almost similar to that of chloro plast. [R]: In mitochondria there is proton gradient formation inside intermembrane space whereas in chloroplast proton gradient is formed in thylakoid lumen.
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

22837.	Question : a.Bioticresources are classifiedas renewable , whilebiodiversity id calssifiedas non - renewable . Justifythe statement. b."Taungya system" belongot social Forestry. Do youagreewith thisstatement ? Substantiateyour answer .
Answer» SOLUTION :a.Biotic resource are products of LIVINGTHINGS. It can berenewed through proper MANAGEMENT. b. YES, " Taungyasystem" involves growingof agricultural crops betweenrows of planted TREES.

Discussion

22838.	Question : [A]: The natural hybrids of the species are either totally absent or are very rare.[R]: Because members of separate species do not interbreed usually
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

22839.	Question : Abiotic degradable pollutants are more toxic because
Answer» Of biomagnification They STAY for LONG time They NEVER destroy They are never RECYCLING Answer :A

Discussion

22840.	Question : [A]: The ideas of Thomas Malthus are more applicable today.[R]: Malthus told that man's ability to master the environment is limitless.
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 :C

Discussion

22841.	Question : Abiotic components of ecosystem includes
Answer» Water Air Fungi Both (A) and (B) ANSWER :D

Discussion

22842.	Question : [A]: The first life orginated was chemo-het- erotrophic.[R]: The first life originated in sea water.
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

22843.	Question : Abingdon tortoise in Galapagos islands became extinct with in -(1)- after -(2), were introduced on the island, apparently due to the greater browsing efficiency of the -(3)-
Answer» (1) a year, (2) DARWIN finches, (3) tortoise (1) a decade, (2) goats, (3) tortoise (1) a year, (2) GOAT, (3) goat (1) a decade, (2) goats, (3) goats ANSWER :D

Discussion

22844.	Question : (A) : The first transgenic animal produced was the "super mouse". (R) : It was made by the incorporation of gene for human growth hormone.
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 THECORRECT explanation of (A). If (A) is true but (R) is false. If both (A) and (R) are false. Answer :B

Discussion

22845.	Question : Abiogenesis
Answer» SOLUTION :It is the ORIGIN of LIFE from non-living MATTER.

Discussion

22846.	Question : a. The ''Evil Quartet'' is the nickname used to describe the causes of biodiversity losses. Explain the reasons leading to accelerated rates of extinction of flora and fauna.
Answer» Solution :a. i. Habitat LOSS and fragmentation ii. Over exploitation iii. Alien species invasions iv. Coextinction b. AGREE with this statement as we have a moral duty to care for their well being and pass on our biological legacy in good order to future generation. Protective measures are i. In-situ conservation: Conserving the ANIMALS or plants in the same situation in which they are living. e.g. Biosphere reserve, National park, Sanctuaries etc. ii. Ex-situ conservation: Conserving the animals or plants in another PLACE like zoo, botanical garden, SEED bank, sperm banks etc.

Discussion

22847.	Question : Ability to produce maximum offsprings is
Answer» BIOTIC POTENTIAL CARRYING capacity ENVIRONMENTAL resistance None of these Answer :A

Discussion

22848.	Question : a. The following are the important steps in plant breeding for developing a new plant variety. List them in the correct order: i. Seed multiplication ii. Release of a variety iii. Distribution iv. Evaluation v. Creation of genetic variation vi. Selection b. In spite of the proper application of fertilizers, irrigation and pest and disease control the yield, quality and disease and pest resistance of a self pollinated crop variety is decreasing generation after generation. Suggest a possible reason for this experience. Hint: The farmer is using seed collected from his own field for raising successive crops.
Answer» Solution :a. i. CREATION of genetic VARIATION II. Selection III. Evaluation iv. Release of VARIETY v. Seed multiplication vi. Distribution b. Inbreeding depression

Discussion

22849.	Question : Ability of tasting PTC is a hereditary character.T is dominant and't' recessive .Which genotype will not be able to taste PTC ?
Answer» TT Tt tt non of these Answer :C

Discussion

22850.	Question : [A]: The establishment of reproductive isola- tion is an event of biological significance.[R]: Because in absence of reproductive iso- lation they can merge back into single popu- lation
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

Explore topic-wise InterviewSolutions in .

Question : A tobacco plant heterozygous for albinism (a recessive character) is self-pollinated and 1200 seeds are subseqently germinated. How many seedlings would have the parental phenotype?

Question : About seven percent of carbon dioxide is transported to the lungs

Question : A tirsomic plant has 2n=24, the numberof chloromosomes in its endosperm will be:

Question : About ____% of human DNA sequence are same every person.

Question : A tissue is characterized by the presence of thin walls and isodiametric cells that are either closely packed or have intercellular spaces. This tissue is found in

Question : About ____ bp of DNA is wrapped over nu-body to complete about ____turns.

Question : A thin and weakened part of the wall of blood vessel that bulges out as a balloon like structure is called

Question : A three carbon sugar of Glycolysis is

Question : About 95 per cent of all existing transgenic animals are_____ ?

Question : A thermostable DNA polymerase, which remains active during the high temperatureinduced denturation of double j- strandedDNA is isolated from a bacterium

Question : About 70% of total global carbon is found in:-

Question : A : There is indirect relationship between rate of respiration and water absorption R : Increased metabolism increases mineral uptake .

Question : [A]: There is no phenomenon like organic evolution.[R]: Evolutior, is a discontinuous period

Question : About 95% of all existing transgenic animals are(A) Rabbits(B) Pigs(C) Cows(D) Mice

Question : [A]: The two members of a gene pair segre- gate from each other into the gametes. [R]: During gametogenesis, the segregation of one gene pair is independent of other gene pair.

Question : About 70% of total global carbon is foundin :

Question : [A]: The two sperms cells in a pollen tube often change their shape. [R]: The sperms are released in the synergid as intact cells but only their nuclei migrate

Question : Abotanystudentencounteredapalmlike,shorttreewithpinnatelycompoundleaveswithsessileleaflets bearing mid rib but no lateral veins. Unbranched stem has persistent woody leaf bases. Theplant has to be :-

Question : [A]: The tadpoles become giant tadpoles when fed on thiourea. [R]: Thiourea is an antithyroid substance

Question : ABO blood groups is a good example of co-dominance. Justify.

Question : A: The space of natural ecosystem decreased R: Human population increase(A) Both A and R are true and R is correct explanation of A(B) Both A and R are true but R is not correct explanation of A(C) A is true but R is false.(D) A is false but R is true.

Question : Abortion in the first trimester of pregnancy may occur due to lack of …………………….

Question : A: The soure of air pollution are natural as well as anthropogenic. R: Suspended particles in air smoke from chimneys of industrial establishment, volcanic eruption etc are considered natural air pollutants.

Question : ABO blood grouping is determined by three alleles. Possble genotypes and phenotypes are

Question : [A]: The sex linked genes are passed on to the grandson through the daughter. [R]: The Y chromosome of the grandson is received from the maternal grandfather

Question : [A]: The series of enzyme controlled reac- tions determine traits in an organism. [R]: Since the structure of specific proteins (enzymes) is controlled by the genes and fol- lows determination of traits

Question : ABO blood group of humans is determined by_____alleles.

Question : [A]: The rate of photosynthesis is determined in terms of the rate of production either per unit mass of green tissue or per unit weight of total chlorophyll. [R]: Amount of light, CO_2supply and tem- perature are important internal factors 'that directly affect the photosynthesis.

Question : ABO blood group in human is an example of

Question : [A]: The process of speciation occurs only in allopatric populations.[R]: The sympatric species can arise either due to changes in the chromosome number or due to introgressive hybridization and poly- ploidy.

Question : [A]: The preparation of recombinant DNA re- quires restriction enzymes. [R]: Because these are not used to cleave plasmid DNA

Question : ABO blood group in man is controlled by

Question : [A] : The heart of birds is more advanced than the four chambered heart of crocodiles. [R]: in the bird s heart, there is a complete elimination of left aorta.

Question : Abnormal secondary growth is observed in

Question : Abnormal gene is replaced by normal gene through:

Question : [A] : The mechanism of ATP formation in mito- chondria is almost similar to that of chloro plast. [R]: In mitochondria there is proton gradient formation inside intermembrane space whereas in chloroplast proton gradient is formed in thylakoid lumen.

Question : a.Bioticresources are classifiedas renewable , whilebiodiversity id calssifiedas non - renewable . Justifythe statement. b."Taungya system" belongot social Forestry. Do youagreewith thisstatement ? Substantiateyour answer .

Question : [A]: The natural hybrids of the species are either totally absent or are very rare.[R]: Because members of separate species do not interbreed usually

Question : Abiotic degradable pollutants are more toxic because

Question : [A]: The ideas of Thomas Malthus are more applicable today.[R]: Malthus told that man's ability to master the environment is limitless.

Question : Abiotic components of ecosystem includes

Question : [A]: The first life orginated was chemo-het- erotrophic.[R]: The first life originated in sea water.

Question : Abingdon tortoise in Galapagos islands became extinct with in -(1)- after -(2), were introduced on the island, apparently due to the greater browsing efficiency of the -(3)-

Question : (A) : The first transgenic animal produced was the "super mouse". (R) : It was made by the incorporation of gene for human growth hormone.

Question : Abiogenesis

Question : a. The ''Evil Quartet'' is the nickname used to describe the causes of biodiversity losses. Explain the reasons leading to accelerated rates of extinction of flora and fauna.

Question : Ability to produce maximum offsprings is

Question : Ability of tasting PTC is a hereditary character.T is dominant and't' recessive .Which genotype will not be able to taste PTC ?

Question : [A]: The establishment of reproductive isola- tion is an event of biological significance.[R]: Because in absence of reproductive iso- lation they can merge back into single popu- lation

Question : About bp of DNA is wrapped over nu-body to complete about turns.