24277 + Interview Questions in Biology in Class 12 Page 421 InterviewSolution

21001.	Question : Assertion. The ability of certain DNA sequence in the genome to move from one site to another, without any sequence relationship is called transposition Reason. The message from nuclear DNA for the synthesis of specific cytoplasmic protein is carried by m-RNA
Answer» If both ASSERTION and Reason are TRUE and the Reason is a CORRECT explanation of the Assertion . If both Assertion and Reason are true but Reason is not a correct EXPLANATIONS of the Assertion If Assertion is true but the Reason is FALSE . If both Assertion and Reason are false. Answer :B

Discussion

21002.	Question : Assertion: Terrorist are trying to adopt bioweapons these days.Reason: Bioweapons are liked by terrorist organisation as these are costly.
Answer» ANSWER :C

Discussion

21003.	Question : Assertion :- Tasmanian wolf and Placental wolf are the good example of convergent evolution. Reason :- More than one adaptive radiation apperared to have occured in an isolated geographical area, (representing different habitats) one can call this convergent evolution.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is a not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are false. Answer :A

Discussion

21004.	Question : Assertion. Temin modified Crick's ‘central dogma’ to ‘central dogma reverse.’ Reason. Crick was of the view that flow of genetic information in cells is bidirectional.
Answer» If both Assertion and Reason are true and the Reason is a CORRECT explanation of the Assertion . If both Assertion and Reason are true but Reason is not a correct explanations of the Assertion If Assertion is true but the Reason is FALSE . If both Assertion and Reason are false. Answer :C

Discussion

21005.	Question : Assertion : Template or antisense strand , having 3' rarr 5'polarity takes part in transcription. Reason : Non-template or sense strand, having 5' rarr3' polarity, does not take part in transcription.
Answer» If both assertion and reason are TRUE and reason is the CORRECT explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(B)

Discussion

21006.	Question : Assertion : Systematicsis the branch of biology that dealswith classificationof living organism . Reason : The aim of classification is to group the organismin an orderly manner.
Answer» If both the ASSERTION and reason are true ANDREASON is correct explanation of the assertion . If both the assertion and reason are true but reason is not a correct explanation of the assertion . If the assertion is true but the reason is false. If both assertion and reason are false. Solution :Taxonomy or SYSTEMATICS is the branch of biology for the classification of biological WORLD of living organism. The classification is the grouping of the organisms in an ORDERLY manner . This grouping is based upon similarities and dissimilarities.

Discussion

21007.	Question : Assertion : Surgical methods of contraception are practiced to space two successive conceptions. Reason : During surgical methods, ovaries from females or testes from males are removed.
Answer» If both Assertion and Reason are true but the reason is the correct explanation of the assertion, then mark (1). If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true but Reason is false, then mark (3). If both Assertion and Reason are false, then mark (4). ANSWER :D

Discussion

21008.	Question : Assertion : Synthesisof daughter or new srand accurs continuously along the parent 3' rarr 5'strand. Reason:DNA polymerase can polymerise nucleotides in 3' rarr 5' direction on 5' rarr 3' strand.
Answer» If both ASSERTION and reason are true and reason is the CORRECT explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(c) : DNA -polymerase nucleotides only in `5' rarr 3'` DIRECTION on `3'rarr5'` strand because it adds them at the 3' END

Discussion

21009.	Question : Assertion :- Surgical methods is terminal method to prevent any more pregnency. Reason :- Surgical intervention blocks lumen of uterus there by prevent implantation.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :C

Discussion

21010.	Question : Assertion : Surgical method blocks gamete transport and thereby prevents conception. Reason : Surgical method used in males for this purpose is called vasectomy.
Answer» If both Assertion and Reason are true but the reason is the CORRECT explanation of the assertion, then MARK (1). If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true but Reason is false, then mark (3). If both Assertion and Reason are false, then mark (4). ANSWER :B

Discussion

21011.	Question : Assertion : Subsequent encounter with the same pathogen elicits a highly intensified anamnestic response. Reason : This is based on the fact that our body appears to have memory of the first encounter.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertin is true but reason is false. If both assertion and reason are false. Solution :N//A

Discussion

21012.	Question : Assertion : Stigma of pistil receives the pollen during pollination. Reason: Pollen grains are produced in ovary of gynoecium.
Answer» If both ASSERTION and REASON are true and Reason is CORRET explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :C

Discussion

21013.	Question : Assertion :- Sterilization is a terminal method used only for males. Reason :- This technique is highly effective and reversibility is good.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are False. ANSWER :D

Discussion

21014.	Question :Assertion :-Stems of maize and sugarcane have supporting roots. Reason :-Fibrous root system of maize and sugarcane can not anchor their large sized stem.
Answer» If both ASSERTION & Reason are True & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False If both Assertion & Reason are false Answer :A

Discussion

21015.	Question : Assertion : Sporopollenin preserves pollen in fossil deposits. Reason : Sporopollenin is resistant to physical and biological decomposition
Answer» assertion is TRUE, REASON is false assertion is false, reason is true Both assertion and reason are not true Both assertion and reason are true Answer :A::B::D

Discussion

21016.	Question : Assertion: Spermatogenesis occurs in the seminiferous tubules and testosterone secretion takes place in the interstitial cells of the testes. Reason: Growth and maturation of secondary sex organs and the development of accessory sex characters are brought out by testosterone.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

21017.	Question : Assertion : Speed disposal by wind is called as anemochory. Reason : The seeds are light, minute and may be winged.
Answer» If both Assertion and REASON are true and Reason is CORRET explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :A

Discussion

21018.	Question : Assertion: Somaclonal variations occur in tissue culture processes Reason: Variations cannot occur in nature.
Answer» If both Assertion and Reason are true and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the Reason is not the correct explanation of the assertion If assertion is true but the Reason are false If both Assertion and Reason are false Answer :C

Discussion

21019.	Question : Assertion :- Solubility of alkali metal hydroxide increases on moving down the group. Reason :- On moving down the group, hydration energy increases and lattice energy decreases.
Answer» If both ASSERTION & Reason are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. ANSWER :C

Discussion

21020.	Question : Assertion: Soil erosion is also caused due to excessive water logging. Reason: By slipping of large boulders from a glacier, sheet erosion is caused.
Answer» If both Assertion and REASON are true and the Reason is the correct explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE If both Assertion and Reason are false. Solution :If both Assertion and Reason are false.

Discussion

21021.	Question : Assertion : Sexually transmitted diseases get transmitted from the infected to the normal person, only during sexual contact. Reason : All sexually transmitted diseases can be cured by antibiotics.
Answer» If both ASSERTION and Reason are true but the reason is the CORRECT explanation of the assertion, then mark (1). If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true but Reason is FALSE, then mark (3). If both Assertion and Reason are false, then mark (4). Answer :D

Discussion

21022.	Question : Assertion: Skin ofleech is kept moist and slimy. Reason : It is due to secretion of mucus which also prevents it from drying
Answer» Both Assertion and REASON are true and Reason is CORRECT explanation of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is FALSE. Both Assertion and Reason are false. Solution :Both Assertion and Reason are true and Reason is correct explanation of Assertion.

Discussion

21023.	Question : Assertion: sinus venosus is a thin-walled sac with little muscular tissue in primitive heart. Reason: It receives venous blood through the hapatic veins.
Answer» If both ASSERTION and Reason are true and the Reason is the correct EXPLANATION of the assertion. If both assertion and Reason are true but the reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution :Sinus venosus is found in primitive VERTEBRATES.

Discussion

21024.	Question : Assertion : Sickle-cell anaemia is an autosome-linked recessive disorder that can be transmitted if both parents are heterozygous for the gene Reason : In sickle-cell anaemia, haemoglobin molecule undergoes polymerisation under low oxygen tension causing the change in shape in RBC
Answer» A and R both are correct and R is correct EXPLANATION of A A and R both are correct and R is not correct explanation of A A is correct but R is incorrect A and R both are incorrect Answer :B

Discussion

21025.	Question : Assertion : Sex education in schools is not necessary. Reason: Sex education may increase certain myths and conceptions in the students.
Answer» If both ASSERTION CORD REASON are true and Reason is correct EXPLANATION of Assertion If both Assertion and Reason are true but Reason is not correct explanation of Assertion If Assertion is true but Reason is FALSE. If both Assertion and Renson are false. Answer :D

Discussion

21026.	Question : Assertion : Sewage, industrial effluents and waste water are non-point sources of water pollution. Reason : Surface runoff is point source of water pollution.
Answer» (a) Both, ASSERTION and Reason, are TRUE and Reason is the correct explanation of Assertion (b) Both, Assertion and Reason, are true but Reason is not the correct explanation of Assertion (c) If Assertion is true but Reason is false (d) If Assertion is false but Reason is true Solution :POINT source of water POLLUTION is caused by discharge of effluents at one point. Non-point source of water pollution is caused by discharge of pollutants over a wide area. Sewage, industrial effluents and waste water are point source pollutants while surface runoff is a non-point source POLLUTANT.

Discussion

21027.	Question : Assertion :- Sensory neuron from toes to CNS is one of the longest nerve in the body Reason:- Sensory nerve form the synapse at both dendrites and axon terminals.
Answer» If both assertion and REASON are true and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is FALSE. If both assertion and reason are false. Answer :C

Discussion

21028.	Question : Assertion . Seeds are found in gymnosperms and angiosperm .
Answer» If both Assertion and Reason are TRUE and the Reason is a correct EXPLANATION of the Assertion . If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion . If Assertion is true and but the Reason is FALSE. If both Assertion and Reason are false. Answer :B

Discussion

21029.	Question : Assertion: Seeded plants are highly evolved. Reason : In spermatophyta, seeds are formed.
Answer» If both ASSERTION and Reason are true and Reason is corret EXPLANATION of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :B

Discussion

21030.	Question : Assertion: Sedatives are used in sleeping pills. Reason: Sedatives contain opiates which reduce tension and anxiety.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the correct EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :C

Discussion

21031.	Question :Assertion :- Second trimester MTP is more complicated.Reason :- After 12 weeks foetus becomes intimately associated with the maternal tissue.
Answer» If both ASSERTION & Reason are True & the Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. ANSWER :A

Discussion

21032.	Question : Assertion : Saheli - the new oral contraceptive for females - contains a non-steroidal preparation. Reason : It is "once-a-week" pill with very few side-effects and high contraceptive value.
Answer» If both Assertion and Reason are TRUE but the reason is the correct explanation of the assertion, then mark (1). If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true but Reason is false, then mark (3). If both Assertion and Reason are false, then mark (4). ANSWER :B

Discussion

21033.	Question :Assertion . Salamander and Sphenodon are classified as reptiles.Reason. Their skinis naked, mosit and glandular.
Answer» if BOTHARE truewithreasonbeingcorrectexplanation bothtruereasonis NOTCORRECT EXPLANATION both truebut REASON iswrong and both are wrong Solution :N//A

Discussion

21034.	Question : Assertion :-Rower is the reproductive unit in the angiosperms. Reason :-It carries sex organs of plant.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False If both Assertion & Reason are false Answer :A

Discussion

21035.	Question : Assertion :- Root pressure is one of the positive pressure, which arise due to removal of water. Reason:- Root pressure is responsible for pulling up water to small heights in the stem.
Answer» If both ASSERTION and REASON are true and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false Answer :D

Discussion

21036.	Question : Assertion: Rotenone is a bioinsecticide.Reason: Rotenone is obtained from living organisms and is employed to kill bacteria.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

21037.	Question :Assertion :-Root hairs arise only in maturation region. Reason :-Root hairs absorb water and mineral from soil.
Answer» If both Assertion & Reason are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE If both Assertion & Reason are false Answer :B

Discussion

21038.	Question : Assertion :- Rods are not functional in red green blindness. Reason:- Use of carrot in diet cures red green blindness.
Answer» If both ASSERTION and reason are TRUE and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is FALSE. If both assertion and reason are false. Answer :D

Discussion

21039.	Question : Assertion Reserve pool of nutrient cycle nutrient cycle becomes emptied and filled repeatedly. Reason Filling and emiting of reserved pool is due to exchange between living and non-living components of biosphere.
Answer» Both ASSERTION and REASON are true and Reason is the cprrect explanation of Assertion Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion Assertion is true, but Reason is FALSE Assertion is false, but Reason is true Solution :Reserve pool of biogeochemical cycle is the RESERVIOR biogenetic nutrients.

Discussion

21040.	Question : Assertion :- Ring worm disease caused due to Round worm. Reason :- Muliple lymph nodes involve in ring worm.
Answer» If both Assertion & REASON are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :D

Discussion

21041.	Question : Assertion. Replication of DNA is perfect. Reason. Defect in DNA spoils the DNA.
Answer» If both ASSERTION and Reason are true and the Reason is a CORRECT explanation of the Assertion . If both Assertion and Reason are true but Reason is not a correct EXPLANATIONS of the Assertion If Assertion is true but the Reason is FALSE . If both Assertion and Reason are false. Answer :C

Discussion

21042.	Question : Assertion : Repetitive sequences make up very large portion of human genome. Reason : Repetitive sequences do not have direct coding functions in the genome.
Answer» If both ASSERTION and reason are true and reason is the correct explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :REPEATED or repetitive sequences make up a large portion of human genome. These sequences are nucleotide sequences that are repeated many TIMES. They have no direct coding function but PROVIDE information as to CHROMOSOME's structure, dynamics and evolution.

Discussion

21043.	Question : Assertion: 'Reindeer moss' is used by reindeer, caribou and other animals as fodder. Reason: reindeer moss is found in rainforests.
Answer» If both ASSERTION and Reason are true and the Reason is the correct EXPLANATION of the assertion. If both assertion and Reason are true but the reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution :Reindeer moss is FOUND in Tundra region.

Discussion

21044.	Question : Assertion: Recycling is the only solution for the treatment of e-waste, provided it is carried out in an environment friendly manner. Reason: During recycling process, metals like copper, iron, silicon, nickel and gold are recovered in developing countries.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution : Recycling is the only solution for the treatment of e -WASTE, provided it is carried out in an environment friendly manner. During recycling process, metals LIKE COPPER, iron, silicon, nickel and gold are RECOVERED in developing countries.

Discussion

21045.	Question : Assertion : Recycling of materials is must for the maintenance of biosphere . Reason : Because energy flows unidirctionally in a food chain.
Answer» If both ASSERTION and REASON are true and Reason is CORRECT explanation of Assertion. If both Assertion and Reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

21046.	Question : Assertion :- Reaction of P^4 with SO_2Cl_2 gives PCl_5. Reason :- d_(x^2-y^2) orbital participate in the hybridisation of PCl_5.
Answer» If both Assertion & Reason are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :C

Discussion

21047.	Question : Assertion: Ratio of complementary genes is 9:7.Reason: Ratio of supplementary genes is 9:3: 4.
Answer» If both Assertion and Reason are TRUE and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

21048.	Question : Assertion : Radioactive pollution may affect the future generation. Reason: Radioactive pollution causes mutations which can affect the progeny.(A) both .A. and .R. are true and .R. is the correct explanation of .A..(B) both .X. and .R. are true and .R. is not the correct explanation of .A..(C) .A. is true but .R. is false.(D) Both .A. and .R. are false.
Answer» both .A. and .R. are TRUE and .R. is the correct explanation of .A.. both .X. and .R. are true and .R. is not the correct explanation of .A.. .A. is true but .R. is false. Both .A. and .R. are false. Answer :A

Discussion

21049.	Question : Assertion: Rabbit is a herbivorous animal. Reason: Canines are absent in rabbit.
Answer» Both Assertion and Reason are TRUE and Reason is correct EXPLANATION of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is FALSE. Both Assertion and Reason are false. Solution :Both Assertion and Reason are true and Reason is correct explanation of Assertion.

Discussion

21050.	Question : Assertion: Protoplast fusion is one of the major advantages of tissue culture Reason: The naked protoplasts of two different plants fuse to form a hybrid.
Answer» If both ASSERTION and Reason are true and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the Reason is not the correct explanation of the assertion If assertion is true but the Reason are false If both Assertion and Reason are false Answer :B

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion. The ability of certain DNA sequence in the genome to move from one site to another, without any sequence relationship is called transposition Reason. The message from nuclear DNA for the synthesis of specific cytoplasmic protein is carried by m-RNA

Question : Assertion: Terrorist are trying to adopt bioweapons these days.Reason: Bioweapons are liked by terrorist organisation as these are costly.

Question : Assertion :- Tasmanian wolf and Placental wolf are the good example of convergent evolution. Reason :- More than one adaptive radiation apperared to have occured in an isolated geographical area, (representing different habitats) one can call this convergent evolution.

Question : Assertion. Temin modified Crick's ‘central dogma’ to ‘central dogma reverse.’ Reason. Crick was of the view that flow of genetic information in cells is bidirectional.

Question : Assertion : Template or antisense strand , having 3' rarr 5'polarity takes part in transcription. Reason : Non-template or sense strand, having 5' rarr3' polarity, does not take part in transcription.

Question : Assertion : Systematicsis the branch of biology that dealswith classificationof living organism . Reason : The aim of classification is to group the organismin an orderly manner.

Question : Assertion : Surgical methods of contraception are practiced to space two successive conceptions. Reason : During surgical methods, ovaries from females or testes from males are removed.

Question : Assertion : Synthesisof daughter or new srand accurs continuously along the parent 3' rarr 5'strand. Reason:DNA polymerase can polymerise nucleotides in 3' rarr 5' direction on 5' rarr 3' strand.

Question : Assertion :- Surgical methods is terminal method to prevent any more pregnency. Reason :- Surgical intervention blocks lumen of uterus there by prevent implantation.

Question : Assertion : Surgical method blocks gamete transport and thereby prevents conception. Reason : Surgical method used in males for this purpose is called vasectomy.

Question : Assertion : Subsequent encounter with the same pathogen elicits a highly intensified anamnestic response. Reason : This is based on the fact that our body appears to have memory of the first encounter.

Question : Assertion : Stigma of pistil receives the pollen during pollination. Reason: Pollen grains are produced in ovary of gynoecium.

Question : Assertion :- Sterilization is a terminal method used only for males. Reason :- This technique is highly effective and reversibility is good.

Question :Assertion :-Stems of maize and sugarcane have supporting roots. Reason :-Fibrous root system of maize and sugarcane can not anchor their large sized stem.

Question : Assertion : Sporopollenin preserves pollen in fossil deposits. Reason : Sporopollenin is resistant to physical and biological decomposition

Question : Assertion: Spermatogenesis occurs in the seminiferous tubules and testosterone secretion takes place in the interstitial cells of the testes. Reason: Growth and maturation of secondary sex organs and the development of accessory sex characters are brought out by testosterone.

Question : Assertion : Speed disposal by wind is called as anemochory. Reason : The seeds are light, minute and may be winged.

Question : Assertion: Somaclonal variations occur in tissue culture processes Reason: Variations cannot occur in nature.

Question : Assertion :- Solubility of alkali metal hydroxide increases on moving down the group. Reason :- On moving down the group, hydration energy increases and lattice energy decreases.

Question : Assertion: Soil erosion is also caused due to excessive water logging. Reason: By slipping of large boulders from a glacier, sheet erosion is caused.

Question : Assertion : Sexually transmitted diseases get transmitted from the infected to the normal person, only during sexual contact. Reason : All sexually transmitted diseases can be cured by antibiotics.

Question : Assertion: Skin ofleech is kept moist and slimy. Reason : It is due to secretion of mucus which also prevents it from drying

Question : Assertion: sinus venosus is a thin-walled sac with little muscular tissue in primitive heart. Reason: It receives venous blood through the hapatic veins.

Question : Assertion : Sickle-cell anaemia is an autosome-linked recessive disorder that can be transmitted if both parents are heterozygous for the gene Reason : In sickle-cell anaemia, haemoglobin molecule undergoes polymerisation under low oxygen tension causing the change in shape in RBC

Question : Assertion : Sex education in schools is not necessary. Reason: Sex education may increase certain myths and conceptions in the students.

Question : Assertion : Sewage, industrial effluents and waste water are non-point sources of water pollution. Reason : Surface runoff is point source of water pollution.

Question : Assertion :- Sensory neuron from toes to CNS is one of the longest nerve in the body Reason:- Sensory nerve form the synapse at both dendrites and axon terminals.

Question : Assertion . Seeds are found in gymnosperms and angiosperm .

Question : Assertion: Seeded plants are highly evolved. Reason : In spermatophyta, seeds are formed.

Question : Assertion: Sedatives are used in sleeping pills. Reason: Sedatives contain opiates which reduce tension and anxiety.

Question :Assertion :- Second trimester MTP is more complicated.Reason :- After 12 weeks foetus becomes intimately associated with the maternal tissue.

Question : Assertion : Saheli - the new oral contraceptive for females - contains a non-steroidal preparation. Reason : It is "once-a-week" pill with very few side-effects and high contraceptive value.

Question :Assertion . Salamander and Sphenodon are classified as reptiles.Reason. Their skinis naked, mosit and glandular.

Question : Assertion :-Rower is the reproductive unit in the angiosperms. Reason :-It carries sex organs of plant.

Question : Assertion :- Root pressure is one of the positive pressure, which arise due to removal of water. Reason:- Root pressure is responsible for pulling up water to small heights in the stem.

Question : Assertion: Rotenone is a bioinsecticide.Reason: Rotenone is obtained from living organisms and is employed to kill bacteria.

Question :Assertion :-Root hairs arise only in maturation region. Reason :-Root hairs absorb water and mineral from soil.

Question : Assertion :- Rods are not functional in red green blindness. Reason:- Use of carrot in diet cures red green blindness.

Question : Assertion Reserve pool of nutrient cycle nutrient cycle becomes emptied and filled repeatedly. Reason Filling and emiting of reserved pool is due to exchange between living and non-living components of biosphere.

Question : Assertion :- Ring worm disease caused due to Round worm. Reason :- Muliple lymph nodes involve in ring worm.

Question : Assertion. Replication of DNA is perfect. Reason. Defect in DNA spoils the DNA.

Question : Assertion : Repetitive sequences make up very large portion of human genome. Reason : Repetitive sequences do not have direct coding functions in the genome.

Question : Assertion: 'Reindeer moss' is used by reindeer, caribou and other animals as fodder. Reason: reindeer moss is found in rainforests.

Question : Assertion: Recycling is the only solution for the treatment of e-waste, provided it is carried out in an environment friendly manner. Reason: During recycling process, metals like copper, iron, silicon, nickel and gold are recovered in developing countries.

Question : Assertion : Recycling of materials is must for the maintenance of biosphere . Reason : Because energy flows unidirctionally in a food chain.

Question : Assertion :- Reaction of P^4 with SO_2Cl_2 gives PCl_5. Reason :- d_(x^2-y^2) orbital participate in the hybridisation of PCl_5.

Question : Assertion: Ratio of complementary genes is 9:7.Reason: Ratio of supplementary genes is 9:3: 4.

Question : Assertion: Rabbit is a herbivorous animal. Reason: Canines are absent in rabbit.

Question : Assertion: Protoplast fusion is one of the major advantages of tissue culture Reason: The naked protoplasts of two different plants fuse to form a hybrid.