24277 + Interview Questions in Biology in Class 12 Page 429 InterviewSolution

21401.	Question : Assertion : Biotechnology produces transgenic microorganism that function as microfactories for proteins Reason : Transgenic microorganisms can be developed to produce proteins of human use like insulin.
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 Solution :Transgenic microoganisms can be DEVELOPED by inserting genes encoding for desired PROTEIN products using recombinant DNA technology. These transgenic organisms recombinant DNA technology. These transgenic organisms function as living MICROFACTORIES that produce proteinslike HUMAN insulin, human growth hormone etc. Production of proteins from such organisms is easier, more efficient and cost effective.

Discussion

21402.	Question : Assertion Biopiracy is being resorted to by the coutries ofNorth Reason countries fo suth are incapable of biopeiracy
Answer» If both ASSERTION and Reason are true and the Reason is a correct EXPLANATION of the Assertion If both Assertion and Reason are ture but Reason is not a correct explanation of the Assertion If Assertion is true but the Reason is FALSE If both Assertion and Reason are false ANSWER :C

Discussion

21403.	Question : Assertion : Biological magnification is increase in concentration of toxic substances at various trophic levels of a food chain. Reason: Toxic substances accumulated by an organism cannot be metabolized or excreted.
Answer» both .A. and .R. are true and .R. is the CORRECT EXPLANATION of .A.. both .A. 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

21404.	Question :Assertion: Biofertilisers are preferred to chemical fertilisers.Reason: Most of the chemical fertilisers are expensive, hazardous and damage the environment.
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

21405.	Question : Assertion : Bharat stage IV emission norms have been in place since April 2010, for 4 wheelers in 13 mega cities of India. Reason : Green muffler scheme refers to the plantation of trees and shrubns along road sides and is effective to control noise pollution only.
Answer» Solution :Bharat stage emission standards are emission standards issued by the Government of India to regulate the emission of air pollutants from internal combusion engine equipments of motor vehicles. Bharat Stage IV norms have been in place for 4-wheelers in 13 mega cities of india (delhi and NCR, Mumbai, Kolkata, Chennai, BANGALORE, Surat, Kanpur, Agra, Lucknow and Sholapur) since April 2010. GREEN muffler or green belt vegetation is rows of trees and shrubs GROWN and maintained to serve as noise ABSORBERS. It also reduces air pollution because the trees and shrubs absorb pollution gases and cause settling of suspended particular matter.

Discussion

21406.	Question : Assertion : Best adapted and less adapted individuals reproduce at the same rate. Reason: Natural selection favour them equally.
Answer» If both Assertion and REASON are TRUE and Reason is a correct EXPLANATION of Assertion If both Assertion and Reason are true but Reason is not a correct explanation of Assertion. If Assertion is true but Reason is FALSE If both Assertion and Reason are false Solution :If both Assertion and Reason are false

Discussion

21407.	Question :Assertion: Best adapted and less adapted individuals reproduce at the same rate. Reason: Natural selection favour them equally.
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 :D

Discussion

21408.	Question : Assertion : Baculovirus are biocontrol agents of genus nucleopolyhedrovirus. Reason : They are effective against plant pathogens
Answer» WITHOUT fertilisation DIPLOID EMBRYO forms With fertilisation diploid embryo forms Without fertilisation HAPLOID embryo cell form embryo With fertilisation haploid embryo cell form embryo Answer :B

Discussion

21409.	Question : Assertion : Bacillus anthracis exemplifies how biotechnology can be used for destructive processes Reason : The spores of anthrax bacterium were spread via letters in the form of powder.
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 :B

Discussion

21410.	Question :Assertion :- B and C form their stable halidess as BX_3 and CX_4, while Tl and Pb produce their stable halides as TlX and PbX_2. Reason :- Both PbX_4 and TlX_3 are strong reducing agent.
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

21411.	Question : Assertion: 'Bť toxin gene has been cloned from bacteria and expressed in plants to provide resistance from insect without the need of insecticides.Reason: 'Bť toxin is produced from bacterium Bacillus thuringiensis.
Answer» ANSWER :A

Discussion

21412.	Question : Assertion (A):The organism which undergoes mutation is called a mutant. Reason ( R): It is a common method of creating genetic variation,Which brings about changes in the organism.
Answer» Both ASSERTION ANDREASON are TRUE and REASON is not correct EXPLANATION of Assertion. Both Assertion and Reason are true but Reason isthe 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 explanationof Assertion

Discussion

21413.	Question : Assertion :-Axillary buds represent storage of lateral meristem. Reason :-Axillary buds are responsible for the production of lateral secondary 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 :D

Discussion

21414.	Question : Assertion: Azolla pinnata is used as biofertiliser in rice cultivation.Reason: Azolla performs nitrogen fixation with the help of symbiotic bacteria Bacillus sp.
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

21415.	Question : Assertion : At climax stage , perfect equilibrium between abiotic and biotic components area cannot be observed. Reason: This is due to autogenic and allogenic succession.
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 :D

Discussion

21416.	Question : Assertion : As the amount of dissolved oxygen in water decreases, BOD increases. Reason: Microorganisms involved in biodegradation of organic matter requires a lot of dissolved O_(2).
Answer» both .A. and .R. are TRUE and .R. is the CORRECT EXPLANATION of .A.. both .A. 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

21417.	Question : Assertion: Artificial insemination breeding technique is better than natural breeding. Reason: In induced breeding, the ovulation is stimulated by hypophysation
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

21418.	Question : Assertion: Apis mellifera species of honeybees is commonly used for apiculture. Reason: Apis mellifera is very docile, highyielding and less swarming
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 :A

Discussion

21419.	Question : Assertion: Aquatic plants contain aerenchyma. Reason: Aerenchyma keeps aquatic plants afloat.
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 true and the Reason is the correct explanation of the Assertion.

Discussion

21420.	Question : Assertion (A):Plasmodium vivax is a digenuc parasite Reason (R ):The primary host of P.Vivax is man .
Answer» Both (A) and (R are TRUE .(R) explains(A) (A) is true (R ) is FALSE Both(A) is true (R ) are FLASE (A) is false (R ) is true Answer :A

Discussion

21421.	Question :Assertion :- Annual rings donot provide accurate estimation of age of plants.Reason :-Sometimes false annual rings can also arise due to mechanical pressure and jerks.
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

21422.	Question : Assertion :- Any population has built in variation in characteristics. Reason :- Variations are always stable and inheritable.
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 :C

Discussion

21423.	Question : Assertion : Annual growth rate of Indian population has declined from 2.22% in 1981 to 1.8% in 2001. Reason: More and more Indians are shirking from adopting family planning measures.
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 :C

Discussion

21424.	Question : Assertion: Animals adopt different strategies to survive in hostile environment. Reason: Praying mantis is green in colour which merges with plant foliage.
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 true and the Reason is not the correct explanation of the Assertion.

Discussion

21425.	Question : Assertion (A): In bee society, all the members are diploid, except drones. Reason (R): Drones are produced by parthenogenesis.
Answer» If both A and R are true and R is correct EXPLANATION for A If both A and R are true but R is not the correct explanation for A If A is true but R is false If both A and R are false Solution :(I) A (II) A (III) C

Discussion

21426.	Question : Assertion: An interspecific hybrid of the male ass and the mare is a sterile mule. Reason: Mule is inferior to the parents as a beast of burden.
Answer» If both Assertion and REASON are TRUE and Reason is the correct EXPLANATION of Assertion If both Assertion and Reason are true, Reason is not the correct explanation of Assertion Assertion is true, but the Reason is false Assertion is false, but the Reason is true Solution :A mule is a hybrid of male donkey (jacks) and a female horse (MARE) . The hyrid from the reciprocal cross is called hinny. Mule shows hybrid vigour. They are sterile , larger than thedonkeys and sturdier than the horeses.

Discussion

21427.	Question : Assertion: Anabaena is commonly called a symbiotic biofertiliser.Reason: Anabaena is found as endosymbiont in the thallus of Anthoceros.
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

21428.	Question : Assertion : An equilibrium is established is istablished between generation and destruction of ozone, leading to a steady state concentration of ozone layer in the stratosphere at an altitude of 20-30 km above sea level. Reason : The thickness of the ozone layer is generally larger above the equator and smaller above the poles.
Answer» SOLUTION :N//A

Discussion

21429.	Question : Assertion : An electrostatic precipitator (ESP) is a particulate collection device that removes dust and smoke particles from flowing air using the force of an induced electrostatic charge. Reason : An ESP is a highly efficient device as it removes 99 percent of particulate matter present in the exhaust from a thermal power plant.
Answer» SOLUTION :N//A

Discussion

21430.	Question : Assertion: An elephant is used in food uptake. Reason: Tusk of elephant is used in food uptake.
Answer» Both Assertion and Reason are true and Reason is the 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 Assertion is false, but Reason is true Solution :Some teeth have BECOME so highly modified that they are no longer useful for biting or chewing food. An elephant's tusk is a MODIFICATION of UPPER incisor, which is used for defence, attack, ETC.

Discussion

21431.	Question : Assertion. An amino acid in polypeptide chain is not altered due to change in third base of codon. Reason. It is due to Wobble hypothesis.
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 :A

Discussion

21432.	Question : Assertion: Among the primates, chimpanzee is the closest relative of modern man. Reason: The banding pattern in the autosome number 3 and 6 of man and chimpanzee is remarkably similar.
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

21433.	Question : Assertion: Amnocentesis is banned. Reason: Amniocentesis gives information about foetal abnormalities.
Answer» SOLUTION :Amniocentesis is BANNED. Amniocentesis GIVEN information about FOETAL abnormalities.

Discussion

21434.	Question : Assertion: Amphibians have evolved from fishes. Reason: Archaeopteryx is a fossil linking fishes and amphibians.
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

21435.	Question : Assertion:-Alstonia show whorled phyllotaxy, Reason :-In Alstonia one leaf arises on each node.
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

21436.	Question : Assertion :- Alstonia show whorled phyllotaxy, Reason :- In Alstonia one leaf arises on each node.
Answer» If both Assertion & REASON are TRUE & Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are false. Answer :C

Discussion

21437.	Question : Assertion : Alpine frosts consist of dwarf shrubs mainly of junipers , silver firs and Rhododendrons. Reason : Alpine forests occur in Himalayas above the altitude of 3500 metres.
Answer» If both ASSERTION and REASON are TRUE and Reason is CORRECT EXPLANATION of Assertion. If both Assertion and Reason are true and reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

21438.	Question : Assertion : Alleles can transmit from parents to progeny without variations. Reason : Alleles of different genes could be linked.
Answer» Both A and R are TRUE and R is the 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 and R are false Answer :B

Discussion

21439.	Question : Assertion : All motor neurons nerve impulses from the spinal cord to the brain. Reason : Motor neurons conduct nerve impulses from the spinal cord to the brain.
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

21440.	Question : Assertion: All the events of sexual reproduction prior to the fusion of gametes includes in the post -fertilisation events.
Answer» Solution :All the EVENTS of sexual reproduction prior to the fusion of gametes INCLUDES in the pre-fertilisation events. Pre-fertilisation EVENT includes gametogensis and gamete TRANSFER.

Discussion

21441.	Question : Assertion: All the living organisms have certain basic similarities. Reason: The living organisms have monophyletic ancestory.
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

21442.	Question : Assertion: All the animals have three germ layers in their development Reason:all the animals are triploblastic.
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 :D

Discussion

21443.	Question : Assertion: All embryo with 8 to 16 blastomeres is called a morula. Reason: The morula containues to divide and transforms into trophoblast.
Answer» Solution :The embryo with 8 to 16 blastomeres is called a morula. The morula continues to divide and transforms into blastocyst as it moves further into the uterus. The blastomeres in the blastocyst are ARRANGED into an outer layer called trophoblast and an inner GROUP of cells ATTACHED to trophoblast called the inner cell mass.

Discussion

21444.	Question :Assertion :- All diamagnetic species are colorless Reason :- All paramagnetic species are colorful.
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

21445.	Question : Assertion: All copulations do not lead to the fertilisation and pregnancy. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.
Answer» Solution :FERTILISATION can only OCCUR if the ovum and sperms are tranported SIMULTANEOUSLY to the ampullary-isthmic JUNCTION and ovum is released only once a month. This is one of the reasons why all copulations do not LEAD to fertilisation and pregnancy.

Discussion

21446.	Question : Assertion: Air layering is commonly done in woody shrubs and tress. Reason : They do not bear the bending branches near the ground.
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

21447.	Question : Assertion: Alcohol is called a stimulant. Reason: Alcohol is immediately oxidised to produce large amount of energy which increases the activities of CNS.
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 :D

Discussion

21448.	Question : Assertion: Alcoholism generally leads to fatty acid syndrome, called cirrhosis. Reason: In liver, alcohol changes into acetaldehyde which stimulates the synthesis of fats from alcohol.
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

21449.	Question : Assertion: AIDS spreads more rapidly than hepatitis.Reason: HIV has shorter incubation period than that of HBV.
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 :D

Discussion

21450.	Question : Assertion : AIDS is infectious disease whichis fatal . Reason: Cancer is a non- infectious disease andis major cause of death.
Answer» If both assertionand reasonare true and THEREASON is the correct explanation of theassertion. If both assertion and reasonare true but reason is not the correctexplanation of theassertion. If assertion is true but reasonis false. If bothassertionand reason are false. Solution :AIDS is infectious disease whichis fatal. Cancer is a non-infectious disease and is MAJOR cause of DEATH.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion : Biotechnology produces transgenic microorganism that function as microfactories for proteins Reason : Transgenic microorganisms can be developed to produce proteins of human use like insulin.

Question : Assertion Biopiracy is being resorted to by the coutries ofNorth Reason countries fo suth are incapable of biopeiracy

Question : Assertion : Biological magnification is increase in concentration of toxic substances at various trophic levels of a food chain. Reason: Toxic substances accumulated by an organism cannot be metabolized or excreted.

Question :Assertion: Biofertilisers are preferred to chemical fertilisers.Reason: Most of the chemical fertilisers are expensive, hazardous and damage the environment.

Question : Assertion : Bharat stage IV emission norms have been in place since April 2010, for 4 wheelers in 13 mega cities of India. Reason : Green muffler scheme refers to the plantation of trees and shrubns along road sides and is effective to control noise pollution only.

Question : Assertion : Best adapted and less adapted individuals reproduce at the same rate. Reason: Natural selection favour them equally.

Question :Assertion: Best adapted and less adapted individuals reproduce at the same rate. Reason: Natural selection favour them equally.

Question : Assertion : Baculovirus are biocontrol agents of genus nucleopolyhedrovirus. Reason : They are effective against plant pathogens

Question : Assertion : Bacillus anthracis exemplifies how biotechnology can be used for destructive processes Reason : The spores of anthrax bacterium were spread via letters in the form of powder.

Question :Assertion :- B and C form their stable halidess as BX_3 and CX_4, while Tl and Pb produce their stable halides as TlX and PbX_2. Reason :- Both PbX_4 and TlX_3 are strong reducing agent.

Question : Assertion: 'Bť toxin gene has been cloned from bacteria and expressed in plants to provide resistance from insect without the need of insecticides.Reason: 'Bť toxin is produced from bacterium Bacillus thuringiensis.

Question : Assertion (A):The organism which undergoes mutation is called a mutant. Reason ( R): It is a common method of creating genetic variation,Which brings about changes in the organism.

Question : Assertion :-Axillary buds represent storage of lateral meristem. Reason :-Axillary buds are responsible for the production of lateral secondary tissue.

Question : Assertion: Azolla pinnata is used as biofertiliser in rice cultivation.Reason: Azolla performs nitrogen fixation with the help of symbiotic bacteria Bacillus sp.

Question : Assertion : At climax stage , perfect equilibrium between abiotic and biotic components area cannot be observed. Reason: This is due to autogenic and allogenic succession.

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

Question : Assertion: Artificial insemination breeding technique is better than natural breeding. Reason: In induced breeding, the ovulation is stimulated by hypophysation

Question : Assertion: Apis mellifera species of honeybees is commonly used for apiculture. Reason: Apis mellifera is very docile, highyielding and less swarming

Question : Assertion: Aquatic plants contain aerenchyma. Reason: Aerenchyma keeps aquatic plants afloat.

Question : Assertion (A):Plasmodium vivax is a digenuc parasite Reason (R ):The primary host of P.Vivax is man .

Question :Assertion :- Annual rings donot provide accurate estimation of age of plants.Reason :-Sometimes false annual rings can also arise due to mechanical pressure and jerks.

Question : Assertion :- Any population has built in variation in characteristics. Reason :- Variations are always stable and inheritable.

Question : Assertion : Annual growth rate of Indian population has declined from 2.22% in 1981 to 1.8% in 2001. Reason: More and more Indians are shirking from adopting family planning measures.

Question : Assertion: Animals adopt different strategies to survive in hostile environment. Reason: Praying mantis is green in colour which merges with plant foliage.

Question : Assertion (A): In bee society, all the members are diploid, except drones. Reason (R): Drones are produced by parthenogenesis.

Question : Assertion: An interspecific hybrid of the male ass and the mare is a sterile mule. Reason: Mule is inferior to the parents as a beast of burden.

Question : Assertion: Anabaena is commonly called a symbiotic biofertiliser.Reason: Anabaena is found as endosymbiont in the thallus of Anthoceros.

Question : Assertion: An elephant is used in food uptake. Reason: Tusk of elephant is used in food uptake.

Question : Assertion. An amino acid in polypeptide chain is not altered due to change in third base of codon. Reason. It is due to Wobble hypothesis.

Question : Assertion: Among the primates, chimpanzee is the closest relative of modern man. Reason: The banding pattern in the autosome number 3 and 6 of man and chimpanzee is remarkably similar.

Question : Assertion: Amnocentesis is banned. Reason: Amniocentesis gives information about foetal abnormalities.

Question : Assertion: Amphibians have evolved from fishes. Reason: Archaeopteryx is a fossil linking fishes and amphibians.

Question : Assertion:-Alstonia show whorled phyllotaxy, Reason :-In Alstonia one leaf arises on each node.

Question : Assertion :- Alstonia show whorled phyllotaxy, Reason :- In Alstonia one leaf arises on each node.

Question : Assertion : Alpine frosts consist of dwarf shrubs mainly of junipers , silver firs and Rhododendrons. Reason : Alpine forests occur in Himalayas above the altitude of 3500 metres.

Question : Assertion : Alleles can transmit from parents to progeny without variations. Reason : Alleles of different genes could be linked.

Question : Assertion : All motor neurons nerve impulses from the spinal cord to the brain. Reason : Motor neurons conduct nerve impulses from the spinal cord to the brain.

Question : Assertion: All the events of sexual reproduction prior to the fusion of gametes includes in the post -fertilisation events.

Question : Assertion: All the living organisms have certain basic similarities. Reason: The living organisms have monophyletic ancestory.

Question : Assertion: All the animals have three germ layers in their development Reason:all the animals are triploblastic.

Question : Assertion: All embryo with 8 to 16 blastomeres is called a morula. Reason: The morula containues to divide and transforms into trophoblast.

Question :Assertion :- All diamagnetic species are colorless Reason :- All paramagnetic species are colorful.

Question : Assertion: All copulations do not lead to the fertilisation and pregnancy. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

Question : Assertion: Air layering is commonly done in woody shrubs and tress. Reason : They do not bear the bending branches near the ground.

Question : Assertion: Alcohol is called a stimulant. Reason: Alcohol is immediately oxidised to produce large amount of energy which increases the activities of CNS.

Question : Assertion: Alcoholism generally leads to fatty acid syndrome, called cirrhosis. Reason: In liver, alcohol changes into acetaldehyde which stimulates the synthesis of fats from alcohol.

Question : Assertion: AIDS spreads more rapidly than hepatitis.Reason: HIV has shorter incubation period than that of HBV.

Question : Assertion : AIDS is infectious disease whichis fatal . Reason: Cancer is a non- infectious disease andis major cause of death.