24277 + Interview Questions in Biology in Class 12 Page 428 InterviewSolution

21351.	Question : Assertion : Cross pollination in true genetic sense within species is called xenogamy. Reason: When there is cross pollination, resultant hybrid is a combination of characters of two plants.
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

21352.	Question : Assertion : 'Cry' proteins are named so because they are crystal proteins Reason : 'Cry' proteins are solubilised is acidic environment of insect midgut and then release toxic core fragments after proteolytic action.
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 :The cry gene of Bacillus thuringiensis produces a protein, which FORMS crystalline inclusions (i.e., is crystal in nature) in the bacterial spores. These proteins are named 'cry' proteins due to their crystal nature and are responsible for the insecticidal activities of the bacterial strains 'Cry' proteins are solubilised in alkaline environment of insect migut. Then these proteins undergo proteolytic digestion to release core toxic fragments. These toxins bind to receptors in brush membrane developd pores. most likely non-specific in nature and CAUSE influx of IONS and water into the CELLS resulting in their swelling and eventually LYSIS.

Discussion

21353.	Question : Assertion: Copper-T is an effective contraceptive device in human females. Reason: Copper-T prevents passage of sperms from vagina upwards into Fallopian tubes.
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

21354.	Question : Assertion: Copper-T is an effectie contraceptive device in human females. Reason: Copper-T prevents passage of sperms from vagina upwards into fallopian tubes.
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 the assertion is true but reason is FALSE. If both the assertion and RESSON are false. ANSWER :C

Discussion

21355.	Question : Assertion :- Conversion of nitrate to ammonia takes place in leaves while conversion ofNO _(3) ^(-) in to N_(2) takes place in soil. Reason:- Enzymes of nitrate assimilation found in leaves, while denitrifying bacteria are restricted in soil.
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 :A

Discussion

21356.	Question : Assertion : Contribuition of CO_(2), CH_(4), CFCs " and " N_(2)O towards greenhouse effect is respectively 60%, 6 %, 14 % and 20 %. Reason : Greenhouse gases are radioactively active gases which prevent the short wavelength radiations emitted by earth to escape into space.
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 :The gases which are transparent to solar radiation but retain and partially reflect back long wave heat RADIATIONS are called greenhouse gases (GHGs). Greenhouse gases are essential for keeping the earth warm and hospitable. The various greenhouse gases are `CO_(2)` (warming EFFECT 60%) , `CH_(4)` (effect 20%), CHLOROFLUOROCARBONS or CFCs (14%) and nitrous oxide `(N_(2)O, 6%)`. Others of minor significance are water VAPOURS and ozone.

Discussion

21357.	Question : Assertion : Continued use of eyes leads to an improvement of eyesight. Reason : Isolating mechanisms prevent reproduction even between the members of same species.
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

21358.	Question : Assertion: Continued use of eyes leads to an improvement of eyesight. Reason: Isolating mechanisms prevent reproduction even between the members of same species.
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

21359.	Question : Assertion : Continued self pollination generation after generation results in pure line formation Reason: By continued self-pollination, plant becomes pure or homozygous for its characters.
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

21360.	Question : Assertion. Constitutive genes are also known as house keeping genes Reason. Constitutive genes fail to express, as their products are not required for essential normal activities.
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

21361.	Question : Assertion : Consumers are not essential for a biotic community . Reason : Producers and reducers can maintain a biotic community .
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 but R is false . If both A and R are are false . Answer :B

Discussion

21362.	Question : Assertion : Compressed natural gas (CNG) is natural gas under pressure and mainly composed of methane. Reason : One of the advantages of using CNG as a fuel in automobiles is that it requires very less space for storage as compared to that of petrol or diesel.
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 :Comptessed natural GAS (CNG), is made by compressing natural gas (which is mainly compsed of methane, `CH_(4)`). It is a better fuedl tan petrol or diesel as its combustion produces fewer undesirable gases that petrol or diesel. The cost and placement of fuel storage tanks is the major BARRIER to wider adoption of CNG as a fuel. CNG vehicles REQUIRE a great amount of space for fuel storage than conventional gasoline powered vehicles. Laying down pipelines to deliver CNG through distribution points/pumps is another difficulty faced in switching over to CNG as an automobile fuel.

Discussion

21363.	Question : Assertion : Complementary pairing between nucleotides is used to diagnose presence of a specific DNA segment in a mixture Reason : DNA probes having radioactive isotoped help to detect DNA by autoradiography.
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

21364.	Question : Assertion : Colon bacilli can be used to produce glycoproteins that can be used fot hepatitis B treatment Reason : Hepatitis B is a viral disease and its spread in the body can be checked using interferons.
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 :Interferons are antiviral glycoproteins (called cytokines) that function as immune regulators or lymphokines produced by the INFECTED cell in response to viral infections. Until recently the only source of interferons was human white blood cells or virus infected human cells grown in TISSUE CULTURE. Now a days, colon bacilli can be GENETICALLY engineered to produce human interferons. These interferons (particularly `IFN alpha`) are USED significantly fir the treatment of hepatitis B. They are also being tested for the treatment of cancer and some viral diseases including AIDS.

Discussion

21365.	Question : Assertion : Competitive inhibition is also called substrate analogue Reason : It resembles the enzyme in structure.
Answer» if both are TRUE with REASON being CORRECT explanation both truebut reason is NOTCORRECT explanation assertion true but reason is WRONG and both are wrong Solution :N//A

Discussion

21366.	Question : Assertion: Cold-blooded animals have no fat layer. Reason: Cold-blooded animals use their fat for metabolic processes during hibernation.
Answer» (a) If both ASSERTION and REASON are true and the Reason is the CORRECT EXPLANATION of the Assertion. (b) If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. (c) If Assertion is true but the Reason is false (d) 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

21367.	Question : Assertion: Coacervates are believed to be the precursors of life. Reason: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
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

21368.	Question : Assertion : CO_2 and methane are called greenhouse gases. Reason : These - radiate heat and radiations cause global warming.
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 :A

Discussion

21369.	Question : Assertion : Clonesare a group of organism of identical genotype, produced by same kind of sexual reproduction and same sexualprocesses . Reason : Theseare prepared by a group of cells descendedfrom many cells or by inbreeding of a completely heterozygous line .
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 :Clone is a group of cells descended from the same singleparent CELL. In mostof the causes , NUCLEIC acid sequencesare said to be cloned when they are inserted into vectors such as plamis and copied within host cells during gene manipulation .

Discussion

21370.	Question :Assertion :- Clouds which have droplets of water with a gt gtlamdaare generally white (a = size of droplet) Reason :- For a gt gtladmaall wavelengths are scattered nearly equally.
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

21371.	Question : Assertion : City noise is sufficient to deafen people. Reason : Noise level above 80 decibels gradually leads to permanent loss of hearing ability.
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 :C

Discussion

21372.	Question : Assertion: Citrullus vulgaris is produced from a cross between 4n male and 2n female plants. Reason: These triploid sterile plants do not bear seeds.
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

21373.	Question : Assertion :-(CH_3)_ 3 Si -OHis moreacidicthan( CH _ 3 ) _ 3 C -OH Reason:-( CH _ 3 )_ 3 Si-overset(ϴ) Ohasbackbonding.
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

21374.	Question : Assertion :- Charles Robert Darwin strongly challanged the ideas of special creation theory. Reason :- Darwin was influenced by idea of use and desuse of lamarck
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

21375.	Question : Assertion: Chemical fertilisers and pesticides are not only expensive but also pose environmental hazards.Reason: Any mismanagement during application of chemical fertilisers and pesticides is likely to cause damage not only to crops but also to man.
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

21376.	Question : Assertion: Cervix contains the largest and the most powerful sphincter muscle in the body. Reason: Cervix opens into the vagina by external OS.
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

21377.	Question : Assertion: Census is held in India after every ten years. Reason: Scientific study of population is called demography
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

21378.	Question : Assertion: Cattle breeds can be improved by superovulation and embryo transfer. Reason: Superovulation in high milk-yielding cows is induced by hormonal injections.
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

21379.	Question : Assertion: Cataract is the condition on which lens become completely opaque. Reason: In this condition, a person can see only near objects.
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 :In CATARACT, cells in the lens DEGENERATE. A person can see only near objects in myopia.

Discussion

21380.	Question : Assertion: Cattle feed should contain both roughage and concentrate. Reason: Roughage of feed provides nutrients, while concentrate of food contains fibres
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

21381.	Question : Assertion: Catfishes are the best culturable fishes. Reason: Catfishes survive even at high temperature and low oxygen.
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 assertion is False but the Reason is true Answer :D

Discussion

21382.	Question : Assertion Caryopsis fruits differ from typical achenes with respect to the fusion of pericarp with the seed-coat (testa). Reason Caryopsis fruits commonly occur in the members of family-Poaceae.
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 the correct explanation of A A is true, but R is false A and R are false Solution :Caryopsis and achenes develop from monocarpollary unilocular, one-seeded and SUPERIOR ovaries. The only DIFFERENCE in them is that, in caryopsis, pericarp and seed coat are fused. Caryopsis is common in Poaceae FAMILY.

Discussion

21383.	Question : Assertion: Cancer is generally associated with a tumour. Reason: Cancerous cells undergo uncontrolled growth and division.
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

21384.	Question : Assertion :- Calculation of the net gain of ATP for every glucose molecule oxidised, is a theoretical calculation. Reason:- Owing breakdown of glucose sequential orderly functioning of pathway is not necessary.
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 :A

Discussion

21385.	Question : Assertion: By suction pressure method, flowers can be emasculated. Reason: Emasculation increases the chances of self-pollination.
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

21386.	Question : Assertion :- Bud is present in axil of petiole in both simple and compound leaf, but not in axil of leaflets of compound leaf. Reason :-Buds do not arise in the axil of leaflets .
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 :A

Discussion

21387.	Question : Assertion:- Bud is present in axil of petiole in both simple and compound leaf, but not in axil of leaflets of compound leaf. Reason :- Buds do not in the axil of leaflets.
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

21388.	Question : Assertion: Bryophytes are not a successul land plants. Reason: In bryophytes there is lack of vascular system.
Answer» If both assertion and REASON are true and the reason is a CORRECT EXPLANATION of the assertion. If both Assertion and Reason are truebut 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 :A

Discussion

21389.	Question : Assertion: Breaking of rocks is called weathering. Reason: Weathering of rocks is due to physical and chemical methods.
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

21390.	Question :Assertion :-Both tracheids and vessels are devoid of protoplasm. Reason :-Both tracheids and vessels have to produce physical forces for ascent of sap so death of protoplasm is prerequisite.
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

21391.	Question : Assertion : Both mule and hinny are sterline . Reason : These are the examples of hybrid sterility.
Answer» If both Assertion and Reason are TRUE and 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

21392.	Question :Assertion :-Both apical and intercalary meristems are primary meristem. Reason :-They appear early in life of plant and contribute to the formation of primary plant body.
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

21393.	Question : Assertion :- Boron is one of the essential micro element or trace element. Reason:- Boron is needed in small amount between 10 to 100 m mole kg-1 of dry matter.
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

21394.	Question : Assertion :- Bondorderfor bothNO ^+andNO ^-is 2.5. Reason:-NO ^+is lessstablethanNO ^-
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

21395.	Question :Assertion :- Bond energy of F_2 is less than Cl_2. Reason :- Bond length of F_2 is smaller than Cl_2.
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

21396.	Question : Assertion: BOD indicates the extent of water pollution by organic wastes.Reason: Increase in BOD decreases dissolved oxygen of wastewater.
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

21397.	Question :Assertion : BOD indicates the extent of water pollution by organic wastes. Reason: Increase in BOD decrease dissolved oxygen of waste water.
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 It Assertion and true but Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

21398.	Question : Assertion :- Biopiracy refers to the use of bioresources by multinational companies without proper authorization from the countries. Reason :- The Indian govemment has set up GEAC to prevent biopiracy.
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

21399.	Question :Assertion :- Bird flying high up in air does not cast shadow on the earth ground. Reason :- The size of bird is smaller than sun and sun is an extended source of light.
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

21400.	Question : Assertion: Biotic community hashigher position than population in ecological hierarchy. Reason: Population of similar individuals remains isolated in the community.
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 the assertion is true but reason is false. If both the assertion and reason are false. Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion : Cross pollination in true genetic sense within species is called xenogamy. Reason: When there is cross pollination, resultant hybrid is a combination of characters of two plants.

Question : Assertion : 'Cry' proteins are named so because they are crystal proteins Reason : 'Cry' proteins are solubilised is acidic environment of insect midgut and then release toxic core fragments after proteolytic action.

Question : Assertion: Copper-T is an effective contraceptive device in human females. Reason: Copper-T prevents passage of sperms from vagina upwards into Fallopian tubes.

Question : Assertion: Copper-T is an effectie contraceptive device in human females. Reason: Copper-T prevents passage of sperms from vagina upwards into fallopian tubes.

Question : Assertion :- Conversion of nitrate to ammonia takes place in leaves while conversion ofNO _(3) ^(-) in to N_(2) takes place in soil. Reason:- Enzymes of nitrate assimilation found in leaves, while denitrifying bacteria are restricted in soil.

Question : Assertion : Contribuition of CO_(2), CH_(4), CFCs " and " N_(2)O towards greenhouse effect is respectively 60%, 6 %, 14 % and 20 %. Reason : Greenhouse gases are radioactively active gases which prevent the short wavelength radiations emitted by earth to escape into space.

Question : Assertion : Continued use of eyes leads to an improvement of eyesight. Reason : Isolating mechanisms prevent reproduction even between the members of same species.

Question : Assertion: Continued use of eyes leads to an improvement of eyesight. Reason: Isolating mechanisms prevent reproduction even between the members of same species.

Question : Assertion : Continued self pollination generation after generation results in pure line formation Reason: By continued self-pollination, plant becomes pure or homozygous for its characters.

Question : Assertion. Constitutive genes are also known as house keeping genes Reason. Constitutive genes fail to express, as their products are not required for essential normal activities.

Question : Assertion : Consumers are not essential for a biotic community . Reason : Producers and reducers can maintain a biotic community .

Question : Assertion : Compressed natural gas (CNG) is natural gas under pressure and mainly composed of methane. Reason : One of the advantages of using CNG as a fuel in automobiles is that it requires very less space for storage as compared to that of petrol or diesel.

Question : Assertion : Complementary pairing between nucleotides is used to diagnose presence of a specific DNA segment in a mixture Reason : DNA probes having radioactive isotoped help to detect DNA by autoradiography.

Question : Assertion : Colon bacilli can be used to produce glycoproteins that can be used fot hepatitis B treatment Reason : Hepatitis B is a viral disease and its spread in the body can be checked using interferons.

Question : Assertion : Competitive inhibition is also called substrate analogue Reason : It resembles the enzyme in structure.

Question : Assertion: Cold-blooded animals have no fat layer. Reason: Cold-blooded animals use their fat for metabolic processes during hibernation.

Question : Assertion: Coacervates are believed to be the precursors of life. Reason: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.

Question : Assertion : CO_2 and methane are called greenhouse gases. Reason : These - radiate heat and radiations cause global warming.

Question : Assertion : Clonesare a group of organism of identical genotype, produced by same kind of sexual reproduction and same sexualprocesses . Reason : Theseare prepared by a group of cells descendedfrom many cells or by inbreeding of a completely heterozygous line .

Question :Assertion :- Clouds which have droplets of water with a gt gtlamdaare generally white (a = size of droplet) Reason :- For a gt gtladmaall wavelengths are scattered nearly equally.

Question : Assertion : City noise is sufficient to deafen people. Reason : Noise level above 80 decibels gradually leads to permanent loss of hearing ability.

Question : Assertion: Citrullus vulgaris is produced from a cross between 4n male and 2n female plants. Reason: These triploid sterile plants do not bear seeds.

Question : Assertion :-(CH_3)_ 3 Si -OHis moreacidicthan( CH _ 3 ) _ 3 C -OH Reason:-( CH _ 3 )_ 3 Si-overset(ϴ) Ohasbackbonding.

Question : Assertion :- Charles Robert Darwin strongly challanged the ideas of special creation theory. Reason :- Darwin was influenced by idea of use and desuse of lamarck

Question : Assertion: Chemical fertilisers and pesticides are not only expensive but also pose environmental hazards.Reason: Any mismanagement during application of chemical fertilisers and pesticides is likely to cause damage not only to crops but also to man.

Question : Assertion: Cervix contains the largest and the most powerful sphincter muscle in the body. Reason: Cervix opens into the vagina by external OS.

Question : Assertion: Census is held in India after every ten years. Reason: Scientific study of population is called demography

Question : Assertion: Cattle breeds can be improved by superovulation and embryo transfer. Reason: Superovulation in high milk-yielding cows is induced by hormonal injections.

Question : Assertion: Cataract is the condition on which lens become completely opaque. Reason: In this condition, a person can see only near objects.

Question : Assertion: Cattle feed should contain both roughage and concentrate. Reason: Roughage of feed provides nutrients, while concentrate of food contains fibres

Question : Assertion: Catfishes are the best culturable fishes. Reason: Catfishes survive even at high temperature and low oxygen.

Question : Assertion Caryopsis fruits differ from typical achenes with respect to the fusion of pericarp with the seed-coat (testa). Reason Caryopsis fruits commonly occur in the members of family-Poaceae.

Question : Assertion: Cancer is generally associated with a tumour. Reason: Cancerous cells undergo uncontrolled growth and division.

Question : Assertion :- Calculation of the net gain of ATP for every glucose molecule oxidised, is a theoretical calculation. Reason:- Owing breakdown of glucose sequential orderly functioning of pathway is not necessary.

Question : Assertion: By suction pressure method, flowers can be emasculated. Reason: Emasculation increases the chances of self-pollination.

Question : Assertion :- Bud is present in axil of petiole in both simple and compound leaf, but not in axil of leaflets of compound leaf. Reason :-Buds do not arise in the axil of leaflets .

Question : Assertion:- Bud is present in axil of petiole in both simple and compound leaf, but not in axil of leaflets of compound leaf. Reason :- Buds do not in the axil of leaflets.

Question : Assertion: Bryophytes are not a successul land plants. Reason: In bryophytes there is lack of vascular system.

Question : Assertion: Breaking of rocks is called weathering. Reason: Weathering of rocks is due to physical and chemical methods.

Question :Assertion :-Both tracheids and vessels are devoid of protoplasm. Reason :-Both tracheids and vessels have to produce physical forces for ascent of sap so death of protoplasm is prerequisite.

Question : Assertion : Both mule and hinny are sterline . Reason : These are the examples of hybrid sterility.

Question :Assertion :-Both apical and intercalary meristems are primary meristem. Reason :-They appear early in life of plant and contribute to the formation of primary plant body.

Question : Assertion :- Boron is one of the essential micro element or trace element. Reason:- Boron is needed in small amount between 10 to 100 m mole kg-1 of dry matter.

Question : Assertion :- Bondorderfor bothNO ^+andNO ^-is 2.5. Reason:-NO ^+is lessstablethanNO ^-

Question :Assertion :- Bond energy of F_2 is less than Cl_2. Reason :- Bond length of F_2 is smaller than Cl_2.

Question : Assertion: BOD indicates the extent of water pollution by organic wastes.Reason: Increase in BOD decreases dissolved oxygen of wastewater.

Question :Assertion : BOD indicates the extent of water pollution by organic wastes. Reason: Increase in BOD decrease dissolved oxygen of waste water.

Question : Assertion :- Biopiracy refers to the use of bioresources by multinational companies without proper authorization from the countries. Reason :- The Indian govemment has set up GEAC to prevent biopiracy.

Question :Assertion :- Bird flying high up in air does not cast shadow on the earth ground. Reason :- The size of bird is smaller than sun and sun is an extended source of light.

Question : Assertion: Biotic community hashigher position than population in ecological hierarchy. Reason: Population of similar individuals remains isolated in the community.