24277 + Interview Questions in Biology in Class 12 Page 427 InterviewSolution

21301.	Question : Assertion. Feeding of rarer plants into agriculture and horiticulture trade is of great advantage to genetic conservation. Reason. Rare plants and animals have enhanced in their only because of their trade.
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 but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

21302.	Question : Assertion: Failure of testes to descend into the scrotum causes sterility in man. Reason: Higher temperature in the abdomen than in the scrotum is not suitable for sperm development.
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

21303.	Question :Assertion: Extranuclear chromosomes are present in mitochondria and plastids.Reason: They are prochromosomes or organelle chromosomes
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

21304.	Question : Assertion : External parasitism is generally marked by much more exterme specialisation than internal parasitism. Reason : The structure of an internal parasite is usually very complex possessing suckers, reproductive organs, etc.
Answer» Solution :Internal PARASITISM is generally marked by much more extreme specialisation than external parasitism, as shown by many protists and INVERTEBRATE parasites that infect humans. The more closely the life of the parasite is linked with that of its host, the more its MORPHOLOGY and behaviour are likely to have been modified during the course of its evolution. Conditions within the body of an organism are different from those ENCOUNTERED outside and are apt to be much more constant. CONSEQUENTLY, the structure of an internal parasite is often simplified and unnecessary structure are lost as it evolves.

Discussion

21305.	Question : Assertion :- Excitement of electron from PS to first e-acceptor is uphill process. Reason :- Redox potential of first e-acceptor is less than the ground state of reaction centre
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

21306.	Question : Assertion :- Evolution is not a directed process in the sense of determism. Reason :- Evolution is a stochastic process based on chance events in nature and chance mutation in the organisms.
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

21307.	Question : Assertion:Evolutionary trend is continous changes of character in a linage. Reason: Lineage is an evolutionary sequence arranged in linear order.
Answer» Solution :The continous change of the CHARACTERS within an evoving lineage is called evolutinarytrend. A lineage is an EVOLUTIONARY SEQUENCE. Arranged in linear orther from an ancestral group to descendant group. A trent may be progressing (a general increase in size of organs) or retrogressive (a general DEGENERATION and loss of organs.)

Discussion

21308.	Question : Assertion: Evolution is not a directed process in sense of determinism. Reason: Evolution is a stochastic process based on chance events in nature and chance mutation in the organisms.
Answer» Solution :Evolution by anthropogenic action, such as EXCESSIVE USE of pesticides and antibiotics may lead to appearance of resistant organisms in a span of months and YEARS, and not centuries. This SHOWS that evolution is not a directed process, it is RATHER based on chance event and mutations occurring in nature and organisms respectively

Discussion

21309.	Question :Assertion :- Every collision among reactant molecules is not responsible for the formation of products. Reason :- Only an activated molecule with proper orientation can give rise to the formation of product.
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

21310.	Question : Assertion: Each seminiferous tubule is lined on its inside by three types of cells. Reason: These cells are male germ cells, Sertoli cells and Leydig'scells.
Answer» SOLUTION :REFER to ANSWER 2.

Discussion

21311.	Question : Assertion: Evolution is adaptation through generations. Reason: Only useful and continuous variations are inheritable.
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

21312.	Question : Assertion: Euro II norms are framed to reduce the content of CO and aromatic compounds from fuels. Reason: These compounds lead to reduced visibility and carboxyhemoglobin formation.
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 :D

Discussion

21313.	Question : Assertion : During pregnancy, development of foetus occurs in stages. Reason: In second month of pregnancy, limbs, most of the organs and external genitalia are formed.
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 :C

Discussion

21314.	Question : Assertion: During pregnancy the levels of hormones like estrogens and progetrogens are increased. Reason: The increased production of these hormones is essential for fetal growth.
Answer» SOLUTION :N//A

Discussion

21315.	Question : Assertion :- Due to continental drift pouched mammals of Australia survived. Reason :- There is lack of competition from any other mammal.
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

21316.	Question : Assertion : Evencs refers to a scientific method of treating e-wastes in an environment friendly manner. Reason : Recycling of e-wastes in developed countries often involves manual participation and exposes the workers to toxic substances present in e-wastes.
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 :Irreparable computers and other electronic goods are known as electronic wastes (e-wastes). E-wastes are BURIED in landfills or incinerated. Over half of the e-wastes GENERATED in the developed world are exported to developing countries, mainly to China, India and Pakistan, where metals like copper, iron, silicon, nickel and gold are recovered during recycling process. Developed countries enforced strict environmental laws in 1980s. This pushed up the cost of handling and treatment of hazardous wastes. They started exporting the wastes to developing countries. Unlike developed countries, which have specifically built facilities for recycling of e-wastes, recycling in developing countries often involves manual participation thus exposing workers to toxic substances PRESENT in e-wastes. A scientific method of treating e-wastes in an environment friendly manner has been developed. It is called evencs.

Discussion

21317.	Question : Assertion: Drosophila melanogaster is widely used in genetic research.Reason: Drosophila melanogaster is a readily available insect.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.
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

21318.	Question : Assertion : Eukaryotic mRNA requires post transcription processing for formation of functional mRNA. Reason : Eukaryotic transcripts possess extra non-functional segments called introns.
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 :(a) Ineukaryotes ,the monocistronic structural GENES have INTERRUPTED coding sequences i.e. , the genes in eukaryotes are split. The coding sequences or experssed sequences are defined as exons . They are SAID to be those sequence that appear in matureor intervening sequences which do not appear in mature or processed RNA. Thus ,post-transcription processing, which involves splicing of introns and fusion of exons, is required to form funcitonal mRNA.

Discussion

21319.	Question : Assertion: Escherichia coli, Shigella sp and Salmonella sp are all responsible for diarrhoeal diseases. Reason: Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.
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

21320.	Question : Assertion: Dope test is used to estimate the level of blood alcohol by analysing the breath of persons drinking alcohol. Reason: A drunken person usually feels tense and less talkative.
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

21321.	Question :Assertion: Epstein-Barr virus is an oncovirus. Reason: It stimulates the growth of cancer.
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

21322.	Question : Assertion :-Dog fish and Whale are example of Homology. Reason : Ancestors of Dog fish and Whale were terrestrial.
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 :D

Discussion

21323.	Question : Assertion : Energy value of biogas is lower than that of organic matter. Reason : Biogas minimises the chances of spread of fecal pathogens.
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

21324.	Question : Assertion: DNA segments can be excised by 'molecular scissors' or 'chemical scalpels' that biotechnologists call restriction enzymes Reason: Restriction enzymes are synthesised by microbes as a defence mechanism and are specific endonucleases which can cleave double-stranded DNA.
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

21325.	Question : Assertion :- Entire ammonia arise from ammonification get converted into nitrates. Reason:- Plant absorb nitrogen exclusively in the form of nitrates.
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

21326.	Question : Assertion. DNA molecule acts as a template for synthesis of both RNA and DNA. Reason. DNA duplex has the feature of right handed coiling and antiparallel.
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

21327.	Question : Assertion : ELISA test is based on antigen-antibody interactions where a pathogen can be detected by the presence of antibodies (proteins,glycoproteins, etc) on it Reason : The pathogen antibody to be identified is immobilised on the surface of specially constructed ELISA plates and is then tested.
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 :ELISA (enzyme LINKED immuno-sorbant) is a technique BASED on the principle of antigen-antibody interactions. Pathogens have specific antigens on their surface like protein, glycoproteins, etc. THUS,their infection can be detected by using the ANTIBODIES specific to bind with those antigenes. In process antigens are immobilised to ELISA plates. Then antibody specific to the antigen is ADDED and allowed to react with the adsorbed antigen. A complex procedure is followed.

Discussion

21328.	Question : Assertion: ELISA is widely used for the detection of infectious diseases like AIDS.Reason: ELISA is very sensitive and selective test and needs very small amount of reagents.
Answer» ANSWER :B

Discussion

21329.	Question : Assertion : DNA isconsidered to be better gentic material than RNA for most organisms. Reason : 2' -OH group present in DNA makes it labile and less reactive.
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 :2'-OH group PRESENT at every nucleotide in RNA is a reactive group and makes RNA labile and easily degradable .

Discussion

21330.	Question : Assertion: Earth's atmosphere is about up to a height of 3000 km. Reason: First 75 km of earth's atmosphere is called troposphere in which lightning, thunder, cloud formation occur.
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 ISNOT 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

21331.	Question : Assertion: Disruptive selection changes the population towareds one particular direction. Reason: This type of selection favours average sized individuals.
Answer» Solution :Distruptive type of selection FAVOURS both small-sized and large-sized individuals. It eliminates most of members with meanexpression, so PRODUCES TWO peaks in the DISTRIBUTION of the trait that MAY lead to development of two different population.

Discussion

21332.	Question : Assertion: Discovery of penicillin by Alexander Flemming was a serendipity.Reason: Flemming was working on Penicillium notatum along with Staphylococcus 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 :C

Discussion

21333.	Question : Assertion : Elimination of a competitively inferior species in a closely related or otherwise similar group is known as competitive exclusion principle. Reason : If two species compete for the same resource, they could aviod competition by choosing different times for feeding or different foraging patterns.
Answer» Solution :Gause's' COMPETITIVE Exclusion Principle' states that two CLOSELY related species competing for the same resources cannot co-exist indefinitely and the competitively inferior one is eliminated eventually. This may be true if resources are LIMITING, but not otherwise. Mechanism of 'Resource partitioning'states that if two species compete for the same resource, they could avoid competition by choosing, for INSTANCE, different times for feeding or different foraging patterens.

Discussion

21334.	Question : Assertion : Discovery of penicillin by Alexander Fleming was a serendipity Reason: A Fleming was working on Penicillium notatum along with Staphylococcus bacteria,
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 :C

Discussion

21335.	Question : Assertion: Dinosaurs were connecting links between reptiles and birds. Reason: They had characters of two different groups.
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

21336.	Question : Assertion : Diet rich in unsaturated fat and obesity are the causes for heart disease.Reason : The proteins blocks the blood vessels.
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 false

Discussion

21337.	Question : Assertion :- Different aged rock sediments contain fossils of different life forms. Reason :- Certain life forms are restricted to certain geological time-spans.
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

21338.	Question : Assertion :- Diaphragm, cervical cap and vaults are barrier made up of rubber. Reason :- They does not provide protection against STDs.
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

21339.	Question :Assertion :-Development of cork cambium is the consequence of activity of vascular cambium ring. Reason :-Cells arise from vascular cambium create pressure on outer cortex and epidermis layer and start to break so need to counter this pressure.
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

21340.	Question : Assertion : Deforestation increases carbon dioxide concentration in the atmosphere. Reason : Deforestation may lead to desertification.
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 :Deforestation is the conversion of forested areas to non-forested ONES. One of the MAJOR effects of deforestation is enhanced carbon dioxide concentration in the atmosphere because trees that could hold a lot of carbon in their biomass are lost with deforestion. Deforestation also causes loss of biodiversity due to habitat destruction, disturbs HYDROLOGICAL cycle, causes soil erosion and MAY lead to desertification.

Discussion

21341.	Question : Assertion :- Deficiency symptoms of NPK first appear on old plant parts. Reason:- NPK are mobile elements so they transport from old parts to young parts.
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

21342.	Question : Assertion: Deficiency of vitamin D causes bone weakness Reason : Cholecalciferol is synthesised in skin by the action of sunlight
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

21343.	Question : Assertion :- Deficiency of any element can cause multiple symptoms. Reason:- The same symptoms may be caused by the deficiency of one of the several different elements.
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

21344.	Question : Assertion: Darwin's finches of Galapagos islands have different types of modified beaks according to their food habits. Reason: Adaptive radiation, leads to development of different functional structure from a common ancestral form.
Answer» SOLUTION :N//A

Discussion

21345.	Question : Assertion : Dark reaction of photosynthesis uses ATP and NADPH_(2) Reason : Dark reaction takes place in absence of light.
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 :C

Discussion

21346.	Question : Assertion : Cultural eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents, etc. Reason : The prime contaminants from sewage and industrial effluents are nitrates and phosphates, which act as plant nutrients and overstimulate the growth of algae.
Answer» SOLUTION :N//A

Discussion

21347.	Question : Assertion: Cu-T and Cu-7 do not suppress sperm motility. Reason: Hormones released by them affect sperm motility.
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

21348.	Question : Assertion: Cryopreservation is one of the best methods of germplasm storage. Reason: In cryopreservation, the cells remain in asuspendedstage
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

21349.	Question : Assertion: Cryophytes can carry out pholosynthesis even at- 35^@C Reason: Some thermal algae can carry on photosynthesis even at 95^@C
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

21350.	Question : Assertion cremocarp fruits possess persistent sytlopodium or stylopod reason Fruits of ricinuis ocimum are the explames of cremocarp
Answer» Both Assertion and Reason are ture and Reason is CORRECT EXPLANATION of Assertion Both Assertion and Reason are true but Reason is ot a correct explanttion of Assertion Assertion is ture but Reason is flase Reason is ture but Assertion is false Solution :CREMOCARP fruits do posses perisitent stylopoidum but they are FOUND in flamily umbelliferea

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion. Feeding of rarer plants into agriculture and horiticulture trade is of great advantage to genetic conservation. Reason. Rare plants and animals have enhanced in their only because of their trade.

Question : Assertion: Failure of testes to descend into the scrotum causes sterility in man. Reason: Higher temperature in the abdomen than in the scrotum is not suitable for sperm development.

Question :Assertion: Extranuclear chromosomes are present in mitochondria and plastids.Reason: They are prochromosomes or organelle chromosomes

Question : Assertion : External parasitism is generally marked by much more exterme specialisation than internal parasitism. Reason : The structure of an internal parasite is usually very complex possessing suckers, reproductive organs, etc.

Question : Assertion :- Excitement of electron from PS to first e-acceptor is uphill process. Reason :- Redox potential of first e-acceptor is less than the ground state of reaction centre

Question : Assertion :- Evolution is not a directed process in the sense of determism. Reason :- Evolution is a stochastic process based on chance events in nature and chance mutation in the organisms.

Question : Assertion:Evolutionary trend is continous changes of character in a linage. Reason: Lineage is an evolutionary sequence arranged in linear order.

Question : Assertion: Evolution is not a directed process in sense of determinism. Reason: Evolution is a stochastic process based on chance events in nature and chance mutation in the organisms.

Question :Assertion :- Every collision among reactant molecules is not responsible for the formation of products. Reason :- Only an activated molecule with proper orientation can give rise to the formation of product.

Question : Assertion: Each seminiferous tubule is lined on its inside by three types of cells. Reason: These cells are male germ cells, Sertoli cells and Leydig'scells.

Question : Assertion: Evolution is adaptation through generations. Reason: Only useful and continuous variations are inheritable.

Question : Assertion: Euro II norms are framed to reduce the content of CO and aromatic compounds from fuels. Reason: These compounds lead to reduced visibility and carboxyhemoglobin formation.

Question : Assertion : During pregnancy, development of foetus occurs in stages. Reason: In second month of pregnancy, limbs, most of the organs and external genitalia are formed.

Question : Assertion: During pregnancy the levels of hormones like estrogens and progetrogens are increased. Reason: The increased production of these hormones is essential for fetal growth.

Question : Assertion :- Due to continental drift pouched mammals of Australia survived. Reason :- There is lack of competition from any other mammal.

Question : Assertion : Evencs refers to a scientific method of treating e-wastes in an environment friendly manner. Reason : Recycling of e-wastes in developed countries often involves manual participation and exposes the workers to toxic substances present in e-wastes.

Question : Assertion : Eukaryotic mRNA requires post transcription processing for formation of functional mRNA. Reason : Eukaryotic transcripts possess extra non-functional segments called introns.

Question : Assertion: Escherichia coli, Shigella sp and Salmonella sp are all responsible for diarrhoeal diseases. Reason: Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.

Question : Assertion: Dope test is used to estimate the level of blood alcohol by analysing the breath of persons drinking alcohol. Reason: A drunken person usually feels tense and less talkative.

Question :Assertion: Epstein-Barr virus is an oncovirus. Reason: It stimulates the growth of cancer.

Question : Assertion :-Dog fish and Whale are example of Homology. Reason : Ancestors of Dog fish and Whale were terrestrial.

Question : Assertion : Energy value of biogas is lower than that of organic matter. Reason : Biogas minimises the chances of spread of fecal pathogens.

Question : Assertion: DNA segments can be excised by 'molecular scissors' or 'chemical scalpels' that biotechnologists call restriction enzymes Reason: Restriction enzymes are synthesised by microbes as a defence mechanism and are specific endonucleases which can cleave double-stranded DNA.

Question : Assertion :- Entire ammonia arise from ammonification get converted into nitrates. Reason:- Plant absorb nitrogen exclusively in the form of nitrates.

Question : Assertion. DNA molecule acts as a template for synthesis of both RNA and DNA. Reason. DNA duplex has the feature of right handed coiling and antiparallel.

Question : Assertion: ELISA is widely used for the detection of infectious diseases like AIDS.Reason: ELISA is very sensitive and selective test and needs very small amount of reagents.

Question : Assertion : DNA isconsidered to be better gentic material than RNA for most organisms. Reason : 2' -OH group present in DNA makes it labile and less reactive.

Question : Assertion: Earth's atmosphere is about up to a height of 3000 km. Reason: First 75 km of earth's atmosphere is called troposphere in which lightning, thunder, cloud formation occur.

Question : Assertion: Disruptive selection changes the population towareds one particular direction. Reason: This type of selection favours average sized individuals.

Question : Assertion: Discovery of penicillin by Alexander Flemming was a serendipity.Reason: Flemming was working on Penicillium notatum along with Staphylococcus bacteria.

Question : Assertion : Discovery of penicillin by Alexander Fleming was a serendipity Reason: A Fleming was working on Penicillium notatum along with Staphylococcus bacteria,

Question : Assertion: Dinosaurs were connecting links between reptiles and birds. Reason: They had characters of two different groups.

Question : Assertion : Diet rich in unsaturated fat and obesity are the causes for heart disease.Reason : The proteins blocks the blood vessels.

Question : Assertion :- Different aged rock sediments contain fossils of different life forms. Reason :- Certain life forms are restricted to certain geological time-spans.

Question : Assertion :- Diaphragm, cervical cap and vaults are barrier made up of rubber. Reason :- They does not provide protection against STDs.

Question :Assertion :-Development of cork cambium is the consequence of activity of vascular cambium ring. Reason :-Cells arise from vascular cambium create pressure on outer cortex and epidermis layer and start to break so need to counter this pressure.

Question : Assertion : Deforestation increases carbon dioxide concentration in the atmosphere. Reason : Deforestation may lead to desertification.

Question : Assertion :- Deficiency symptoms of NPK first appear on old plant parts. Reason:- NPK are mobile elements so they transport from old parts to young parts.

Question : Assertion: Deficiency of vitamin D causes bone weakness Reason : Cholecalciferol is synthesised in skin by the action of sunlight

Question : Assertion :- Deficiency of any element can cause multiple symptoms. Reason:- The same symptoms may be caused by the deficiency of one of the several different elements.

Question : Assertion: Darwin's finches of Galapagos islands have different types of modified beaks according to their food habits. Reason: Adaptive radiation, leads to development of different functional structure from a common ancestral form.

Question : Assertion : Dark reaction of photosynthesis uses ATP and NADPH_(2) Reason : Dark reaction takes place in absence of light.

Question : Assertion: Cu-T and Cu-7 do not suppress sperm motility. Reason: Hormones released by them affect sperm motility.

Question : Assertion: Cryopreservation is one of the best methods of germplasm storage. Reason: In cryopreservation, the cells remain in asuspendedstage

Question : Assertion: Cryophytes can carry out pholosynthesis even at- 35^@C Reason: Some thermal algae can carry on photosynthesis even at 95^@C

Question : Assertion cremocarp fruits possess persistent sytlopodium or stylopod reason Fruits of ricinuis ocimum are the explames of cremocarp