24277 + Interview Questions in Biology in Class 12 Page 426 InterviewSolution

21251.	Question : Assertion : Hybrid is formed by cross betwveen two organisms that are different in one, or more thar Reason : Mendel crossed two plants differing in one trait to obtain F_(1) plants which is monohybrid cross
Answer» Both A and R are true and R is the correct explanation of A. Both A and R are true but Ris not correct explanation of A A is true but R is false A and R are false Answer :B

Discussion

21252.	Question : Assertion: Humulin is more effective than the insulin produced by conventional methods.Reason: Humulin is absorbed rapidly in the blood than the conventionally produced insulin.
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

21253.	Question : Assertion: human population not doubles every 35 years as against 200 years in 1600-1800. Reason. Rapid increase is due to better health facilities and food resources.
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

21254.	Question : Assertion : Human insulin can be produced into bacterial cells using biotechnology Reason : To produce human insulin the A, B and C polypeptides of the human insulin are produced separately in the bacterial cells, extracted and combined by creating disulphide bonds
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 bacteria have been produced that translate the constituting polypeptide CHAINS of human insulin. These POLYPEPTIDES can be extracted from the bacterial cells and COMBINED by creating disulphide bonds to produce human insulin. In humans, insulin is produced as a prohormone with three polypeptides A, B and C. After processing, the C peptide is removed and mature insulin is formed. When transgenic bacteria are used, instead of producing extra stretch of C peptide, only A and B polypeptides are produced and then linked to produce mature insulin directly.

Discussion

21255.	Question : Assertion: Human male ejaculates about 5-100 million sperms during a coitus. Reason: For normal fertillity at least 40 percent sperms must have normal shape and size.
Answer» SOLUTION :Human male ejaculates about 200 to 300 MILLION sperms during a coitus of which, for normal fertility, at least 60 percent sperms must have normal SHAPE and size and atleast 40 percent of them must show vigorous MOTILITY.

Discussion

21256.	Question : Assertion: Human evolution occurred in Asia and Africa. Reason: The earliest fossils of the prehistoric man have been found from the late Miocene of Shivalik hills in India.
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

21257.	Question : Assertion: Human ancestors never used their tails and so the tail-expressing gene has disappeared in them. Reason: Lamarck's theory of evolution is popularly called theory of continuity of germplasm.
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

21258.	Question :Assertion: Human beings are not suitable for breeding experiments to investigate the human traits.Reason: Their lifespan is small.
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

21259.	Question : Assertion: Honey is an animal product produced by honeybee Reason: Honey contains only sugar, nothing else.
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 :D

Discussion

21260.	Question : Assertion: HIV infection can be avoided by use of condoms. Reason: Condoms secrete anti-viral interferons.
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

21261.	Question : Assertion :- High dosage of progesterone is present in i-pill which is used as emergency contraceptive pill. Reason :- Progesterone cause cervical mucous thickning and stops entry of sperms in uterine cavity.
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

21262.	Question : Assertion Hexokinase require divalent cation Mg^(2+) Reason Mg^(2+) or Mn^(2+) combines with ATP to form MgATP^(2+)
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. Both Assertion and Reason are false. Solution :Hexokinase require divalent cation `(MG^(2+)` or `Mn^(2+))` which combines with ATP and FORM SUBSTRATE Mg `ATP^(2+)` or Mn `ATP^(2+)`.

Discussion

21263.	Question : Assertion: HIV causes cellular immunodeficiency. Reason: HIV kills both B-lymphocytes and helper T-lymphocytes.
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

21264.	Question : Assertion : Heterospory and retention of female gametophyte are responsible for origin of seed habit in Selaginella Reason : Psilotum is a living fossil
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

21265.	Question : Assertion : Heavy metals and persistent pesticides pass into the food chain and increase in amount per unit weight of the organism at successive trophic levels. Reason : Heavy metals and persistent pesticides can be easily metabolised by the organism's body.
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 :Heavy metals and persisten pesticides (e.g., organochlorine or chlorinated hydrocarbons like DDT) pass into food CHAIN and increase in amount per unit WEIGHT of organisms with the rise in TROPHIC level due to their ACCUMULATION in fat. The phenomenon is called biomagnification/bioconcentration/biological amplification. In other words, biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an ORGANISM cannot be metabloised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT. High concentration of DDT disturb calcium metabloism in birds, which causes thinning of egge shell and their premature breaking, eventually causing decline in bird population. These chlorinated hydrocarbons affect CNS, cause softening of brain, cerebral haemorrhage, liver cirrhosis, hypertensin and also affect an organism's reproductive system.

Discussion

21266.	Question :Assertion :- Heroin is a CNS deprassant. Reason :- Heroin causes depression.
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

21267.	Question : Assertion: Heroin addicts have more chances of occurrence of AIDS, hepatitis, etc. Reason: Heroin is the most dangerous and addictive opiate.
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

21268.	Question :Assertion :- Half-life of a 1st order reaction does not depend on the initial concentration of the reactant. Reason :- Because for 1""^(st) order reactiont _ (1//2) = ( 2.303 log _(10)^ 2 ) /(K )
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

21269.	Question : Assertion : Health is affected by geneticdisorders. Infections and lifestyle Reason : Mindandmentalstate can affect our health.
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 :Of course health AFFECTED by : (i) Genetic disorders : Deficiencies with whicha child is borm and deficiencies`//`defects which the child INHERITS from parents from birth : (ii) Infections and (iii) LIFE style including food and water we take rest and exercise we give to our bodies habits thqatwe have or lack ETC.

Discussion

21270.	Question : Assertion: Hardy-Weinberg principle explains the variations occurring in population and species over a number of generations. Reason: Hardy-Weinberg principle is applicable only when genetic drift occurs.
Answer» Solution :The relative frequencies of various kinds of genes in a large and randomly mating. Sexual panmictic population tend to remain constant from generation to generation in the absence of mutation, selection and GENE FLOW. This is called Hardy-Weinberg principle or Hardy-Weinberg equilibrium. It is RANDOM in gene (allele) frequency and occurs only by chance it is non-directional. Genetic drift can cause ELIMINATION of certain ALLELES or fixation of the other in the population leading to a change in the populatin of alleles in the gene pool so, genetic drift must not occur to maintain the equilibrium.

Discussion

21271.	Question : Assertion: Harvested fish should be immediately carried to the market for disposal. Reason: Fish decay very quickly.
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

21272.	Question :Assertion: Haemophilia shows criss-cross inheritance.Reason: The gene that causes haemophilia is recessive and lies in the sex (X) chromosome.
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

21273.	Question : Assertion. Guanine cannot pair with cytosine. Reason. Guanine and cytosine do not have perfect matching.
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 :D

Discussion

21274.	Question : Assertion : Green revolution was comparatively less effective in developing world where farmers were dependent on conventional breeding Reason : In developing world, inability to buy expensive agro-chemicals forced farmers to rely on conventional breeding.
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 :Given revolution was the phase of enormous increase in the agricultural production when high yielding improved varieties of crop plants were used. But the increased yield was partly due to use of improved crop varieties but MAINLY due to use of better MANAGEMENT practies and agrochemicals (chemical and fertilisers). These practics and agrochemicals were generally very expensive in developing world which the farmers could not affort. Hence, the farmers of developing world could not affors. Hence, the fgarmer of developing world relied mainly on cheaper methods of CONVENTIONAL breeding THUS green revolution could METHOD of conventional breeding thus green revolution could not become as productive or effective as it was in developed world.

Discussion

21275.	Question : Assertion: Grafting is attempted in those plants which show secondary growth. Reason: Cambium during secondary growth show cell division in both stock and scion
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

21276.	Question : Assertion: Grafting is not usually possible in monocots Reason: Successful grafting requires that cambia of both stock and scion fuse to form new vascular tissues
Answer» If both the assertion and the REASON are true and the reason is a correct EXPLANATION of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is FALSE If both the assertion and reason is false Answer :A

Discussion

21277.	Question : Assertion : Gonorrhoea is a dreaded disease. Reason : Cannot be completely cured even if diagnosed at early stage.
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 :D

Discussion

21278.	Question : Assertion : GM salmon was the first transgenic animal for performing vaccine safety tests Reason : For the production of GM salmon, genetically modified ova were fused with normal sperms of the same species.
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 :Genetically modified (GM) organisms are those organisms that have their genetic material modified to meet some desired conditions. They generally carry a foreign gene in their DNA. GM salmon was the first transgenic animal for food production. It was procuced by FUSION of normal ova (EGGS) with genetically modified SPERMS. The zyotes with modified gene developed into embryos which gace rise to much bigger adults than either parent, thus have greater food value. It is achieved by addition of a gene that codes for the growth hormone that allows the fish to grow larger more rapidly than the non-transgenic shown.

Discussion

21279.	Question : Assertion (A): Genetic variation provides the raw material for selection. Reason (R): Genetic variations are differences in genotypes of the individuals.
Answer» ASSERTION is RIGHT an REASON is WRONG Assertion is wrong and reason is right Both reason and assertion is right Both reason and assertion is wrong Answer :C

Discussion

21280.	Question : Assertion: Genetic engineering is essentially the alteration of the genetic make up of cells by deliberate and artificial means. Reason: It involves transfer or replacement of genes to create recombinant 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

21281.	Question : Assertion: Genetic engineering is also called recombinant DNA technology. Reason: It brings about improvement of genetic make up of an organism.
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

21282.	Question : Assertion. Genetic code shows code in mRNA not in DNA. Reason. DNA is present inside the nucleus and code is read from mRNA inside the cell.
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

21283.	Question : Assertion: Genetic drift refers to changes in the allele frequency occuring by chance. Reason: Sampling errors often lead to the elimination of certain alleles and fixation of others, reducing genetic variability.
Answer» SOLUTION :N//A

Discussion

21284.	Question : Assertion: Genetic diversity of our crop plants must be conserved. Reason: Genetic diversity is being or is likely to be used in the improvement of domesticated plants.
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

21285.	Question : Assertion: Gametophyte of homosporous pteridophyte does on sporophytic body. Reason: In homosporous pteridophytes there is ex situ or exosporic spore germination.
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

21286.	Question : Assertion: From evolutionary point of view, human gestation period is believed to the shortening Reason: One major evolutionary trend in humans has been larger head undergoing faster growth rate in the foetal stage.
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

21287.	Question : Assertion: Frog has a fish-like tadpole larva in its life history Reason: Ontogeny repeats phylogeny.
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

21288.	Question : Assertion: Frequent vaginal touches should be avoided. Reason: Lactobacilli normally present in the vagina change glycogen of the broken off cells into lactic acid that kills foreign bacteria.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the correct EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :A

Discussion

21289.	Question : Assertion: Founder effect may lead to formation of new species. Reason: Founders carry all the parental gene pool to a new location.
Answer» Solution :When a few INDIVIDUALS or a small group of individuals from some large population invades a new or ISOLATED geographical region, these become the founders or founder members. These founders carry on a limited portion of the parental genen pool. Their gene pool may contain certain alleles in a very low frequency or may lack a few alleles. the descendants of the founder i.e,. the founder population or marginal isolates in a new area will TEND to have RATIOS similar to the founders rather than the source population. SOMETIMES they form a new species.

Discussion

21290.	Question : Assertion :- Fossils are always reamins of hard parts of life -forms found only in rocks. Reason :- Rocks are formed due to sediments.
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

21291.	Question : Assertion: Forelimbs of different vertebrates are basically similar. Reason: These are functionally similar but have different origin.
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

21292.	Question :Assertion: For law of independent assortment, two pairs of contrasting characters are used simultaneously in a cross.Reason: It is a dihybrid cross.
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

21293.	Question : Assertion. For DNA replication RNA primer is needed. Reason. Synthesis of new DNA chain is initiated by DNA polymerase.
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

21294.	Question : Assertion :- For a physical pendulum if distance of point of suspension from centre of mass increases time period first decreases then increases. Reason :- For a physical pendulum there is some distance from centre of mass at which frequency of oscillation is maximum.
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

21295.	Question : Assertion:-Flower is a modified shoot. Reason :-In flower vegetative shoot apica meristem changes to reproductive shoot apex/floral meristem in which internodes do not elongate anc the axis gets condensed.
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

21296.	Question : Assertion :-Flower is a modified shoot. Reason :-In flower vegtation shoot apical meristem changes to reproductive shoot apex/floral meristem in which internodes do not elongate and the axis gets condensed.
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

21297.	Question : Assertion: Flattening of plants against ground due to wind action is called lodging. Reason: The plants are uprooled by high wind velocity.
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

21298.	Question : Assertion: Fish meal is a rich source of proteins for cattle and poultry. Reason: Fish meal is produced from non-edible parts of fish like fins, gills, etc.
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

21299.	Question : Assertion. Few of repetitive sequences are called as jumping genes. Reason. They jump at place of location and do not change their position.
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

21300.	Question : Assertion : Fermentation occurs by incomplete oxidation of glucose. Reason : Yeast form ethanol & CO_(2) from pyruvic acid.
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

Explore topic-wise InterviewSolutions in .

Question : Assertion : Hybrid is formed by cross betwveen two organisms that are different in one, or more thar Reason : Mendel crossed two plants differing in one trait to obtain F_(1) plants which is monohybrid cross

Question : Assertion: Humulin is more effective than the insulin produced by conventional methods.Reason: Humulin is absorbed rapidly in the blood than the conventionally produced insulin.

Question : Assertion: human population not doubles every 35 years as against 200 years in 1600-1800. Reason. Rapid increase is due to better health facilities and food resources.

Question : Assertion : Human insulin can be produced into bacterial cells using biotechnology Reason : To produce human insulin the A, B and C polypeptides of the human insulin are produced separately in the bacterial cells, extracted and combined by creating disulphide bonds

Question : Assertion: Human male ejaculates about 5-100 million sperms during a coitus. Reason: For normal fertillity at least 40 percent sperms must have normal shape and size.

Question : Assertion: Human evolution occurred in Asia and Africa. Reason: The earliest fossils of the prehistoric man have been found from the late Miocene of Shivalik hills in India.

Question : Assertion: Human ancestors never used their tails and so the tail-expressing gene has disappeared in them. Reason: Lamarck's theory of evolution is popularly called theory of continuity of germplasm.

Question :Assertion: Human beings are not suitable for breeding experiments to investigate the human traits.Reason: Their lifespan is small.

Question : Assertion: Honey is an animal product produced by honeybee Reason: Honey contains only sugar, nothing else.

Question : Assertion: HIV infection can be avoided by use of condoms. Reason: Condoms secrete anti-viral interferons.

Question : Assertion :- High dosage of progesterone is present in i-pill which is used as emergency contraceptive pill. Reason :- Progesterone cause cervical mucous thickning and stops entry of sperms in uterine cavity.

Question : Assertion Hexokinase require divalent cation Mg^(2+) Reason Mg^(2+) or Mn^(2+) combines with ATP to form MgATP^(2+)

Question : Assertion: HIV causes cellular immunodeficiency. Reason: HIV kills both B-lymphocytes and helper T-lymphocytes.

Question : Assertion : Heterospory and retention of female gametophyte are responsible for origin of seed habit in Selaginella Reason : Psilotum is a living fossil

Question : Assertion : Heavy metals and persistent pesticides pass into the food chain and increase in amount per unit weight of the organism at successive trophic levels. Reason : Heavy metals and persistent pesticides can be easily metabolised by the organism's body.

Question :Assertion :- Heroin is a CNS deprassant. Reason :- Heroin causes depression.

Question : Assertion: Heroin addicts have more chances of occurrence of AIDS, hepatitis, etc. Reason: Heroin is the most dangerous and addictive opiate.

Question :Assertion :- Half-life of a 1st order reaction does not depend on the initial concentration of the reactant. Reason :- Because for 1""^(st) order reactiont _ (1//2) = ( 2.303 log _(10)^ 2 ) /(K )

Question : Assertion : Health is affected by geneticdisorders. Infections and lifestyle Reason : Mindandmentalstate can affect our health.

Question : Assertion: Hardy-Weinberg principle explains the variations occurring in population and species over a number of generations. Reason: Hardy-Weinberg principle is applicable only when genetic drift occurs.

Question : Assertion: Harvested fish should be immediately carried to the market for disposal. Reason: Fish decay very quickly.

Question :Assertion: Haemophilia shows criss-cross inheritance.Reason: The gene that causes haemophilia is recessive and lies in the sex (X) chromosome.

Question : Assertion. Guanine cannot pair with cytosine. Reason. Guanine and cytosine do not have perfect matching.

Question : Assertion : Green revolution was comparatively less effective in developing world where farmers were dependent on conventional breeding Reason : In developing world, inability to buy expensive agro-chemicals forced farmers to rely on conventional breeding.

Question : Assertion: Grafting is attempted in those plants which show secondary growth. Reason: Cambium during secondary growth show cell division in both stock and scion

Question : Assertion: Grafting is not usually possible in monocots Reason: Successful grafting requires that cambia of both stock and scion fuse to form new vascular tissues

Question : Assertion : Gonorrhoea is a dreaded disease. Reason : Cannot be completely cured even if diagnosed at early stage.

Question : Assertion : GM salmon was the first transgenic animal for performing vaccine safety tests Reason : For the production of GM salmon, genetically modified ova were fused with normal sperms of the same species.

Question : Assertion (A): Genetic variation provides the raw material for selection. Reason (R): Genetic variations are differences in genotypes of the individuals.

Question : Assertion: Genetic engineering is essentially the alteration of the genetic make up of cells by deliberate and artificial means. Reason: It involves transfer or replacement of genes to create recombinant DNA.

Question : Assertion: Genetic engineering is also called recombinant DNA technology. Reason: It brings about improvement of genetic make up of an organism.

Question : Assertion. Genetic code shows code in mRNA not in DNA. Reason. DNA is present inside the nucleus and code is read from mRNA inside the cell.

Question : Assertion: Genetic drift refers to changes in the allele frequency occuring by chance. Reason: Sampling errors often lead to the elimination of certain alleles and fixation of others, reducing genetic variability.

Question : Assertion: Genetic diversity of our crop plants must be conserved. Reason: Genetic diversity is being or is likely to be used in the improvement of domesticated plants.

Question : Assertion: Gametophyte of homosporous pteridophyte does on sporophytic body. Reason: In homosporous pteridophytes there is ex situ or exosporic spore germination.

Question : Assertion: From evolutionary point of view, human gestation period is believed to the shortening Reason: One major evolutionary trend in humans has been larger head undergoing faster growth rate in the foetal stage.

Question : Assertion: Frog has a fish-like tadpole larva in its life history Reason: Ontogeny repeats phylogeny.

Question : Assertion: Frequent vaginal touches should be avoided. Reason: Lactobacilli normally present in the vagina change glycogen of the broken off cells into lactic acid that kills foreign bacteria.

Question : Assertion: Founder effect may lead to formation of new species. Reason: Founders carry all the parental gene pool to a new location.

Question : Assertion :- Fossils are always reamins of hard parts of life -forms found only in rocks. Reason :- Rocks are formed due to sediments.

Question : Assertion: Forelimbs of different vertebrates are basically similar. Reason: These are functionally similar but have different origin.

Question :Assertion: For law of independent assortment, two pairs of contrasting characters are used simultaneously in a cross.Reason: It is a dihybrid cross.

Question : Assertion. For DNA replication RNA primer is needed. Reason. Synthesis of new DNA chain is initiated by DNA polymerase.

Question : Assertion :- For a physical pendulum if distance of point of suspension from centre of mass increases time period first decreases then increases. Reason :- For a physical pendulum there is some distance from centre of mass at which frequency of oscillation is maximum.

Question : Assertion:-Flower is a modified shoot. Reason :-In flower vegetative shoot apica meristem changes to reproductive shoot apex/floral meristem in which internodes do not elongate anc the axis gets condensed.

Question : Assertion :-Flower is a modified shoot. Reason :-In flower vegtation shoot apical meristem changes to reproductive shoot apex/floral meristem in which internodes do not elongate and the axis gets condensed.

Question : Assertion: Flattening of plants against ground due to wind action is called lodging. Reason: The plants are uprooled by high wind velocity.

Question : Assertion: Fish meal is a rich source of proteins for cattle and poultry. Reason: Fish meal is produced from non-edible parts of fish like fins, gills, etc.

Question : Assertion. Few of repetitive sequences are called as jumping genes. Reason. They jump at place of location and do not change their position.

Question : Assertion : Fermentation occurs by incomplete oxidation of glucose. Reason : Yeast form ethanol & CO_(2) from pyruvic acid.