24277 + Interview Questions in Biology in Class 12 Page 423 InterviewSolution

21101.	Question : Assertion: Old age is not anillness. It is a normal It is a continuation of life with decreasing capacity for adaptation. Reason: Cessation of mitosis is a normal genetically programmed event.
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

21102.	Question :Assertion :-OHC- underset(OH ) underset(\|)CH- underset(OH )underset(\|)CH - underset (OH ) underset(\|)CH -CH _ 2 OH hasall thechiralstereoisomers. Reason:-Principalfunctional groupof thecompoundOHC- underset(OH ) underset(\|)CH -underset(OH)underset(\|)CH-underset(OH) underset(\|)CH -CH _ 2OHis alcohol.
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

21103.	Question : Assertion: Now-a-days, there are less childless couples. Reason: A number of measures are now available by which even infertile couples can have child.
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 :A

Discussion

21104.	Question : Assertion Non-cyclic photophosphorylation occurs in the stroma of chloroplasts. Reason There is discontinuous flow of electrons in this process.
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 :Non-cyclic PHOTOPHOSPHORYLATION occurs in granum of chloroplast. It is an association of photosystem-I and II. In this process, electron continuously FLOWS from water to PS II to PS-I and thon to final electron acceptor. In this process, ATP is fomed from ADP and `O_(2)` is evolved.

Discussion

21105.	Question : Assertion : No two species within a given community can have exactly the same niche. Reason : The habitat of a species together with the functions forms its niche.
Answer» If both ASSERTION and Reason are true and Reason is CORRECT EXPLANATION of Assertion. If both Assertion and Reason are true and reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

21106.	Question : Assertion. No taste sensation occurs when drop of distilled water is put on tongue Reason. Human dows not have taste buds for water.
Answer» both are TRUE but reason is not correct explanation assertion is true but RESON is wrong. and both are wrong D Answer :A

Discussion

21107.	Question : Assertion :- Nitrogen fixation is one of the energy dependent process. Reason:- 16 ATP are required for each NH3 produced.
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

21108.	Question :Assertion: Nitrogen-fixing bacteria of legume nodules live in O_2depleted cells.Reason: Leghaemoglobin completely removes O_2from the nodule cells.
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

21109.	Question : Assertion : Nitrogen cycle is a perfect cycle. Reason : Nitrogen remains in circulation more or less uniformly.
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

21110.	Question : Assertion :- Nitrifying bacteria are chemoautotrophs. Reason:- Nitrifying bacteria obtain energy from oxidation of NH _(3) and NO _(2) ^(-)
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

21111.	Question : Assertion: Neem is used as a natural insecticide.Reason: The neem extract contains azadirachtin which acts as an antifeedant compound.
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

21112.	Question : Assertion: Neanderthal man is the intermediate between Ramapithecus and Homo erectus. Reason: Neanderthal man, with brain sizeof 800 c.c., used hides to protect their body.
Answer» Solution :The Neanderthal MAN with a brain size of 1400c.c. LIVED in NEAR East and Central Asia between 1,00,0000. 40,000 years back. They used hides to protect their BODY and buried their DEAD. It is established that Neanderthal man appeared later than Ramapithecus and Homo erectus.

Discussion

21113.	Question : Assertion: Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits. Reason: Adaptive form of a given trait tend to become more common, less adaptive ones become less common or disappear.
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

21114.	Question : Assertion: Natural selection is not the exclusive force of speciation. Reason: Natural selection is not a creative force.
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

21115.	Question : Assertion : Natural methods are based on menstrual cycle and the life of sperms Reason : Natural methods often fail to contracept.
Answer» If both Assertion and REASON are true but the reason is the correct explanation of the assertion, then MARK (1). If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true but Reason is false, then mark (3). If both Assertion and Reason are false, then mark (4). Answer :A

Discussion

21116.	Question : Assertion: Natality rate increases both population size and population density. Reason: Natality increases the number of individuals in an area by births.
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

21117.	Question : Assertion : Mycorrhizae represent a mutually beneficial interspecific interaction of fungi with roots of higher plants. Reason : In a mutualistic relationship, both the organisms enter into some sort of physiological exchange.
Answer» Solution :Mycorrhizae refer to the symboitic association of fungal hyphae with the roots of higher plants. In this association, the two symbionts are in close contact and are physiologically interdependent on each other. Mycorrhizae increase the ability of the plant to EXTRACT minerals from the SOIL. In return, fungi are provided with shelter and products of photosynthesis by the plant. Plants having such associations show other BENEFITS also, such as RESISTANCE to root-borne pathogens, tolerance to salinity and drought and an OVERALL increase in plant growth and development.

Discussion

21118.	Question : Assertion: Mutations are necessary for the survival of the species.Reason: Lack of mutation gives a temporary advantage to a species in an unchanged environment.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 :A

Discussion

21119.	Question : Assertion : Mutations are basically different from fluctuations. Reason: Mutations are sudden discontinuous and large variations, while fluctuations are small and continuous variations
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 true and Reason is a correct explanation of Assertion

Discussion

21120.	Question : Assertion: Mutations are basically different from fluctuations. Reason: Mutations are sudden discontinuous and large variations, while fluctuations are small and continuous variations.
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

21121.	Question : Assertion :- Muscle having special feature like excitability, conductivity &contractibility. Reason :- Neuron having same type of character which equally found in muscle also.
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 :3

Discussion

21122.	Question : Assertion :- Muscle having special feature like excitability, conductivity & contractibility Reason:- Neuron having same type of character which equa lly found in muscle .also
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

21123.	Question : Assertion mtDNA of Africans shows about twice as much genetic variation as mtDNA among non-Aficans. Reason mtRNA strudy supports the African hypothesis.
Answer» Both Assertion and REASON are true and Reason is the CORRECT explanation of Assertion Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion Assertion is true, but Reason is FALSE Assertion is false, but Reason is true Solution :Mitochondrial DNA study supports the out of Africa hypothesis according to which modern human (Homo sapiens) evolved from Homo erectus only in Africa. mtDNA of Africans shows about twice as much genetic variation as mtDNA of non-Africans.

Discussion

21124.	Question : Assertion: Moths living in the industrial areas became dark to match body colour to the tree trunks. Reason: Smoke from industries covers the moths, making them appear dark.
Answer» Solution :Industrial melasim is the increase of melanic (DARK)forms of an animal in the AREAS DARKENED by industrial pollution. The most common example is of peppered moth which existed in two strains (forms): light coloured (white) and melanic (black). In the past, bark of trees were covered by whitish lichens. so white moths escaped unnoticed from predatory birds. After industrialisation bark got covered by smoke, so the white moths were selectively picked up by birds. but black moths escaped unnoticed so they manged to survive RESULTING in more population of black moths and less population of white moths. Thus, industrial melanism supports evolution by natural selection.

Discussion

21125.	Question : Assertion :-Mostly plants of family Liliaceae have underground stem. Reason :-In Liliaceae family, perianth is present.
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

21126.	Question : Assertion: Mouth is a transverse slit bounded by upper and lower lips. Reason:· It leads into the buccal cavity.
Answer» Both Assertion and REASON are TRUE and Reason is correct explanation of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is FALSE. Both Assertion and Reason are false. Solution :Both Assertion and Reason are true and Reason is correct explanation of Assertion.

Discussion

21127.	Question : Assertion : Most of the enzymes of oxidative decarboxylation are present in mitochondrial matrix. Reason: ETS operates on inner membrane of mitochondria
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

21128.	Question :Assertion: Most of the orchids are dependent on fungi in seedling stage.Reason: The fungal mycelium penetrates the cortical cells of orchid roots.
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

21129.	Question : Assertion :- Most dangerous sexually transmitted disease is AIDS. Reason :- There is NO complete cure of AIDS.
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

21130.	Question : Assertion: Most of the contents of the primary oocyte are retained by the ovum and is much larger than spermatozoon. Reason: Ovum needs energy to go about in search of spermatozoa.
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. Answer :C

Discussion

21131.	Question :Assertion :- Most dangerous form of malaria is falciparum malaria. Reason :- Most common form of malaria in india is falciparum.
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

21132.	Question : Assertion :- Most biomolecules which are found in the acid insoluble fraction are macromolecules. Reason :- Most biomolecules found in acid insoluble fraction have molecular weight more than 1000 Dalton.
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

21133.	Question : Assertion : Most biomolecules which are found in the acid insoluble fraction are macromolecues Reason: Moist bimolecules found in acid insoluble fraction have molecur weight more than 1000 Dalton .
Answer» If both ASSERTION & Reason are ture & the Reason is a CORRECT explanation of the Assertion If both Assertion & Reason AR True but Reason is not a correct explantation of the Assertion If Assertion is True but the Reason is FALSE If both Assertion & Reason are false Answer :A

Discussion

21134.	Question : Assertion: Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex linked. Reason : Morgan hybridised yellow bodied, white-eyed males to brown bodied, red eyed females and intercrossed their F_(1) progeny.
Answer» If both assertion and reasons are true and the REASON is the CORRECT EXPLANATION of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex linked. Morgan hybridised yellow bodied, white-EYED females to brown bodied, red eyed males and intercrossed their `F_(1)` progeny.

Discussion

21135.	Question : Assertion : Montreal protocol, was signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances. Reason : Kyoto protocol, held in Kyoto (Japan) in 1987, has specified the commitments of different countries to mitigate climate change.
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 :N//A

Discussion

21136.	Question : Assertion : Monocytes constitute only 6-8% of WBCs but are very essential Reason: These are phagocytic cells.
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 :A

Discussion

21137.	Question : Assertion : Monosporic, 8 nucleate embryo sac is called Polygonum type. Reason : Leaves increase the size of plant
Answer» If both ASSERTION and Reason are TRUE and Reason is corret explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :C

Discussion

21138.	Question :Assertion :- Mirage appears in hot summer days.Reason :- Refractive index of air decreases with height from hot surface
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

21139.	Question : Assertion : Mitochondria & Chloroplast are connected with similar RNA sequence Reason : They show prokaryotic organisation
Answer» Without FERTILISATION DIPLOID EMBRYO forms With fertilisation diploid embryo forms Without fertilisation haploid embryo cell FORM embryo With fertilisation haploid embryo cell form embryo Answer :A

Discussion

21140.	Question : Assertion: Migration is an important factor which determines both population size and population density. Reason: In migration, a major part of population goes from one area to another area.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the correct explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE If both Assertion and Reason are false. Solution :If both Assertion and Reason are false.

Discussion

21141.	Question :Assertion: Mild fever strengthens the defence mechanism of the body. Reason: High temperature is harmful and should be brought down by giving antipyretics and by applying cold packs.
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

21142.	Question : Assertion : Migration is an important factor which determines both population size and population density. Reason : In migration, a major part of population goes from one area to another area.
Answer» If both Assertion and Reason are TRUE and Reason is a CORRECT explanation of Assertion. If both Assertion and Reason are true and Reason is not a correct explanation of Assertion. If Assertion is true but Reason is false If both Assertion and Reason are false. ANSWER :D

Discussion

21143.	Question : Assertion: Metastatic cancers are more serious than benign tumors. Reason: These spread from an organ to other body organs and there is increased interference with metabolic functions.
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

21144.	Question : Assertion: Mesophytes show well developed root system. Reason: Mesophytes depend on moderate supply of water which they draw from their root.
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 :Mesophytes cannot survive in extreme condition. Their roots are covered with for water and MINERAL adsorption hair.

Discussion

21145.	Question : Assertion: Mendel successfully formulated the laws of heredity.Reason: Mendel did not carry out the study of one character at a time.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

21146.	Question : Assertion: Mendel considered seven pairs of contrasting characters in his cross. Reason : these seven characters in his cross
Answer» Both Assertion and Reason ae TRUE and the Reason is a CORRECT explanation of the Assertion Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion Assertion is true, but the Reason is false Assertion is false, but the Reason is true SOLUTION :Now, it is WELL known that mendel's seven characters are located on four chromosomes. These are as follows

Discussion

21147.	Question : Assertion Meiotic division occurs in reproductive cells. Reason Synapsis occurs during zygotene of meiosis.
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 :Meiotic division is a reductional division. It occurs in reproductive cells and maintains the fixed number of chromosomes in sexually reproducing organisms. Prophase-I of meiotic division is a LONG phase, which is divided into five subphases, i.e, leptotene, ZYGOTENE, pachytene, DIPLOTENE and DIAKINESIS. Synapsis or pairing of chromosomes occurs during the zygotene STAGE.

Discussion

21148.	Question : Assertion :- Meiosis-1 is most significant phenomenon so that consistancy of reduction in coromosome so that consistancy of chromosome can be maintained.
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

21149.	Question : Assertion: May 31 is celebrated as No Tobacco Day. Reason: On this day, a member of Royal family of England died due to lung 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 :C

Discussion

21150.	Question : Assertion :- Maximum thickness of endometrium is present on 23^(rd) day of m.c.Reason :- Maximum level of progesterone is found on 22^(nd) day of m.c.
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

Explore topic-wise InterviewSolutions in .

Question : Assertion: Old age is not anillness. It is a normal It is a continuation of life with decreasing capacity for adaptation. Reason: Cessation of mitosis is a normal genetically programmed event.

Question : Assertion: Now-a-days, there are less childless couples. Reason: A number of measures are now available by which even infertile couples can have child.

Question : Assertion Non-cyclic photophosphorylation occurs in the stroma of chloroplasts. Reason There is discontinuous flow of electrons in this process.

Question : Assertion : No two species within a given community can have exactly the same niche. Reason : The habitat of a species together with the functions forms its niche.

Question : Assertion. No taste sensation occurs when drop of distilled water is put on tongue Reason. Human dows not have taste buds for water.

Question : Assertion :- Nitrogen fixation is one of the energy dependent process. Reason:- 16 ATP are required for each NH3 produced.

Question :Assertion: Nitrogen-fixing bacteria of legume nodules live in O_2depleted cells.Reason: Leghaemoglobin completely removes O_2from the nodule cells.

Question : Assertion : Nitrogen cycle is a perfect cycle. Reason : Nitrogen remains in circulation more or less uniformly.

Question : Assertion :- Nitrifying bacteria are chemoautotrophs. Reason:- Nitrifying bacteria obtain energy from oxidation of NH _(3) and NO _(2) ^(-)

Question : Assertion: Neem is used as a natural insecticide.Reason: The neem extract contains azadirachtin which acts as an antifeedant compound.

Question : Assertion: Neanderthal man is the intermediate between Ramapithecus and Homo erectus. Reason: Neanderthal man, with brain sizeof 800 c.c., used hides to protect their body.

Question : Assertion: Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits. Reason: Adaptive form of a given trait tend to become more common, less adaptive ones become less common or disappear.

Question : Assertion: Natural selection is not the exclusive force of speciation. Reason: Natural selection is not a creative force.

Question : Assertion : Natural methods are based on menstrual cycle and the life of sperms Reason : Natural methods often fail to contracept.

Question : Assertion: Natality rate increases both population size and population density. Reason: Natality increases the number of individuals in an area by births.

Question : Assertion : Mycorrhizae represent a mutually beneficial interspecific interaction of fungi with roots of higher plants. Reason : In a mutualistic relationship, both the organisms enter into some sort of physiological exchange.

Question : Assertion : Mutations are basically different from fluctuations. Reason: Mutations are sudden discontinuous and large variations, while fluctuations are small and continuous variations

Question : Assertion: Mutations are basically different from fluctuations. Reason: Mutations are sudden discontinuous and large variations, while fluctuations are small and continuous variations.

Question : Assertion :- Muscle having special feature like excitability, conductivity &contractibility. Reason :- Neuron having same type of character which equally found in muscle also.

Question : Assertion :- Muscle having special feature like excitability, conductivity & contractibility Reason:- Neuron having same type of character which equa lly found in muscle .also

Question : Assertion mtDNA of Africans shows about twice as much genetic variation as mtDNA among non-Aficans. Reason mtRNA strudy supports the African hypothesis.

Question : Assertion: Moths living in the industrial areas became dark to match body colour to the tree trunks. Reason: Smoke from industries covers the moths, making them appear dark.

Question : Assertion :-Mostly plants of family Liliaceae have underground stem. Reason :-In Liliaceae family, perianth is present.

Question : Assertion: Mouth is a transverse slit bounded by upper and lower lips. Reason:· It leads into the buccal cavity.

Question : Assertion : Most of the enzymes of oxidative decarboxylation are present in mitochondrial matrix. Reason: ETS operates on inner membrane of mitochondria

Question :Assertion: Most of the orchids are dependent on fungi in seedling stage.Reason: The fungal mycelium penetrates the cortical cells of orchid roots.

Question : Assertion :- Most dangerous sexually transmitted disease is AIDS. Reason :- There is NO complete cure of AIDS.

Question : Assertion: Most of the contents of the primary oocyte are retained by the ovum and is much larger than spermatozoon. Reason: Ovum needs energy to go about in search of spermatozoa.

Question :Assertion :- Most dangerous form of malaria is falciparum malaria. Reason :- Most common form of malaria in india is falciparum.

Question : Assertion :- Most biomolecules which are found in the acid insoluble fraction are macromolecules. Reason :- Most biomolecules found in acid insoluble fraction have molecular weight more than 1000 Dalton.

Question : Assertion : Most biomolecules which are found in the acid insoluble fraction are macromolecues Reason: Moist bimolecules found in acid insoluble fraction have molecur weight more than 1000 Dalton .

Question : Assertion: Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex linked. Reason : Morgan hybridised yellow bodied, white-eyed males to brown bodied, red eyed females and intercrossed their F_(1) progeny.

Question : Assertion : Montreal protocol, was signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances. Reason : Kyoto protocol, held in Kyoto (Japan) in 1987, has specified the commitments of different countries to mitigate climate change.

Question : Assertion : Monocytes constitute only 6-8% of WBCs but are very essential Reason: These are phagocytic cells.

Question : Assertion : Monosporic, 8 nucleate embryo sac is called Polygonum type. Reason : Leaves increase the size of plant

Question :Assertion :- Mirage appears in hot summer days.Reason :- Refractive index of air decreases with height from hot surface

Question : Assertion : Mitochondria & Chloroplast are connected with similar RNA sequence Reason : They show prokaryotic organisation

Question : Assertion: Migration is an important factor which determines both population size and population density. Reason: In migration, a major part of population goes from one area to another area.

Question :Assertion: Mild fever strengthens the defence mechanism of the body. Reason: High temperature is harmful and should be brought down by giving antipyretics and by applying cold packs.

Question : Assertion : Migration is an important factor which determines both population size and population density. Reason : In migration, a major part of population goes from one area to another area.

Question : Assertion: Metastatic cancers are more serious than benign tumors. Reason: These spread from an organ to other body organs and there is increased interference with metabolic functions.

Question : Assertion: Mesophytes show well developed root system. Reason: Mesophytes depend on moderate supply of water which they draw from their root.

Question : Assertion: Mendel considered seven pairs of contrasting characters in his cross. Reason : these seven characters in his cross

Question : Assertion Meiotic division occurs in reproductive cells. Reason Synapsis occurs during zygotene of meiosis.

Question : Assertion :- Meiosis-1 is most significant phenomenon so that consistancy of reduction in coromosome so that consistancy of chromosome can be maintained.

Question : Assertion: May 31 is celebrated as No Tobacco Day. Reason: On this day, a member of Royal family of England died due to lung cancer.

Question : Assertion :- Maximum thickness of endometrium is present on 23^(rd) day of m.c.Reason :- Maximum level of progesterone is found on 22^(nd) day of m.c.