24277 + Interview Questions in Biology in Class 12 Page 446 InterviewSolution

22251.	Question : Amensalism is an association between two species where
Answer» one species is harmed and other is BENEFITTED one species is harmed and other is unaffected one species is benefitted and other is unaffected both the species are harmed. Solution :•Amensalism. It is also CALLED as anti-biosis. E.g. Penicillium notatum (Blue mold) KILLS the bacteria by secreting penicillin an antibiotic. • The adversely affected species is called amensal while the affecting species is called as inhibitor. • The bacteria are harmed while the fungi (blue mold) is unaffected. • The blue mold can survive in presence or ABSENCE of bacteria. • The blue mold can survive in presence or absence of bacteria. •`+ rarr` Beneficial interaction • `- rarr` Detrimental interaction • `0 rarr` NEUTRAL interaction

Discussion

22252.	Question : Amensalism is called as …………………….
Answer» SOLUTION :ANTIBIOSIS

Discussion

22253.	Question : Amensalism is an association between two species where :
Answer» ONE SPECIES is HARMED and other is BENEFITTED. one species is harmed and other is unaffected. one species is benefitted and other is unaffected. both the species are harmed. Answer :B

Discussion

22254.	Question : Amensalism is an association between two species where:
Answer» ONE SPECIES is HARMED and other is BENEFITTED. One species is harmed and other is unaffected. One species is benefitted and other is unaffected. Both the species are harmed. Answer :B

Discussion

22255.	Question : Name the scientists who propounded the following theories. (a) Mutation theory (b) Chemical theory of evolution
Answer» SOLUTION :Mutuation THEORY was propounded by HUGO DE Vries. Chemical theory of EVOLUTION was propounded by Oparin and Haldane

Discussion

22256.	Question : Name the periods of Mesozoic era. Also mention the flora and fauna dominated during that periods.
Answer» SOLUTION :Mesozoic era is divided into three periods namely TRIASSIC, Jurassic and Cretaceous Dominating FAUNA: Reptiles and DINOSAURS Dominating FLORA: Conifers, Fens and Ginkgon.

Discussion

22257.	Question : Name the macro consumers and micro consumers.
Answer» SOLUTION :MACRO consumers are herbivores, carnivores and OMNIVORES. Micro consumers are DECOMPOSERS.

Discussion

22258.	Question : Amazonian rain forests have the greatest biodiversity on earth. List any two hypotheses that are proposed by the biologists to account for the greater biological diversity.
Answer» Solution :i. The AMAZONIAN forests, CALLED as the LUNGS of Planet Earth with constant environments promote niche specialisation and lead to a greater species diversity. ii. Amazonian forests have remained relatively undisturbed for MILLIONS of years and thus, had a long evolutionary TIME for species diversification.

Discussion

22259.	Question :''Amazon forest is considered to be the lungs of the planet'' - Justify this statement.
Answer» SOLUTION :Amazon rain forest is known as the "lungs of the planel" Nince a released due to ANTHROPOGENIC activities are untaken by their dense homologous to the FUNCTIONING of HUMAN beings EXCEPT for the difference in gases.

Discussion

22260.	Question : Amazon rain forest has the greatest biodiversityon earth. Listany two hypothese that are proposed by the biologists to accountfor thegreater biological diversity .
Answer» Solution :The hypothese are : (a) Speciationis generally regions , whichare subjected to frequent glaciations in the past , tropical LATITUDES have remainedundisturbed for millions of YEARS and hencehad a long TIME for species DIVERSIFICATION . (b) Tropical environmentsare less seasonal , relatively more constantand predictable ,such constantenvironments promote NICHE specialisation and lead to a greater species diverstiy . (c)There is moresolarenergyavailablein the tropics , whichcontributes to higherproductivity , thisin turn mightcontribute indirectly to species diversity .

Discussion

22261.	Question : Alzheimer disease in humans is associated with the deficiency of :
Answer» Gamma aminobutyric acid(GABA) DOPAMINE Glutamic acid ACETYLCHOLINE Answer :D

Discussion

22262.	Question : Alzheimer disease, charactersised by less memory is due to
Answer» LOW ACETYL CHOLINE high acetyl choline low dopamine high dopamine Answer :A

Discussion

22263.	Question : Alveoli are sites for food exchange.
Answer» ANSWER :GAS

Discussion

22264.	Question : Although the embryo depends on the mother's blood for its nutrition and supply of oxygen, its circulatory system is never directly connected with the maternal blood vessels. a. What will be the effect on the embryo if its circulatory system is directly connected with the maternal blood vessels? b. State two functions of the placenta.
Answer» Solution :a. ANTIGEN - ANTIBODY reaction will TAKE place b. i. Acts as ultra filier, ii. Elimination of NITROGEN wastes

Discussion

22265.	Question : Although the embryo depends on the mother's blood for its nutition and supply of oxygen, its circulatory system is never directly connected with maternal blood vessels. What will be the effect on the embryo if it is directly connected with maternal blood?
Answer» Solution :All HARMFUL and DISEASE CAUSING germs will pass directly into the FOETUS from MOTHER.

Discussion

22266.	Question : Although the embryo depends on the mother's blood for its nutrition and supply of oxygen, its circulatory system is never directly connected with maternal blood vessels. State two functions of the placenta.
Answer» SOLUTION :It acts as BARRIER between the foetus and the mother It helps in the EXCHANGE of gasses `(O_2 & CO_2)` between the mother and focus.

Discussion

22267.	Question : Although potato tuber is an underground part, it is considered as a stem. Give two reasons.
Answer» SOLUTION :(a) The tuber has nodes and INTERNODES (as STEM), (B) Leafy shoots APPEAR from the nodes.

Discussion

22268.	Question : Although sexual reproduction is a long drawn, energy - intensive complex form of reproduction, many groups of organisms in Kingdom Animalia and Plantae prefer this mode of reproduction. Give atlest three reasons for this.
Answer» Solution :(a) Variation in the OFFSPRING are produced due to sexual reproduction. (b) Since gamete formation is a result of meiosis, genetic recombination occurring during crossing over (meiosis - I), leads to variation in the DNA of gametes. (c ) The organism have BETTER chances SURVIVAL in a CHANGING environment.

Discussion

22269.	Question : Although a prokaryotic cell has no defined nucleus yet DNA is not scattered throughjout the cell Explain
Answer» Solution :Prokaryotic cells do not have a well defined NUCLEOUS but DNA is not scattered throughout the CELL DNA is held by some protein in a region termed as NUCLEOID prokaryotic cells are surrounded by a PLASMA memebrane and a cell wall

Discussion

22270.	Question : Alternate oxidase is an enzyme of
Answer» EMP pathway Kreb's cycle Photosynthesis Cyanide RESISTANT pathway Answer :D

Discussion

22271.	Question : Alteration in chromosomes results in
Answer» ABNORMALITIES or ABERRATIONS RECOMBINATION or abnormalities Aberrations or REPLICATION Replication or recombination Answer :A

Discussion

22272.	Question : Also describe as to who determines the sex of an unborn child ? Mention whether temperature has a role in sex determination.
Answer» SOLUTION : As a rule the heterogametic organism DETERMINES the SEX of the unborn child. In CASE of humans, since males are heterogametic it is the father and not the mother who decides the sex of the child. In some ANIMALS like crocodiles, it is the temperature which decides the sex of the organism. Lower temperature favour hatching of female offsprings. Higher temperatures lead to hatching of male off springs.

Discussion

22273.	Question : Alpine plants show
Answer» Mesophytism Halophytism Xerophytism LUXURIANT GROWTH ANSWER :C

Discussion

22274.	Question : Alpine vegetation is found in :
Answer» TUNDRA region Arctic desert Above 60ºN latitude All of above Answer :D

Discussion

22275.	Question : Alpine forests of Himalayas have
Answer» TALL evergreen coniferous trees tall broad LEAVED evergreen trees Tall broad leaved deciduous trees Dwarf SHRUBBY plants Answer :A

Discussion

22276.	Question : Alpine forests of Himalayas have dwarf shrubby plants.
Answer» ANSWER :1

Discussion

22277.	Question : Alpha thalassemia is controlled by
Answer» one GENE located on chromosome 11 one gene located on chromosome 16 two gene located on chromosome 11 two gene located on chromosome 16 ANSWER :D

Discussion

22278.	Question : alpha- Thalassemia and beta-Thalassemia linked genes are located on which chromosomes respectively.(A) On 18 and 11(B) On 11 and 16(C) on 16 and 11(D) On 12 and 18
Answer» on 18 and 11 on 11 and 16 on 16 and 11 on 12 and 18 Answer :A

Discussion

22279.	Question : alpha –IFN is used in :-
Answer» CANCER treatment Viral GROWTH inhibition Bacterial growth inhibition Both (1) and (2) ANSWER :D

Discussion

22280.	Question : Alpha globin production for haemoglobin is controlled by
Answer» onegene LOCATION on CHROMOSOME 11 onegene location on chromosome 16 twogene location on chromosome 11 twogene location on chromosome 16 Answer :D

Discussion

22281.	Question : alpha-diversity shows which type of biodiversity?
Answer» In a SINGLE habitat Gradually CHANGING habitats ENTIRE geographical area (A) and (B) both SOLUTION :In a single habitat

Discussion

22282.	Question : alpha helix exhibits _____structure of protein.
Answer» ANSWER :SECONDARY

Discussion

22283.	Question : alpha-1-antitrypsin, a human protein, used for treatment of
Answer» Phenylketonuria Cystic fibrosis Emphysema AIDS Answer :C

Discussion

22284.	Question : alpha-1 antripsin is used in the treatment of ………. .
Answer» phenylketonuria cystic fibrosis emphysema haemophilia Answer :C

Discussion

22285.	Question : alpha-1 antitrypsin is
Answer» an antacid an enzyme used to TREAT arthritis used to treat emphysema Solution :Disorder or `alpha-1-` ANTITRYPSIN PROTEIN include `alpha-1`-antitrypsin deficiency an autosomal codomonant hereditary diosorder which leads to a chronic uninhabited tissue BREAKDOWN. The causes the degradation especially of lung tissue, and eventually leads to CHARACTERSTIC manifestations of pulmonary emphysema.

Discussion

22286.	Question : alpha-1 antitrypsin is(A) An antacid(B) An enzyme(C) Used to treat arthritis(D) Used to treat emphysema
Answer» An antacid An enzyme Used to TREAT arthritis Used to treat emphysema. Solution :`alpha-1` ANTITRYPSIN is used to treat emphysema. It is a protease inhibitor PRODUCED by INTRODUCTION of specific of DNA which codes for a particular product in the transgenic animals. It is used to treat emphysema because it inhibits the enzymes of inflammatory cells causing respiratory complications.

Discussion

22287.	Question :alpha- 1antitrypsinis ahumanprotein thatinhibits
Answer» ELASTASE AMYLASE TRYPSIN Both(a) and(C ) ANSWER :D

Discussion

22288.	Question : Along with auxin, which PGR is used to induce proliferation of cells in callus,
Answer» GA Cytokinin ABA Florigen Answer :B

Discussion

22289.	Question : Almost decomposed organic matter in which original matter in which original form if lost is in
Answer» Duff Litter Leaf mould None of these. Answer :C

Discussion

22290.	Question : Allotropic speciation is
Answer» appearance of NEW species in the same area as the parent population initiated by the appearance of GEOGRAPHICAL isolation Solution :Allopatric speciation is initiated by the appearance of a geographical isolation when two different species will be formed after long time when species formation takes place in same HABITAT then this mode of speciation is KNOWN as sympatric speciation parpatric speciation occurs in geographically adjacent areas

Discussion

22291.	Question : Allopatric speciation occurs when
Answer» GENETICALLY related population INHABIT widely separated GEOGRAPHICAL area genetically un-related POPULATIONS inhabit widely separated geographical area genetically related populations inhabit the same geographical area genetically un-related populations inhabit the same geographical area Answer :A

Discussion

22292.	Question : Allopatric speciation is caused by
Answer» TEMPORAL isolation Adaptive radiation Geographic isolation Reproductive isolation Answer :C

Discussion

22293.	Question : Allogamy is very useful because it results in(A) Formation of male off springs(B) weaker progeny(C) superior progeny(D) formation of seeds
Answer» FORMATION of MALE off springs weaker progeny superior progeny formation of seeds Answer :C

Discussion

22294.	Question : Allogamy is best favoured by :
Answer» Dichogamy Dicliny Cleistogamy Homogamy Answer :A

Discussion

22295.	Question : Allogamy is best favoured by(A) cleistogamy(B) dicliny(C) homogamy(D) none of the above
Answer» CLEISTOGAMY dicline homogamy none of the above Solution :DICLINY : FLOWERS are UNISEXUAL

Discussion

22296.	Question : Allogamy has to be always performed with the help of(A) external agency(B) self mechanism(C) only wind(D) only man
Answer» EXTERNAL agency self mechanism only WIND only man Answer :A

Discussion

22297.	Question : Allen's rule state that
Answer» Mammals from colder climates have larger body size to MINIMIZE heat loss Fishes growing in polar region have LARGE number of vertebrae to maximize heat loss Mammals from colder climates GENERALLY have EXTREMITIES to minimize heat loss Birds found in colder geographical zone have BROADER wings to maximize surface area Answer :C

Discussion

22298.	Question : Allen's rule is with respect to
Answer» Reptiles Mammals Aves Amphibia ANSWER :B

Discussion

22299.	Question : Alleles are
Answer» Different PHENOTYPE True BREEDING homozygotes Different MOLECULAR forms of a gene Heterozygotes Answer :C

Discussion

22300.	Question : Alleles are:
Answer» Heterozygotes Different PHENOTYPE TRUE BREEDING homozygotes Different MOLECULAR FORMS of a gene Answer :D

Discussion

Explore topic-wise InterviewSolutions in .

Question : Amensalism is an association between two species where

Question : Amensalism is called as …………………….

Question : Amensalism is an association between two species where :

Question : Amensalism is an association between two species where:

Question : Name the scientists who propounded the following theories. (a) Mutation theory (b) Chemical theory of evolution

Question : Name the periods of Mesozoic era. Also mention the flora and fauna dominated during that periods.

Question : Name the macro consumers and micro consumers.

Question : Amazonian rain forests have the greatest biodiversity on earth. List any two hypotheses that are proposed by the biologists to account for the greater biological diversity.

Question :''Amazon forest is considered to be the lungs of the planet'' - Justify this statement.

Question : Amazon rain forest has the greatest biodiversityon earth. Listany two hypothese that are proposed by the biologists to accountfor thegreater biological diversity .

Question : Alzheimer disease in humans is associated with the deficiency of :

Question : Alzheimer disease, charactersised by less memory is due to

Question : Alveoli are sites for food exchange.

Question : Although the embryo depends on the mother's blood for its nutition and supply of oxygen, its circulatory system is never directly connected with maternal blood vessels. What will be the effect on the embryo if it is directly connected with maternal blood?

Question : Although the embryo depends on the mother's blood for its nutrition and supply of oxygen, its circulatory system is never directly connected with maternal blood vessels. State two functions of the placenta.

Question : Although potato tuber is an underground part, it is considered as a stem. Give two reasons.

Question : Although sexual reproduction is a long drawn, energy - intensive complex form of reproduction, many groups of organisms in Kingdom Animalia and Plantae prefer this mode of reproduction. Give atlest three reasons for this.

Question : Although a prokaryotic cell has no defined nucleus yet DNA is not scattered throughjout the cell Explain

Question : Alternate oxidase is an enzyme of

Question : Alteration in chromosomes results in

Question : Also describe as to who determines the sex of an unborn child ? Mention whether temperature has a role in sex determination.

Question : Alpine plants show

Question : Alpine vegetation is found in :

Question : Alpine forests of Himalayas have

Question : Alpine forests of Himalayas have dwarf shrubby plants.

Question : Alpha thalassemia is controlled by

Question : alpha- Thalassemia and beta-Thalassemia linked genes are located on which chromosomes respectively.(A) On 18 and 11(B) On 11 and 16(C) on 16 and 11(D) On 12 and 18

Question : alpha –IFN is used in :-

Question : Alpha globin production for haemoglobin is controlled by

Question : alpha-diversity shows which type of biodiversity?

Question : alpha helix exhibits _____structure of protein.

Question : alpha-1-antitrypsin, a human protein, used for treatment of

Question : alpha-1 antripsin is used in the treatment of ………. .

Question : alpha-1 antitrypsin is

Question : alpha-1 antitrypsin is(A) An antacid(B) An enzyme(C) Used to treat arthritis(D) Used to treat emphysema

Question :alpha- 1antitrypsinis ahumanprotein thatinhibits

Question : Along with auxin, which PGR is used to induce proliferation of cells in callus,

Question : Almost decomposed organic matter in which original matter in which original form if lost is in

Question : Allotropic speciation is

Question : Allopatric speciation occurs when

Question : Allopatric speciation is caused by

Question : Allogamy is very useful because it results in(A) Formation of male off springs(B) weaker progeny(C) superior progeny(D) formation of seeds

Question : Allogamy is best favoured by :

Question : Allogamy is best favoured by(A) cleistogamy(B) dicliny(C) homogamy(D) none of the above

Question : Allogamy has to be always performed with the help of(A) external agency(B) self mechanism(C) only wind(D) only man

Question : Allen's rule state that

Question : Allen's rule is with respect to

Question : Alleles are

Question : Alleles are: