24277 + Interview Questions in Biology in Class 12 Page 311 InterviewSolution

15501.	Question : In order to find out the different types of gametes produced by a pea plant having the genotypes AaBb , it should be crossed to a plant with genotypes :
Answer» AABB AaBb aabb aaBB ANSWER :C

Discussion

15502.	Question : In order to explain the mode of inheritance of character through successive generations Mendel proposed that the two alternative factors for each character become separated during the formation of gametes and each factors has an equal chance of being transferred the offsprings. This phenomenon is known as:
Answer» PRINCIPLE of INCOMPLETE dominance principle of segregation none of the above ANSWER :C

Discussion

15503.	Question : In order to find out the diferent types of gametes produced by a pea plant having the genotype AaBb,it should be crossed to a plant with the genotype
Answer» aaBB AaBB AABB aabb Answer :D

Discussion

15504.	Question : In order to build a longitudinal data set, data of adult finches Geospiza fortis living on one of the Galapagos islands were collected. The beak shape data collected between 1971-2001 are shown in the graph. Study the graph and select the correct statement.
Answer» The fluctuating direction in the beak shape is most probable due to change in the environment. The graph as a whole does not indicate evolutionary change in the beak shape as the time interval is too small and evolution requires thousands of years to occur. The graph indicates that the beak shape may lead to convergent EVOLUTIN in the finches of Galapagos inslands. The change in any phenotypic character requires selection to alter the expression of large number of geries in COORDINATED fashion. Henc,e it is unlikely that change in the beak shape depicted in the graph is a RESULT of evolution. Solution :The diversity in beak shape is most probable due to changes in environment which lead to natural selection and gene flow among species. The graph does indicate evolutionary change. It has been SHOWN that evolution can occur with surprising speed, as fast as those resulting from artifical selection. The selection in case of finches was strong and the populations evolved in a matter or generations. The Galapagos finches afford an excellent example of adaptive radiation. It is assumed taht a stock of ancestral finches reached the islands from the mainland and then in the absence of much competition, evolved to fill many of the empty ecological NICHES. There a change in a phenotypic character can be attributed to alteration in the expression of one to several genes. Thus the change in beak shape can be atributed to evolution.

Discussion

15505.	Question : In order to build a longitudianl dataest, data of adult finches Geospiza fortis living on one of the Galapagos islands were collected. The beak shape data collected between 1971-2001 are shown in the graph. Study the graph and select the correct statement.
Answer» The fluctuating direction in the BEAK shape is most probable due to change in the enviorment. The graph as a whole does not indicate EVOLUTIONARY change in the beak shape as the time interval is too small and EVOLUTION requires thousands of years to occur. The graph indicates that the beak shape may lead to convergent evolutin in the finches of Galapagos inslands. The change in any phenotypic character requires selection to alter the expression of large number of geries in coordinated fashion. Henc,e it is unlikely that change in the beak shape depicted in the graph is a result of evolution. Solution :The diversity in beak shape is most probable due to changes in environment which lead to natural selection and gene flow AMONG species. The graph does indicate evolutionary change. It has been shown that evolution can occur with surprising speed, as fast as those resulting from artifical selection. The selection in case of finches was strong and the populations evolved in a matter or generations. The Galapagos finches afford an excellent example of adaptive radiation. It is assumed taht a stock of ancestral finches reached the islands from the mainland and then in the absence of much competition, evolved to fill many of the empty ecological niches. There a change in a phenotypic character can be attributed to alteration in the expression of one to SEVERAL genes. Thus the change in beak shape can be atributed to evolution.

Discussion

15506.	Question : In order for the blood to flow right atrium to left ventricle in mammalian heart, it must flow through
Answer» Right VENTRICLE `RIGHTARROW` PULMONARY vein `rightarrow` Lungs `rightarrow` Pulmonary artery Right ventricle `rightarrow` Pulmonary artery `rightarrow` Lungs `rightarrow` Pulmonary vein Right ventricle `rightarrow` Pulmonary TRUNK `rightarrow` Lungs `rightarrow` AORTA Right ventricle `rightarrow` Aorta `rightarrow` Lungs `rightarrow` Pulmonary trunk Answer :D

Discussion

15507.	Question : In opuntia, leaves are reduced to
Answer» Thorns Prickles Spines Buds ANSWER :C

Discussion

15508.	Question : In Opuntia chlorenchyma are usually found in :
Answer» Roots Stems Leaves Flowers Answer :B

Discussion

15509.	Question : In Ophioglossum somatic chromosome number in 1262.
Answer» ANSWER :1

Discussion

15510.	Question : In Operon model, regulator gene functions as
Answer» REPRESSOR REGULATOR INHIBITOR all of the above SOLUTION :all of the above

Discussion

15511.	Question :In operon model, regulator gene
Answer» stops the formation of R RNA stops TRANSCRIPTION PREVENTS the movement of RNA inactivates the substrate Answer :B

Discussion

15512.	Question : In oogamy, fertilization involves:
Answer» A LARGE non-MOTILE female and a SMALL non-motile male gamete A large motile female gamete and asmall non-motile male gamete A small non-motile female gamete and a large motile male gamete A large non-motile female gamete and a small motile male gamete Answer :D

Discussion

15513.	Question : In oocyte secodary maturation occurs in
Answer» Ovary Abdominal cavity Fallopian tube Uterus ANSWER :C

Discussion

15514.	Question : In oocytes of some vertebrates, diplotene lasts for months or years. It is called
Answer» LEPTOTENE STAGE Dictyotene stage Zygotene stage PACHYTENE stage Answer :B

Discussion

15515.	Question : In one type plant Adventitious buds develops into new leafy shoot by leaf as means of vegetative propagation but in others by rhizome.Give an example for leaf and rhizome used as unit of vegetative propagation.
Answer» SOLUTION :LEAVE- BRYOPHYLLUM, Rhizome-banana and GINGER

Discussion

15516.	Question : In one population, Frequency of X gene =m =80% Frequency of Y gene =n =20% Frequency of XY = % and Frequency of XX = % (Use Hardy-Weinberg law)
Answer» 4%, 32% 64%, 32% 4%, 64% 32%, 64% SOLUTION : 32%, 64%

Discussion

15517.	Question : In one set ofchromosomesfor a givenplant is represented as N, in caseof double fertilization, the zygote and the endosperm nucleus of a diploidplant wouldhave how many sets ofchromosomesrespectively ?
Answer» N and 2N 2Nand2N N and 3N 2N and 3N Solution :In PLANT duringdoublefertilization the zygote is DIPLOID(2n) and the ENDOSPERM is TRIPLOID (3n )

Discussion

15518.	Question : In one strand of DNA has the introgenous base sequence as ATCTG what would be the complementary RNA strand sequence ?
Answer» UAGAC AACTG ATCGU TTAGU Answer :A

Discussion

15519.	Question : In one series of insects males have 17 chromosomes while female have 18 chromosomes. The type of sex determination in that species is
Answer» ZO type ZW type XY type XO type Answer :D

Discussion

15520.	Question : In one polyncleotide strandof a DNA moleculethe ratio of A+T//G+C is 0.3. What is the A+G//T+Cratio of the entire DNA molecule ?
Answer» 0.3 0.6 1.2 1 Solution :(d) : ACCORDING to Chargaff's RULES (1950), purine and pyrimidinebase pairs are present in equal amounts in a DNA molecule. i. E., `[A+G]=[T+C]` or ` ([A+G)]/([T+C)]=1.

Discussion

15521.	Question : In one of the techniques of recombinant insulin production the genes for alpha and beta polypeptides were inserted into the plasmid by the side of:
Answer» ANTIBIOTIC resistance GENE lac Z PROMOTER gene `beta` galactosidase gene ori site Answer :C

Discussion

15522.	Question : In old dicot stems a major part of the wood is filled up with tannins, resins,gums,etc.This part is called
Answer» Heartwood Sapwood Hardwood Softwood Answer :A

Discussion

15523.	Question : In Nostoc, the specialised cells that fix nitrogen are:
Answer» Mycoplasma Chrysophytes Euglenoids Heterocyst Answer :D

Discussion

15524.	Question : In north -easternstate of indiamajor hectorsof forestland isdegradedby a mode of cultivation a) Namethe cultivation method Explain the procedureof this cultivation
Answer» SOLUTION :a) jhumcultivation B) In jhum CULTIVATIONOF slash & burncultivationforestland isconvertedto agriculturalland bycuttingand burningtress,ash obtainedis usedas fertilizerforcrop cultivationand other landis usedfor grazingcattle .The processrepeatedand its leads todeforestation.

Discussion

15525.	Question : In normal plants light saturation occurs at
Answer» 10% of FULL sunlight 50% of full sunlight DOUBLE to full sunlight four TIME to full sunlight Answer :A

Discussion

15526.	Question : in Neurospora ,8 ascopores are foemed ,they are 2A,2a 2A ,2a .It showss :
Answer» no CROSSING over Some meiosis occours first generation diviision SECOND generation division ANSWER :D

Discussion

15527.	Question : In nomenclature of REN (Restriction Endonuclease) Hind III, III stands for ………… .
Answer» GENUS name species name order of discovery strain of the organism Answer :C

Discussion

15528.	Question : In New York at 41^(@)N and in Greenland at 71^(@) N successively how many species of birds are seen ?
Answer» 56, 71 66, 76 105, 56 56, 105 SOLUTION :105, 56

Discussion

15529.	Question : In nitrate assimilation, reduction of nitrate to ammonia is mediated by:
Answer» Nitrate REDUCTASE NITRITE reductase Both (a) and (B) NONE of these Answer :C

Discussion

15530.	Question : In negative operon
Answer» INDUCER BINDS to REPRESSOR Inducer binds to corepressor Corepressor binds to aporepressor A repressor is not formed Answer :C

Discussion

15531.	Question : In nematodes, excretion and osmoregulation is handled by :
Answer» FLAME cell Renette gland Chloragogen cell Green gland Answer :B

Discussion

15532.	Question : In nature, the rate of mutation is
Answer» 1x10-7 1x10-9 1x10-8 1x10-12 ANSWER :A

Discussion

15533.	Question : In natural selection :
Answer» new mutations are generated over time the genetic COMPOSITION of the POPULATION CHANGES at random over time all individuals in a population particular are equally likely to contribute OFFSPRING to the next generation individuals that possess particular heritable characteristics survive and REPRODUCE at a higher rate than other individuals Solution :N/A

Discussion

15534.	Question : In nature, cleistogamous flowers are :
Answer» self-pollinated Insect-pollinated Wind-pollinated Bird-pollinated Answer :A

Discussion

15535.	Question : In Na^+'K^+pump of active transport there is:
Answer» EFFLUX of `NA^+`and INFLUX of K+ Influx of `Na^+`and efflux of `K^+` Only efflux of `Na^+` Influx and efflux of `Na^+` only Answer :A

Discussion

15536.	Question : In mung bean two varieties are developed through mutation breeding for disease resistance. Name the diseases for which thevarieties are produced .
Answer» Solution :RESISTANCE against YELLOW mosiac VIRUS resistance to powdery MILDEW chemicals and RADIATIONS

Discussion

15537.	Question : In multi-factorial inheritance
Answer» Many CHARACTERS are influenced by a simple gene Many genes INFLUENCE a simple character More than ONE allele of a gene is necessary to produce the EFFECT One gene incompletely DOMINATES the effect of its allele Answer :B

Discussion

15538.	Question : In multiple allele system, a gamete has alleles
Answer» One Two Three Many Answer :A

Discussion

15539.	Question : In multi-unit smooth muscles, the different muscle fibres of the group :
Answer» CONTRACT independently Contract simultaneously Do not contract at all FIRST contract and then stimulate other GROUPS for contraction Answer :A

Discussion

15540.	Question : In Mucor and saprolegnia asexual reproduction occur by(A) fission(B) Budding(C) Fragmentation(D) Spore formation
Answer» fission Budding fragmentation SPORE FORMATION ANSWER :C

Discussion

15541.	Question : In________ movement , wateroccurs through thecytoplasm of cells
Answer» SOLUTION : APOPLASTIC

Discussion

15542.	Question : In most mammals, testes are located in scrotal sacs for:
Answer» Sex differentiation Sperm DEVELOPMENT in COOLER condition Independent functioning of kidneys More SPACE to visceral organs Answer :B

Discussion

15543.	Question : In most ecosystem, all the pyramid of numbers, biomass and energy are upright. Why?
Answer» SOLUTION :Because PRODUCERS are morein number and biomass than the herbivores and herbivores are more in number and biomass than the CARNIVORES. That is why most of the PYRAMIDS are upright.

Discussion

15544.	Question : In mosses, spore germinates to produce :
Answer» Protonema Prothallus Embryo Sporophytes Answer :A

Discussion

15545.	Question : In moss sporophyte, whichof the following is present ?
Answer» TRABACULAE PERISTOME COLUMELLA All of these ANSWER :D

Discussion

15546.	Question : In monohybrid cross of red and white flower, Mendel got only red flower. On setting the F, plants having red flower he got both plants with red and white flower. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.
Answer» Solution :On CROSSING red and white FLOWER only red colour flower appeared in the `F_1` generation. But the white colour flower again appears in the `F_1` generation which is raised out of the `F_1` INDIVIDUALS only. Mendel reasoned that there is a factor of each and every character. Accordingly, there has to be one factor(R) for red flower and other one factor (r) for white flower. In case, an organism possess only one copy of the gene then the possibility of reappearance of white flower in the `F_2` generation of the given cross is not there. Also the RATIO (3:1 of red and white) indicates that each organism must possess TWO copies of a particular gene.

Discussion

15547.	Question : In monoecius plants,
Answer» Both autogamy and geitonogamy are prevented Both autogamy and geitonogamy are takes PLACE Autogamy takes place prventing geitonogamy Autogamy is prevented WHEREAS geitonogamy takes place . ANSWER :D

Discussion

15548.	Question : In monocotyledon roots, the histogen present at the apix of the root tip is
Answer» DERMATOGEN PROCAMBIUM CALYPTROGEN Plerome Answer :C

Discussion

15549.	Question : In monocots male gametophyte is represented by
Answer» Ovule Nucellus Pollen grain Megaspore Answer :C

Discussion

15550.	Question : In monocots, graftingis almost impossible because they lack :
Answer» Cambium Ground tissue Vascular bundle Parenchymatous cells Answer :A

Discussion

Explore topic-wise InterviewSolutions in .

Question : In order to find out the different types of gametes produced by a pea plant having the genotypes AaBb , it should be crossed to a plant with genotypes :

Question : In order to find out the diferent types of gametes produced by a pea plant having the genotype AaBb,it should be crossed to a plant with the genotype

Question : In order to build a longitudinal data set, data of adult finches Geospiza fortis living on one of the Galapagos islands were collected. The beak shape data collected between 1971-2001 are shown in the graph. Study the graph and select the correct statement.

Question : In order to build a longitudianl dataest, data of adult finches Geospiza fortis living on one of the Galapagos islands were collected. The beak shape data collected between 1971-2001 are shown in the graph. Study the graph and select the correct statement.

Question : In order for the blood to flow right atrium to left ventricle in mammalian heart, it must flow through

Question : In opuntia, leaves are reduced to

Question : In Opuntia chlorenchyma are usually found in :

Question : In Ophioglossum somatic chromosome number in 1262.

Question : In Operon model, regulator gene functions as

Question :In operon model, regulator gene

Question : In oogamy, fertilization involves:

Question : In oocyte secodary maturation occurs in

Question : In oocytes of some vertebrates, diplotene lasts for months or years. It is called

Question : In one type plant Adventitious buds develops into new leafy shoot by leaf as means of vegetative propagation but in others by rhizome.Give an example for leaf and rhizome used as unit of vegetative propagation.

Question : In one population, Frequency of X gene =m =80% Frequency of Y gene =n =20% Frequency of XY = % and Frequency of XX = % (Use Hardy-Weinberg law)

Question : In one set ofchromosomesfor a givenplant is represented as N, in caseof double fertilization, the zygote and the endosperm nucleus of a diploidplant wouldhave how many sets ofchromosomesrespectively ?

Question : In one strand of DNA has the introgenous base sequence as ATCTG what would be the complementary RNA strand sequence ?

Question : In one series of insects males have 17 chromosomes while female have 18 chromosomes. The type of sex determination in that species is

Question : In one polyncleotide strandof a DNA moleculethe ratio of A+T//G+C is 0.3. What is the A+G//T+Cratio of the entire DNA molecule ?

Question : In one of the techniques of recombinant insulin production the genes for alpha and beta polypeptides were inserted into the plasmid by the side of:

Question : In old dicot stems a major part of the wood is filled up with tannins, resins,gums,etc.This part is called

Question : In Nostoc, the specialised cells that fix nitrogen are:

Question : In north -easternstate of indiamajor hectorsof forestland isdegradedby a mode of cultivation a) Namethe cultivation method Explain the procedureof this cultivation

Question : In normal plants light saturation occurs at

Question : in Neurospora ,8 ascopores are foemed ,they are 2A,2a 2A ,2a .It showss :

Question : In nomenclature of REN (Restriction Endonuclease) Hind III, III stands for ………… .

Question : In New York at 41^(@)N and in Greenland at 71^(@) N successively how many species of birds are seen ?

Question : In nitrate assimilation, reduction of nitrate to ammonia is mediated by:

Question : In negative operon

Question : In nematodes, excretion and osmoregulation is handled by :

Question : In nature, the rate of mutation is

Question : In natural selection :

Question : In nature, cleistogamous flowers are :

Question : In Na^+'K^+pump of active transport there is:

Question : In mung bean two varieties are developed through mutation breeding for disease resistance. Name the diseases for which thevarieties are produced .

Question : In multi-factorial inheritance

Question : In multiple allele system, a gamete has alleles

Question : In multi-unit smooth muscles, the different muscle fibres of the group :

Question : In Mucor and saprolegnia asexual reproduction occur by(A) fission(B) Budding(C) Fragmentation(D) Spore formation

Question : In________ movement , wateroccurs through thecytoplasm of cells

Question : In most mammals, testes are located in scrotal sacs for:

Question : In most ecosystem, all the pyramid of numbers, biomass and energy are upright. Why?

Question : In mosses, spore germinates to produce :

Question : In moss sporophyte, whichof the following is present ?

Question : In monohybrid cross of red and white flower, Mendel got only red flower. On setting the F, plants having red flower he got both plants with red and white flower. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.

Question : In monoecius plants,

Question : In monocotyledon roots, the histogen present at the apix of the root tip is

Question : In monocots male gametophyte is represented by

Question : In monocots, graftingis almost impossible because they lack :