24277 + Interview Questions in Biology in Class 12 Page 463 InterviewSolution

23101.	Question : A population growing in a habitat with limited resources shows four phases of growth in the following sequence
Answer» Acceleration - deceleration - LAG phase. ASYMPTOTIC Asymptotic - acceleration - deceleration - lag phase Lag phase - acceleration - deceleration - asymptotic Acceleration - lag phase - deceleration - asymptotic ANSWER :C

Discussion

23102.	Question : A population contains equal number of individuals with the genotype AA and Aa. Proportion of alleles A & a in their gametes will be :-
Answer» `3:1` `1:1` `1:2` Can't be determined Answer :A

Discussion

23103.	Question : A population has more young individuals compared to the older individuals. What would be 'the status of the population after some years?
Answer» It will DECLINE. It will stabilise. It will increase. It will FIRST decline and then stabilise. Answer :B

Discussion

23104.	Question : A polyploid derved from F_(1) hybrid between two species is :
Answer» autoodiploid hexaploid autopolyploid amphdioid Answer :D

Discussion

23105.	Question : A polypeptide of 600 amino acids will be coded for by a linear-sequence of how many bases in (a) mRNA and (b) DNA?
Answer» SOLUTION : (a) 1800, (B) 1800.

Discussion

23106.	Question : [A]: Polyploidy increases the tolerance of plants towards extreme climates. [R]: Autopolyploids produce seed less fruits.
Answer» If both A and R are true and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :B

Discussion

23107.	Question : [A]: Polymerase chain reaction (PCR) fol- lowed by DNA probe is used during DNA fin- ger printing. [R]: A DNA finger print is inherited and, there- fore, resembles that of parent
Answer» If both A and R are TRUE and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false ANSWER :B

Discussion

23108.	Question : A polypeptide is assembled on :
Answer» Ribosomes DNA RNA Nucleolus Answer :A

Discussion

23109.	Question : A polycistronic structural gene of lac operon is regulated by
Answer» A COMMON promoter and operator genes Promotor gene only A common promoter and REGULATORY genes Regulatory gene only Answer :C

Discussion

23110.	Question : A pollination mechanism some what similar to Anthocephalus, kigelia is seen in ?
Answer» Najas Cucurbita Adansonia Calotropis Answer :C

Discussion

23111.	Question : A polymer of identical mono-saccharides.
Answer» ANSWER :Homopolysaccharide

Discussion

23112.	Question : [A]: Pollination is essential for fertilization. [R]: Abscission or drooping of ovary is prented by pollination.
Answer» If both A and R are true and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false Answer :B

Discussion

23113.	Question : A policeman finds a very small piece of body tissue from the site of crime and takes it to the forensic department: (a) By which technique will they amplify the DNA collected from the tissue sampJe? (b) Mention in a sequence, the 3 steps involved in each cycle of this technique. (c) What is the role of thermostable DNA polymerase in this technique?
Answer» Solution :(a) PCR/Polymerase CHAIN REACTION. (B) Denaturation, Annealing, and Extension. (c) This enzyme remains ACTIVE even during high temperature-induced denaturation of double-stranded DNA.

Discussion

23114.	Question : A policeman finds a very small piece of body tissue from the site of a crime and takes it to the forensic department. a. By which technique will they amplify the DNA collected from the tissue sample? b. Mention in a sequence, the three steps involved in each cycle of this technique. c. What is the role of thermostable DNA polymerase in this technique?
Answer» Solution :a. DNA fingerprinting is very useful technique to identify criminals in the forensic laboratories. b. i. DNA is cut into fragments with RESTRICTION enzymes into precise reproducible sequence. ii. Separated DNA sequence are transformed on to a nitro cellulose or nylon membrane. iii. This sequence probes target a specific nucleotide sequence that is complementary to them. c. DNA is extracted from the CELLS in a high speed REFRIGERATED centrifuge and many copies of the extracted DNA are made by POLYMERASE chain reaction.

Discussion

23115.	Question : [A] : Poisons like cyanide inhibit Na^+ efflux and K^+ influx during cellular transport. ATP supply required for the Na^+ and K^+exchange pump is stopped.
Answer» If both A and R are true and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :A

Discussion

23116.	Question : A point at which illuminated plant parts stop absorbing CO_2 from their environment , is known is
Answer» `CO_2` COMPENSATION POINT `CO_2` saturation point `CO_2` OPTIMUM point `CO_2` limiting point Answer :A

Discussion

23117.	Question : A pot bears fruit, has a column of vascular tissue and a tap root system. This plant is a/an
Answer» ANGIOSPERM and DICOT GYMNOSPERM and dicot Angiosperm and MONOCOT Gymnosperm and monooot ANSWER :A

Discussion

23118.	Question : A pleiotropic gene
Answer» CONTROLS multiple traitsin an individual Is EXPRESSED only N primitive plants Is a gene EVOLVED during Policene Controls a trait only in combination with another gene Answer :A

Discussion

23119.	Question :A plastic sac manufacturer in Bangalor /Bengaluru that has managed to find the ideal solution to the ever increasing problem of accumulating plastic waste, is
Answer» Ramesh CHANDRA Dagar Ahmad Khan SUNDAR Lal Bahuguna Ahmed Khan Solution : A plastic sac manufacturer in Bangalore/Bengaluru that has managed to find the ideal solution to the ever- increasing problem of ACCUMULATING plastic waste, is Ahmed Khan.

Discussion

23120.	Question : A plasmolysed cell when placed in a solution becomes deplasmolysed. The solution is:
Answer» Isotonic Toxic Hypotonic Hypertonic Answer :C

Discussion

23121.	Question : [A]: Plasmids are small accessory rings of DNA found in some bacteria that carry genes. [R]: Plasmids that are used as a vector have been removed from bacteria and have had a foreign gene inserted into them
Answer» If both A and R are TRUE and R is the CORRECT explanation of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false ANSWER :A

Discussion

23122.	Question : A plasmid without a selectable marker was chosen as vector for cloning a gene. How does this affect the experiment?
Answer» Solution :In the absence of SELECTABLE MARKER the transformed cells WOULD not be differentiated from non-transformed cells in the culture medium, Le., cells with recombinant DNA and without vector DNA will not be distinguished

Discussion

23123.	Question : A plasmid without a selectable marker was chosen as vector for cloning a gene. How does this affect the experiment ?
Answer» SOLUTION :It is very DIFFICULT to distinguish transformant and non-tranformants. Selectable markers help in selecting the transformed plasmid. The experiment is affected as one can make SURE the PRESENCE of RECOMBINANT plasmid in the vector.

Discussion

23124.	Question : A plasmid DNA and a linear DNA (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis, plasmid shows one DNA band while linear DNA shows two fragments. Explain.
Answer» Solution : It is because plasmid is a circular DNA molecule. When cut with enzyme, it becomes linear but does not get FRAGMENTED. Whereas, a linear DNA molecule gets cut into TWO FRAGMENTS. Hence, a single DNA band is OBSERVED for plasmid while two DNA BANDS are observed for linear DNA in agarose gel.

Discussion

23125.	Question : A plasmid has two antibiotic-resistance genes, one for tetracycline. It is treated with a restriction enzyme that cuts in the middle of the ampicillin gene. DNA fragments containing a haemoglobin gene were cut with the same enzyme. The plasmids and fragments are mixed, treated with ligase and used to transform bacterial cells. Clones that have taken up the recombinant DNA are the ones that
Answer» can GROW on plates with both ANTIBIOTICS can grow on plates with ampicillin but not with tetracycline can grow on plates with tetracycline but not with ampicillin cannot grow with any ANTIBIOTIC Answer :C

Discussion

23126.	Question : A plasmid DNA and a linear DNA (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis, plasmid shows one DNA band while linear DNA shows two fragments. Explain
Answer» Solution :PLASMID DNA is circular, when CUT by endotlllclease it BECOMES linear but is not divided. into segments. Therefore, it forms a single band on agarose gel. A linear DNA will get cut into TWO segments by endonuclease and will form two bands on agarose gel

Discussion

23127.	Question : A plasmid and a DNA sequence in a cell need to be cut for producing recombinant DNA. Name the enzyme which acts as a molecular scissors to cut the DNA segments.
Answer» SOLUTION :RESTRICTION enzyme/restriction ENDONUCLEASE

Discussion

23128.	Question : The enzyme used to cut the DNA molecule is
Answer» ANSWER :RESTRICTION ENZYME

Discussion

23129.	Question : A plasmid :
Answer» Cannot REPLICATE Can replicale INDEPENDENTLY SHOWS independent assortment Lies TOGETHER with chromosomes SOLUTION :Can replicate independently

Discussion

23130.	Question : A plant with red flowers was crossed with another plant with yellow flowers. If F_1 showed all flowers orange in colour, explain the inheritance.
Answer» SOLUTION :This is due to the incomplete DOMINANCE as the F do not resemble EITHER of the two parents and is in between the two. As there is blending of TRAITS.

Discussion

23131.	Question : A plant with Rr genotype is crossed with a plant with rr genotype, the ratio of Rr and rr genotypes will be_____in the next progeny.
Answer» ANSWER :1:1

Discussion

23132.	Question : A plant which successfully completed its life cycle in space _____
Answer» SOLUTION :ARABIDOPSIS

Discussion

23133.	Question : A plant with genotype AaBbCc will produce____number of gametes.
Answer» ANSWER :MULTIPLE

Discussion

23134.	Question : A plant which produces vegetative or adventitious buds on roots ………
Answer» SOLUTION :Millingtonia / Murraya / DALBERGIA

Discussion

23135.	Question : A plant which is a natural autotriploid _____
Answer» SOLUTION :Cyanodon dactylon

Discussion

23136.	Question : A plant which can tolerate cadmium poisoning _____
Answer» MAIZE SOYABEAN Pear MANGO Answer :B

Discussion

23137.	Question : A plant where endangered genetic material of plants are kept is
Answer» GENE library Gene bank Gene pool Herbarium Answer :B

Discussion

23138.	Question : A plant surviving for few days
Answer» Annual Ephermeral Biennial Perennial ANSWER :B

Discussion

23139.	Question : A plant species A has a diploid number of chromosomes as 12. Another plant species B has a diploid chromosome number off 16. The allopolyploid developed. By hybridization of A and B shall have a diploid chromosome number as
Answer» 14 28 40 56 Answer :B

Discussion

23140.	Question : A plant species A has a diploid chromosome number of 12. Another plant species B has a diploid chromosome number of 16. the allopolyploid developed by hybridisation of A and B shall a diploid chromosome number as
Answer» 14 28 40 56 Answer :B

Discussion

23141.	Question : A plant root cell has 16 chromosomes thus:
Answer» GAMETE has 16 chromosomes Gamete has 8 chromosomes Endosperm has 16 chromosomes Endosperm has 8 chromosomes Answer :A

Discussion

23142.	Question : A plant requires magnesium for:
Answer» PROTEIN synthesis Chlorophyll synthesis Cell WALL development Holding CELLS together Answer :B

Discussion

23143.	Question :A plant of F_1 - generation has genotype ‘AABbCC’ . On selfing of this plant . the phenotypic ratio in F_2 -generation will be
Answer» `3:1` `1:1` `9:3:3:1` `27:9:9:3:3:3:1` ANSWER :A

Discussion

23144.	Question : A plant in which sporophytic generation is represented by zygote is
Answer» Pinus Selaginella Chlamydomonas Dryopteris Solution :(c) In Chlamydomonas, the plant body is HAPLOID, and representts gametophyte.It reproduces asexually through the FORMATION of zoospores and sexuallythrough gametes.Gametes (haploid) fuse to produce diploid zygote, representing the sporophytic generation.The zygote secretes a wall around it to become a RESTING ZYGOSPORE(diploid).The zygote and zygospore are the only diploid structure which represents the diplophase.

Discussion

23145.	Question : A plant is growing in soil Which becomes nitrogen deficient due to some reason the deficiency symptoms due to nitrogen will b seen
Answer» FIRST in YOUNG leaves First in OLDER leaves Together inyoung and older leaves First in DEVELOPING tissues Answer :B

Discussion

23146.	Question : A plant in which fibres remain living for upto 20 years is
Answer» tramarix aphylla casarina equisetifalia CAPPARIS decidua mangifera indica. Answer :a

Discussion

23147.	Question : A plant in which both stem and roots are modified is :
Answer» Asparagus Dioscorea Ipomoea Mirabillis Answer :A

Discussion

23148.	Question : A plant in which environment plays a role in sexual determination is
Answer» PEA MAIZE EQUISETUM sphaerocarpos ANSWER :C

Discussion

23149.	Question : A plant hormone that is used to kill dicotyledonous weed and is also known as 'Agent Orange' is derived from
Answer» Tryptophan Phenylalanine Acetyl CoA Modified purines Answer :A

Discussion

23150.	Question : A plant having seeds nut lacking flowers and fruits belongs to
Answer» pteridophytes mosses ferns GYMNOSPERMS Solution :(d) Gymnosperms (Gk Gymno=naked , sperma-seed) are commonlyknown as naked seed PLANTS because their ovules (which later become seeds) are not coveredand lie naked on the surfaces of specialised leaves called megasporophylls or ovuliferous scales, ARRANGED into CONES, FLOWERS are absent, seed may have two, (e.g.Cycas) or more (e.g. Pinus) cotyledons.

Discussion

Explore topic-wise InterviewSolutions in .

Question : A population growing in a habitat with limited resources shows four phases of growth in the following sequence

Question : A population contains equal number of individuals with the genotype AA and Aa. Proportion of alleles A & a in their gametes will be :-

Question : A population has more young individuals compared to the older individuals. What would be 'the status of the population after some years?

Question : A polyploid derved from F_(1) hybrid between two species is :

Question : A polypeptide of 600 amino acids will be coded for by a linear-sequence of how many bases in (a) mRNA and (b) DNA?

Question : [A]: Polyploidy increases the tolerance of plants towards extreme climates. [R]: Autopolyploids produce seed less fruits.

Question : [A]: Polymerase chain reaction (PCR) fol- lowed by DNA probe is used during DNA fin- ger printing. [R]: A DNA finger print is inherited and, there- fore, resembles that of parent

Question : A polypeptide is assembled on :

Question : A polycistronic structural gene of lac operon is regulated by

Question : A pollination mechanism some what similar to Anthocephalus, kigelia is seen in ?

Question : A polymer of identical mono-saccharides.

Question : [A]: Pollination is essential for fertilization. [R]: Abscission or drooping of ovary is prented by pollination.

Question : [A] : Poisons like cyanide inhibit Na^+ efflux and K^+ influx during cellular transport. ATP supply required for the Na^+ and K^+exchange pump is stopped.

Question : A point at which illuminated plant parts stop absorbing CO_2 from their environment , is known is

Question : A pot bears fruit, has a column of vascular tissue and a tap root system. This plant is a/an

Question : A pleiotropic gene

Question :A plastic sac manufacturer in Bangalor /Bengaluru that has managed to find the ideal solution to the ever increasing problem of accumulating plastic waste, is

Question : A plasmolysed cell when placed in a solution becomes deplasmolysed. The solution is:

Question : [A]: Plasmids are small accessory rings of DNA found in some bacteria that carry genes. [R]: Plasmids that are used as a vector have been removed from bacteria and have had a foreign gene inserted into them

Question : A plasmid without a selectable marker was chosen as vector for cloning a gene. How does this affect the experiment?

Question : A plasmid without a selectable marker was chosen as vector for cloning a gene. How does this affect the experiment ?

Question : A plasmid DNA and a linear DNA (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis, plasmid shows one DNA band while linear DNA shows two fragments. Explain.

Question : A plasmid DNA and a linear DNA (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis, plasmid shows one DNA band while linear DNA shows two fragments. Explain

Question : A plasmid and a DNA sequence in a cell need to be cut for producing recombinant DNA. Name the enzyme which acts as a molecular scissors to cut the DNA segments.

Question : The enzyme used to cut the DNA molecule is

Question : A plasmid :

Question : A plant with red flowers was crossed with another plant with yellow flowers. If F_1 showed all flowers orange in colour, explain the inheritance.

Question : A plant with Rr genotype is crossed with a plant with rr genotype, the ratio of Rr and rr genotypes will be_____in the next progeny.

Question : A plant which successfully completed its life cycle in space _____

Question : A plant with genotype AaBbCc will produce____number of gametes.

Question : A plant which produces vegetative or adventitious buds on roots ………

Question : A plant which is a natural autotriploid _____

Question : A plant which can tolerate cadmium poisoning _____

Question : A plant where endangered genetic material of plants are kept is

Question : A plant surviving for few days

Question : A plant species A has a diploid number of chromosomes as 12. Another plant species B has a diploid chromosome number off 16. The allopolyploid developed. By hybridization of A and B shall have a diploid chromosome number as

Question : A plant species A has a diploid chromosome number of 12. Another plant species B has a diploid chromosome number of 16. the allopolyploid developed by hybridisation of A and B shall a diploid chromosome number as

Question : A plant root cell has 16 chromosomes thus:

Question : A plant requires magnesium for:

Question :A plant of F_1 - generation has genotype ‘AABbCC’ . On selfing of this plant . the phenotypic ratio in F_2 -generation will be

Question : A plant in which sporophytic generation is represented by zygote is

Question : A plant is growing in soil Which becomes nitrogen deficient due to some reason the deficiency symptoms due to nitrogen will b seen

Question : A plant in which fibres remain living for upto 20 years is

Question : A plant in which both stem and roots are modified is :

Question : A plant in which environment plays a role in sexual determination is

Question : A plant hormone that is used to kill dicotyledonous weed and is also known as 'Agent Orange' is derived from

Question : A plant having seeds nut lacking flowers and fruits belongs to