24277 + Interview Questions in Biology in Class 12 Page 467 InterviewSolution

23301.	Question : A mutant variety of castor produced to bring in early maturity is _____
Answer» SOLUTION :CASTOR ARUNA

Discussion

23302.	Question : A mutant strain to T_4-Bacteriophage, R-II, fails to lyse the E.coli but when two strains R-II^x and R-II^y are mixed then they lye the E.coli. What may be the possible reason :
Answer» BACTERIOPHAGE TRANSFORMED in wild It is not mutated Both STRAINS have SIMILAR cistrons Both strains have DIFFERENT cistrons Answer :D

Discussion

23303.	Question : A multinational company (XYZ) marketed a medicine extracted from medicinal herbs grown in the sprawling fields in a foreign country. This herb is found only in our country and no compensation was paid or permission taken from relevant authorities i) What is the term used to refer to such an act committed by the multination al company? ii. Justify the meaning of the term. ii. What has our government done to prevent such deeds?
Answer» Solution :i. Biopiracy ii. Biopiracy is the use of bioresources by multinational companies and other organisations without proper authoritisation from the coun TRIES and people CONCERNED without compensatory payment.201 iii. The INDIAN Parliament has recently cleared the second amend ment of the Indian Patent Bill, that takes such issues into consider ation, including patent terms, EMERGENCY provisions and research and development initiative.

Discussion

23304.	Question :A multinational company (XYZ) marked a medicine extracted from medicinal herbs grown in the sprawling fields in a foreign country. This herb is found only in our country and no compensation was paid or permission taken from relevant authority.(a) What is the term used to refer to such an act committed by the multinational company? (b) Justify the meaning of the term. (c) What has our government done to prevent such deeds?
Answer» SOLUTION : (a) Biopiracy (b) Biopiracy tantamounts to stealing of bioresources of another country. (c) GOVERNMENT is developing law such as INDIAN PATENTS Bill to prevent biopiracy.

Discussion

23305.	Question : A multinational company outside India tried to sell new varieties of turmeric without proper patent rights. What is such an act referred to
Answer» ANSWER :BIOPIRACY

Discussion

23306.	Question : A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has.
Answer» HAPLOID vegetative cells and DIPLOID GAMETANGIA Diploid vegetative cells and diploid gametangia Diploid vegetative cells and haploid gametangia Haploid vegetative cells and haploid gametangia. Solution :Adult filament of a multicellular, filamentous alga have haplontic LIFE cycle in which the meiotic division occurs after the formation of zygote. So, the filament of this alga have haploid vegetative cells and haploid gametangia.

Discussion

23307.	Question : A multicelluar, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has
Answer» HAPLOID VEGETATIVE CELLS and DIPLOID GAMETANGIA diploid vegetative cells and diploid gemtangia diploid vegetative cells and haploid gametangia haploid vegetative cells and haploid gemetangia. Answer :d

Discussion

23308.	Question :A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occursjust after the formation of zygote. The adult filament of the alga has :-
Answer» HAPLOID vegetative CELLS and DIPLOID gametangia diploid vegetative cells and diploid gametangia diploid vegetative cells and haploid gametangia haploid vegetative cells and haploid gametangia ANSWER :D

Discussion

23309.	Question : A :MTP become necessary when it is due to rape/of result of rape. R :MTP can be done after 24 to 30 weeks of pregnancy .
Answer» A & R are CORRECT , R is explanation of A A & R are correct , R is not the explanation of A A is correct, R is incorrect A is incorrect , R is correct ANSWER :C

Discussion

23310.	Question : A mRNA strand has a series of triplet codons of which the first three codons are given below (a) AUG(b) UUU (c) UGC (i) Name the amino acid encoded by these triplet codons.(ii) Mention the DNA sequence from which these triplet codons would have transcribed?
Answer» Solution :(i) AUG codes for Methionine UUU codes for PHENYLALANINE UGC codes for Cysteine (ii)TAC sequence of DNA is transcribed to AUG AAA sequence of DNA is transcribed to UUJU ACG sequence of DNA is transcribed to UGC

Discussion

23311.	Question : A mRNA molecule is produced by
Answer» Replication TRANSCRIPTION Duplication Translation Solution :Transcription

Discussion

23312.	Question : A motile colonial form consisting of definite number of cells.
Answer» ANSWER :COENOBIUM

Discussion

23313.	Question : A mother of one year old child wanted to space her second child. Her doctor suggested CuT. Explain its contraceptive actions.
Answer» Solution :CuT is Intra Uterine DEVICE. It INCREASES PHAGOCYTOSIS of sperms within the uterus and Cu ions RELEASED suppress sperm motility and the FERTILISING capacity of sperms. It makes the uterus unsuitable for implantation and the cervix hostile to the sperms. It is an ideal contraceptive for female.

Discussion

23314.	Question : A mother of one year old daughter wanted to space her second child. Her doctor suggested CuT. Explain its contraceptive actions.
Answer» SOLUTION :Copper-T causes mechanical obstruction during IMPLANTATION of egg in UTERUS, copper IONS also cause spermicidal effect and THUS bring about contraception.

Discussion

23315.	Question : [A] : Most of the solutes in ECF and cytoplasm are electrolytes, i.e., electrically charged par- ticles or ions. Maintenance of an equilibrium between intracellular fluid and ECF is vitally essential for all cells. [R]: This osmotic equilibrium is maintained by sodium and potassium pump of the cells. It operates with the help of a Na^+,K^+ATP as enzyme located in the cell membrane.
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

23316.	Question : A mother of blood groupO has a group O child , the father could be
Answer» A or B or O O only A or B AB only Answer :A

Discussion

23317.	Question : A mother of a one-year-old daughter wanted to spaceher second child. Suggest the best method for contraceptive actions.
Answer» Solution :Natural methods, BARRIER methods,IUDS,ORAL CONTRACEPTION, implants and injections and SURGICAL methods.

Discussion

23318.	Question : A: More than one pollen tubes can enter an embryo sac R: Double fertization can occur by contributin of gametes from different pollens
Answer» if both ASSETION A reason are ture and the reason is the correct EXPLANATION of the assertion then mark if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark if assertion is true statement but reason is FALSE then mark if both assertion and reason are FLASE statements then mark Answer :B

Discussion

23319.	Question : A : Montreal protocol suggested the reduction of ODS. R : A land mark international agreement taken in Earth summit held at Rio de Janeiro.
Answer» If both Assertion & Reason are TRUE and the reason is the correct explanation of the assertion, then mark (1). If both Assertion & Reason are ture but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true statement but Reason is false, then mark (3). If both Assertion and Reason are false statements, then mark (4). Answer :C

Discussion

23320.	Question : A monopoly granted to a person who as either invented a new and useful article, made improvement in an article or invented a new process of making an article is called
Answer» BIOPIRACY Bioethics PATENT GENETIC modification Solution :Patent

Discussion

23321.	Question : A monohybrid cross between two plants, one having 24 cm long internode and other having 12 cm long internode, produces F_(1) hybrid, all having 18 cm long internodes. This is a case of
Answer» COMPLETE dominance Incomplete dominance Co-dominance Multiple allelism Answer :B

Discussion

23322.	Question : A monopoly granted to a person who has either invented a new and useful article, made inprovement in an existing article or invented a new process of making an article is called
Answer» biopiracy bioethics patent genetic modification Solution :A patent is the right granted by government to an inventor to prevent others from commercial use of his invention. When patents are granted for biological entities and for products DERIVED from them, these patents are called biopatents. Primary industrialised COUNTRIES, LIKE U.S.A Japan and members of EUROPEAN Union, are awarding biopatents.

Discussion

23323.	Question : A molecule that can act as a genetic material must fulfill the traits given below, except
Answer» it should be able to express itself in the FORM of 'Mendelian CHARACTERS' it should be able to generate its replica it should be unstable STRUCTURALLY and chemically it should provide the scope for slow changes that are required for EVOLUTION Solution :it should be unstable structurally and chemically

Discussion

23324.	Question : A monocot root differs from a dicot root by the presence of
Answer» Exodermis piliferous layer Exarch xylem Large pith Answer :D

Discussion

23325.	Question : A molecule that acts as a genetic material must fulfill the following criteria. except
Answer» It should be structurally and chemically unstable It should have the ability to generate its REPLICA It should facilitate slow changes NECESSARY for EVOLUTION. It should be able to express itself in the from of Mendelian characters. Answer :A

Discussion

23326.	Question : A mode of sexual reproduction.(A) Conjugation(B) Binary fission(C) Multiple fission(D) Fragmentation
Answer» Conjugation Binary FISSION MULTIPLE fission FRAGMENTATION ANSWER :A

Discussion

23327.	Question : A mixture of heat-killed NL cells (dead cells) and live L-cells is injected into mice.NL- type cells are pathogenic, develop a disease and kill the animals. On the other hand L-type cells are non-pathogenic. The expected result could be
Answer» mice develop DISEASE and die mice die without DEVELOPING disease mice do not develop disease and ALSO do not die 50% mice develop disease and die Answer :A

Discussion

23328.	Question : A mixture of fragmented DNA was electrophoresed in an agarose gel. After staining the gel with ethidium bromide, no DNA bands were observed. What could be the reasons?
Answer» SOLUTION :The reasons may be: (a) DNA fragments have got completely degraded by enzymes (EXO or endo nucleases or both) which may be present in the solution. (B) UV radiations were not used. (c) Electrodes are not fitted properly

Discussion

23329.	Question : A mixture DNA fragments A, B, C and D with molecular weights of A + B = C gt B and D gt C was subjected to agarose gel electrophoresis. The position of these fragments from cathode to anode sides of the gel would be
Answer» B, A, C, D A,B,C,D C, A, B, D B,A,D,C SOLUTION :B, A, C, D

Discussion

23330.	Question : A. mixture electrophoresed in an agarose gel. After staining of fragmented DNA was the gel with ethidium bromide, no DNA bands were observed. What could be the reason ?
Answer» Solution :The reasons are as follows : (i) DNA sample that was loaded on the GEL MAY have got contaminated with nuclease (exo-or endo-or both) and completely degraded. (ii) Electrodes were put in opposite orientation in the gel assembly that is anode towards the wells (where DNA sample is loaded). Since DNA molecules are-negatively charged, they MOVE towards anode and hence move out of the gel instead of moving into the matrix of gel. (iii) Ethidium bromide was not added at all or was not added in SUFFICIENT concentration and so DNA was not visible.

Discussion

23331.	Question : A mixturecontainingDNA fragmentsa,b,cand dwith molecularweights of aofa+ b = c,alt band d lt c was subject to agarose gelelectronphoresis. Theposition of thesefragments from cathode toanodesides of the gelworld.
Answer» b,a,C,d a,b,c,d d,c,a,b b,a,d,c Answer :C

Discussion

23332.	Question : A mink breeder finds that 50 % of the offspring are aa. What genotype were their parents ?
Answer» AA x aa Aa x Aa aa x aa Aa x aa Solution :USE your BASIC genetic KNOWLEDGE 1.`underset"% aa"("100% aa")` 2.25 % AA, 50 % Aa, 25 3.100 Aa , 4. 50% Aa, 50% aa.

Discussion

23333.	Question : A mineral nutrient will be considered as toxic when-
Answer» It inhibits REPRODUCTION is plants It increase accumulation of secondary metabolites It decrease the DRY WEIGHT more than ten PERCENT It inhibits photosynthesis Answer :C

Discussion

23334.	Question : [A]: Mimics are always or more often defenceless.[R]: Mimics are always less in number than the model individuals
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

23335.	Question : a. Militaryperson are used to wearuniformgreencolour withmarksof leaves and twigs .some brids and butterfliesare showingmarkingsand scars same as that of thesurroundings. b.Concealing form andcoluration enable someorgansimto avioditsnatural predation .Explainthe behavioural strategies of suchorganisms.
Answer» SOLUTION :a . ITIS DUE to matchor blendwith surroudingsfor ESCAPING or toprotectthemselvesfrom the naturalpredators. B. Cammouflage

Discussion

23336.	Question : A milch breed of cattle quite common in Punjab. Haryana and Uttar Pradesh is
Answer» Deoni SAHIWAL Hallikar Malvi SOLUTION :Sahiwal

Discussion

23337.	Question : A microspore mother cell forms(A) embryo sac(B) pollen Grains(C) nucellus(D) tapetum
Answer» EMBRYO sac pollen Grains nucellus NUCLEUS tapetum Answer :A

Discussion

23338.	Question : A microphyllous, heterosporous, pteridophyte belonging to sphenophyta and havingectophloic siphonostele is
Answer» EQUISETUM Salvinia Selaginella Dryopteris Answer :A

Discussion

23339.	Question : A method of sexual reproduction where gamete are exchange through temporary cytoplasmic bridge. (A) Runner (B) Binary fission (C) Sporulation (D) Conjugation
Answer» Runner Binary FISSION Sporulation Conjugation ANSWER :D

Discussion

23340.	Question : Which one is the method of birth control ?
Answer» GIFT ZIFT IVF-ET IUDs Answer :D

Discussion

23341.	Question : A method in which roots are induced on the stem branch, while it is still attached to the parent plant, is called
Answer» CUTTING GRAFTING LAYERING Vivipary Answer :4

Discussion

23342.	Question : [A]: Metacentric chromosomes are V-shaped [R]: In these chromosomes, the centromere occurs in the centre forming two equal arms.
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

23343.	Question : [A]: Metacentric chromosomes are V- shaped. [R]: In these chromosomes the centromere occurs in the centre and forming two equal arms.
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

23344.	Question : [A]: Meselson and Stahl tested the Watson and Crick Theory of DNA replication. [R]: They confirmed the mechanism of DNA replication by using the isotopic and Centrifu- gation technique
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

23345.	Question : [A]: Mesozoic era is known as the 'Age of Reptiles'.[R]: It was the era of origin, differentiation and final extinction of dinosaurs which thrived in sea, in air and on land.
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

23346.	Question : a) Mention the major sources of biofertilizers.b) What is biocontrol ? Give any two examples.
Answer» SOLUTION :REFER PAGE No. 230.

Discussion

23347.	Question : A) Mention the chemical linkages between the components of DNA.
Answer» Solution :1) H BOND 2) GLYCOSIDIC bond 3) PHOSPHO diester bond

Discussion

23348.	Question : [A]: Mendelian recombinations are due to crossing over. [R]: Crossing over brings about exchange of genes through chiasma formation.
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

23349.	Question : A membraous small bract different for involucral bracts occurs at the base of each flret of memebers of the family
Answer» asterceae caryophyllaceae bracssicaea PAPILIONACEAE ANSWER :D

Discussion

23350.	Question : A membrane which permits selective movement of molecules through it , is called:
Answer» PERMEABLE membarne UNIT membrane Semipermeable membrane Impermeable membrane Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : A mutant variety of castor produced to bring in early maturity is _____

Question : A mutant strain to T_4-Bacteriophage, R-II, fails to lyse the E.coli but when two strains R-II^x and R-II^y are mixed then they lye the E.coli. What may be the possible reason :

Question : A multinational company outside India tried to sell new varieties of turmeric without proper patent rights. What is such an act referred to

Question : A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has.

Question : A multicelluar, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

Question :A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occursjust after the formation of zygote. The adult filament of the alga has :-

Question : A :MTP become necessary when it is due to rape/of result of rape. R :MTP can be done after 24 to 30 weeks of pregnancy .

Question : A mRNA strand has a series of triplet codons of which the first three codons are given below (a) AUG(b) UUU (c) UGC (i) Name the amino acid encoded by these triplet codons.(ii) Mention the DNA sequence from which these triplet codons would have transcribed?

Question : A mRNA molecule is produced by

Question : A motile colonial form consisting of definite number of cells.

Question : A mother of one year old child wanted to space her second child. Her doctor suggested CuT. Explain its contraceptive actions.

Question : A mother of one year old daughter wanted to space her second child. Her doctor suggested CuT. Explain its contraceptive actions.

Question : A mother of blood groupO has a group O child , the father could be

Question : A mother of a one-year-old daughter wanted to spaceher second child. Suggest the best method for contraceptive actions.

Question : A: More than one pollen tubes can enter an embryo sac R: Double fertization can occur by contributin of gametes from different pollens

Question : A : Montreal protocol suggested the reduction of ODS. R : A land mark international agreement taken in Earth summit held at Rio de Janeiro.

Question : A monopoly granted to a person who as either invented a new and useful article, made improvement in an article or invented a new process of making an article is called

Question : A monohybrid cross between two plants, one having 24 cm long internode and other having 12 cm long internode, produces F_(1) hybrid, all having 18 cm long internodes. This is a case of

Question : A monopoly granted to a person who has either invented a new and useful article, made inprovement in an existing article or invented a new process of making an article is called

Question : A molecule that can act as a genetic material must fulfill the traits given below, except

Question : A monocot root differs from a dicot root by the presence of

Question : A molecule that acts as a genetic material must fulfill the following criteria. except

Question : A mode of sexual reproduction.(A) Conjugation(B) Binary fission(C) Multiple fission(D) Fragmentation

Question : A mixture of heat-killed NL cells (dead cells) and live L-cells is injected into mice.NL- type cells are pathogenic, develop a disease and kill the animals. On the other hand L-type cells are non-pathogenic. The expected result could be

Question : A mixture of fragmented DNA was electrophoresed in an agarose gel. After staining the gel with ethidium bromide, no DNA bands were observed. What could be the reasons?

Question : A mixture DNA fragments A, B, C and D with molecular weights of A + B = C gt B and D gt C was subjected to agarose gel electrophoresis. The position of these fragments from cathode to anode sides of the gel would be

Question : A. mixture electrophoresed in an agarose gel. After staining of fragmented DNA was the gel with ethidium bromide, no DNA bands were observed. What could be the reason ?

Question : A mixturecontainingDNA fragmentsa,b,cand dwith molecularweights of aofa+ b = c,alt band d lt c was subject to agarose gelelectronphoresis. Theposition of thesefragments from cathode toanodesides of the gelworld.

Question : A mink breeder finds that 50 % of the offspring are aa. What genotype were their parents ?

Question : A mineral nutrient will be considered as toxic when-

Question : [A]: Mimics are always or more often defenceless.[R]: Mimics are always less in number than the model individuals

Question : A milch breed of cattle quite common in Punjab. Haryana and Uttar Pradesh is

Question : A microspore mother cell forms(A) embryo sac(B) pollen Grains(C) nucellus(D) tapetum

Question : A microphyllous, heterosporous, pteridophyte belonging to sphenophyta and havingectophloic siphonostele is

Question : A method of sexual reproduction where gamete are exchange through temporary cytoplasmic bridge. (A) Runner (B) Binary fission (C) Sporulation (D) Conjugation

Question : Which one is the method of birth control ?

Question : A method in which roots are induced on the stem branch, while it is still attached to the parent plant, is called

Question : [A]: Metacentric chromosomes are V-shaped [R]: In these chromosomes, the centromere occurs in the centre forming two equal arms.

Question : [A]: Metacentric chromosomes are V- shaped. [R]: In these chromosomes the centromere occurs in the centre and forming two equal arms.

Question : [A]: Meselson and Stahl tested the Watson and Crick Theory of DNA replication. [R]: They confirmed the mechanism of DNA replication by using the isotopic and Centrifu- gation technique

Question : [A]: Mesozoic era is known as the 'Age of Reptiles'.[R]: It was the era of origin, differentiation and final extinction of dinosaurs which thrived in sea, in air and on land.

Question : a) Mention the major sources of biofertilizers.b) What is biocontrol ? Give any two examples.

Question : A) Mention the chemical linkages between the components of DNA.

Question : [A]: Mendelian recombinations are due to crossing over. [R]: Crossing over brings about exchange of genes through chiasma formation.

Question : A membraous small bract different for involucral bracts occurs at the base of each flret of memebers of the family

Question : A membrane which permits selective movement of molecules through it , is called: