24277 + Interview Questions in Biology in Class 12 Page 471 InterviewSolution

23501.	Question : A healthy person eats the following diet-5 gm raw sugar, 4 gm albumin 10gm pure buffalo ghee adulterated with 2 gm vegetable ghee (hydro-genated vegetable oil) and 5 gm lignin. How many calories he is likely to get?
Answer» 126 164 112 144 Answer :D

Discussion

23502.	Question : A healthy forest ecosystem A. Purify air and water B. Mitigate droughts and floods cycle nutrients C. Cycle nutrients D. Generate fertile soil E. Provide wildlife habitat F. Maintain biodiversity G. Pollinate crops H. Provide storage site for carbon I. Provide aesthetic, cultural and spiritual values.
Answer» B, D, E, F, H, I A, B, C, E, G, I A, B,C, D, E, F, G All Solution :All

Discussion

23503.	Question : A -Head of the sperm consists of acrosome and mitochondria. R -Acrosome contains spiral rows of mitochondria.
Answer» A and R are TRUE, R is the CORRECT explanation of A A and R are true, R is not the correct explanation of A A is true, R is false Both A and R are false Solution :Both A and R are false

Discussion

23504.	Question : (A) have haploid plant body.(A) A = Monera, fungi, gymnosperm and angiosperms(B) A = Algae, bryophyta, pteridophyta and gymnosperm(C) A = Monera, fungi, algae and bryophyta(D) A = Pteridophyta, gymnosperm and angiosperms.
Answer» A = Monera, fungi, GYMNOSPERM and angiosperms A = Algae, bryophyta, PTERIDOPHYTA and gymnosperm A = Monera, fungi, algae and bryophyta A = Pteridophyta, gymnosperm and angiosperms. Answer :C

Discussion

23505.	Question : A haploid parent produces gametes by . . . . . . A. . . . .division while diploid parent produces gametes by . . . . . . B . . . . Division.
Answer» a-mitotic, b-meiotic a-meiotic, b-mitotic a-amitotic, b-meiotic a-meiotic,b-amitotic. Answer :A

Discussion

23506.	Question : [A]: Hanstein's dermatogen is not eqyivalent to Haberlandt's Protoderm. [R]: Histogen theory has been proposed by Schemidt
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 :C

Discussion

23507.	Question : A haploid parent produces gametes by(A) meiotic division(B) mitotic division(C) first mitotic and then meiotic(D) first meiotic and then mitotic
Answer» meiotic DIVISION MITOTIC division first mitotic and then meiotic first meiotic and then mitotic ANSWER :B

Discussion

23508.	Question : [A]: Hair cells on the basilar membrane (the organ of corti) are responsible for hearing. [R]: Pressure waves, which begin at the ovaI window, cause the basilar membrane, to vi- brate so that the cilia of the hair cells touch the tectorial membrane. This causes the hair cells to initiate nerve impulses, which are carried by the auditory nerve to the brain.
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

23509.	Question : [A] :Hair cells on the basiiar membrane are responsible for hearing. [R]: Pressure waves which begin at the oval window, cause the basilar membrane to vi- brate so that the ciliaxof the hair celis touch the tectorial membrane. This causes hair cells to initiate nerve impulses
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

23510.	Question : [A]: Haemophillia is a genetically linked dis- ease. [R]: The carrier gene is present on X chromo- some of female
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

23511.	Question : A haemophilic man marries a normal homozygous woman. What is he probability that their son will be haemophilic ?
Answer» `75 %` `50 %` `25 %` `0 %` ANSWER :D

Discussion

23512.	Question : A haemophilia man marries a carrier woman. Their children will be :
Answer» All haemophiliac One-fourth haemophiliac Half haemophiliac One-tenth haemophiliac Answer :C

Discussion

23513.	Question : A habitat with long severe winter and growing season of a few months of Summer forms
Answer» Grasslands Tundra Taiga Savannah Answer :B

Discussion

23514.	Question : A gymnast is able to balance his body upside down even in the total darkness becuase of :
Answer» Organ of corti COCHLEA VESTIBULAR APPARATUS Tectorial membrane Answer :C

Discussion

23515.	Question : A: Growth of male gametophyle is completed over the female reprofuctive organ R: 2- celled stage of partial male gametophyte is developed in situ
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

23516.	Question : A grwoth inhibitorresponsibleforstomatalclosureis
Answer» ZEATIN Abscisic acid Ethylene `GA_(3)` Answer :B

Discussion

23517.	Question : A group of three cells situated at the base of the embryo sac are called ……… cell.
Answer» tube generative synergid antipodal Answer :D

Discussion

23518.	Question : A group of several species of plants and animals living together with mutual adjustment and beneficial interactions.
Answer» ANSWER :COMMUNITY

Discussion

23519.	Question : A group of individuals belonging to same species constitute a :
Answer» ECOSYSTEM POPULATION Commensalism Genus Answer :B

Discussion

23520.	Question : ___is a group of organisms of same species living in a particular area.
Answer» ANSWER :POPULATION

Discussion

23521.	Question : A group of animals which are related by descent and share many similarities are referred to as
Answer» Breed Race Variety Species Solution :A group of animals which are related by descent and share many SIMILARITIES are referred to as breed. Race is a group of people thought to share certain distinctive physical characteristics, such as FACIAL STRUCTURE or skin color. Racial characteristics are thought to be biologically inherited (unlike ethnic characteristics, which are cultural). Variety is a rank below species and its members differs from others in very few characters which are permanent and heritable. Species is a group of INDIVIDUALS with MAXIMUM similarities and which can breed among themselves.

Discussion

23522.	Question : Group of chemical signals act like hormones by coordinating between individuals of same species.
Answer» ANSWER :PHEROMONES

Discussion

23523.	Question : A group of animals related by descent and similar in most characters are said to belong to a breed. Many breeds are produced by inbreeding and outbreeding, Briefly explain the two terms
Answer» SOLUTION :Inbreeding refers to mating of more CLOSELY related individuals withinthe same brced for 4-6generations. STRATEGIES for Enhancement in Food Production Outbreeding is the breeding of unrelated animals which may be between individuals of the same breed but having no common ancestors for 4-6 generations (out crossing) or between different breeds (cross breeding) or different SPECIES (interspecific HYBRIDISATION).

Discussion

23524.	Question : A graph on species richness is given below. Complete the equations (a) and (b) according to Alaxander von Humboldt.
Answer» Solution :a. Log S = log C + Z log A B. `S=CA^(Z)` S - SPECIES RICHNESS, A - Area, Z - Slope of the LINE (regression COEFFICIENT), C = Y intercept

Discussion

23525.	Question : A good vector must have
Answer» ability to replicate anutonomously SINGLE sites for a large number of restriction enzymes easy transformation to the host cells HIGH molecular weight for enhanced STABILITY ANSWER :A

Discussion

23526.	Question : "A good germ plasm collection is essential for the successful breeding programme of crop". This is a message given by an agricultural officer to the farmers of a village. a. What do you mean by germ plasm? b. What is the significance of a germ plasm in a successful breeding programme? c. Cite any three types of plant materials included in the germ plasm.
Answer» Solution :a. The sum total of all the alleles of the GENES PRESENT in a crop of RELATED species is called germ plasm. b. Germ plasm contains valuable aileles of genes that are important in breeding. c. i.Cultivated improved VARIETIES ii. .Lines PRODUCED by plant breeders. iii. Wild species related to the crop species.

Discussion

23527.	Question : A good producer of citric acid is ______________
Answer» SPIRULINA ASPERGILLUS SACCHAROMYCES Clostridium Answer :B

Discussion

23528.	Question : A good cloning vect or should ha ve all except :-
Answer» ORIGIN of replication to START replication Many recognition sites for SINGLE restriction enzyme High COPY number Selectable marker Answer :B

Discussion

23529.	Question : [A]: Glycolysis occurs in the cytoplasm and converts some of the energy stored in glu- cose to ATP and NADH. [R]: Glucose, in glycolysis is splitted into two molecules of 3-C compound.
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

23530.	Question : A glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings in order to prepare a prototype of space colony is
Answer» glass HOUSE PHYTOTRON Biosphere 1 Biosphere 2 Answer :D

Discussion

23531.	Question : (a) Give reason for - (i) Both strands of DNA are not copied during transcription. (ii) Transcription and translation in bacteria can be coupled. (b) Differentiate between the process of transcription in prokaryotes and eukaryotes
Answer» Solution :(a)(i)If both strands act as a template, they would code for RNA molecule with different sequence in turn, they code for proteins. the sequence of amino ACIDS in the proteins would be different. One segment of the DNA would be coding for two different proteins, and this would complicate the genetic information transfer machinery. Second, the two RNA molecules if produced simultaneously would be complementary to each other. Hence would form a double stranded RNA. This would prevent RNA from being translated into protein and the exercise of transcription would become a fertile one. (ii)Transcription and translation take PLACE in the same compartment since there is no separation of cytosol and nucleus in bacteria (b) There is a single DNA dependent RNA polymerase that catalyses transcription of all TYPES of RNA in bacteria, but in EUKARYOTES the RNA polymerase I transcribes RRNA, RNA polymerase III for transcription of RNA and RNA polymerase II transcribes precursor of MRNA The primary transcripts contain both exons and introns and it is subjected to a process called splicing. Also hnRNA undergo two additional processing called as capping and tailing

Discussion

23532.	Question : A give dicot family consists of several genera which are
Answer» Only `C_3` PLANTS Only `C_4` plants `C_3` (or ) `C_4` plants `C_3` & `C_4` plants ANSWER :C

Discussion

23533.	Question : (a) Give an detailed account on various natural methods of contraception.
Answer» Solution :Natural method is used to prevent meeting of sperm with ovum. i.e., Rhythm method (safe period), coitus interruptus, continuous abstinence and lactational amenorrhoea. a. Periodic abstinence/rhythm method: Ovulation occurs at about the 14th day of the menstrual cycle. Ovum survives for about two days and sperm remains alive for about 72 hours in the female reproductive tract. Coitus is to be avoided during this time. b. Continuous abstinence is the simplest and most reliable way to avoid pregnancy is not to have coitus for a defined period that FACILITATES conception. c. Coitus interruptus is the oldest family planning method. The male partner withdraws his penis before ejaculation, THEREBY preventing deposition of semen into the vagina. d Lactational amenorrhoea : Menstrual cycles resume as early as 6 to 8 weeks from parturition. HOWEVER, the reappearance of normal OVARIAN cyclesmaybedelayed forsix months during breast-feeding. This delay in ovarian cycles is called lactational amenorrhoca. It serves as a natural, but an UNRELIABLE form of birth control. Suckling by the baby during breast-feeding stimulates the pituitary to secrete increased prolactin hormone in order to increase milk production. This high prolactin concentration in the mother.s blood may prevent menstrual cycle by suppressing the release of GnRH (Gonadotropin Releasing Hormone) from hypothalamus and gonadotropin secretion from the pituitary.

Discussion

23534.	Question : A girdled tree (upto bast) may survive for some time but it will eventually die because:
Answer» WATER will not MOVE upwards Water will not move upwards Sugars and other ORGANIC MATERIALS will not move downwards Sugars and other organic materials will not move upwards Answer :C

Discussion

23535.	Question : A giant spadix is formed in a species fo
Answer» colacsia CALADIUM amorphosphallus POTHOS ANSWER :D

Discussion

23536.	Question : A genticist intersted in studing variations and patterns of inheritance in living being prefers to choose organisms for experiments with shorter life cycel Provide a reason.
Answer» Solution :A geneticist interested in studying variations and patterns of inheritance in living BEINGS prefers to choose organisms with short LIFE cycles for EXPERIMENTS because it ENABLES the geneticist to study MANY generations of those organisn1s in their short life spans

Discussion

23537.	Question : A giant lyososome that helps in penetrationof sperms into egg is_____
Answer» Cathepsin-D Primary lyososome Acrosome Ambilysosome Answer :C

Discussion

23538.	Question :A genetically engineered microorganism used successfully in bioremediation of oil spills is a species of
Answer» XANTHOMONAS BACILLUS Pseudomonas Trichoderma ANSWER :C

Discussion

23539.	Question : [A]: Genetic engineering is the use of tech- nology to alter the genome of living cell for medical or industrial .use. [R]: Biotechnology gave rise to an industry that provides products made by genetic engi- neering of bacteria.
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

23540.	Question : A genetically engineered micro-roganism used successfully in bioremediation of oit spills is a species of :
Answer» Trichoderma Xanthomonas Bacillus Pseudomonas Answer :D

Discussion

23541.	Question : A genetic trait with fitness of more than one will
Answer» REMAIN INSIGNIFICANT in a population Spread RAPIDLY in a population Spread SLOWLY in population Get eliminated. Solution :N//A

Discussion

23542.	Question : A genetic trait with fitnessof less that will
Answer» Get eliminated ultimately Remain in POPULATION in SMALL proportion Spread SLOWLY in popoluation Replace the NORMAL allele. Solution :N//A

Discussion

23543.	Question : [A]: Genetic engineering is the use of tech- nology to alter the genome of a cell for the benefit of we people. [R]: Here foreign gene is inserted into the cell to get desirable product
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

23544.	Question : [A]: Genetic disorder, sickle cell anaemia is common in new born babies·[R]: It is caused by heterozygosity for allble Hbc, producing a single ammo acid substitu tion in the a-chain of the Haemoglobin deter- mined by allele Hb^A
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 :C

Discussion

23545.	Question : A genetic disorder caused due to non - disjuction of sex chromosome is
Answer» Down's syndrome Cysticfibrosis Sickle CELL anaemia Kilnetelter's syndrome Solution :DOMESTICATED fowls show FEMALE heterogamety In domesticated fowls, sex of PROGENY depends upon the type of EGG rather than type of sperm

Discussion

23546.	Question : A genetic disorder can be cured through
Answer» RDNA technology embryo transfer gene THERAPY all of these Solution :Gene therapy is a collection of methods, that allows correction of a gene DEFECT that has been diagonsed in a CHILD embryo.

Discussion

23547.	Question : [A]: Genes confined to differential region of homologous chromosomes are called holandric genes. [R]: Genes confined to homologous region of Y chromosomes only are celled Holandric genes.
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 :D

Discussion

23548.	Question : A gene, whose expression helps to identify transformed cells is known as
Answer» selectable MARKER vector plasmid STRUCTURAL gene Solution :selectable marker

Discussion

23549.	Question : A gene which hides the action of another gene is termed as
Answer» Co-dominant gene Epistatic gee Hypostatic gene Lethal gene Answer :B

Discussion

23550.	Question :A gene that masks another gene's expression is called
Answer» Dominant RECESSIVE Epistatic ASSORTED Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : A healthy person eats the following diet-5 gm raw sugar, 4 gm albumin 10gm pure buffalo ghee adulterated with 2 gm vegetable ghee (hydro-genated vegetable oil) and 5 gm lignin. How many calories he is likely to get?

Question : A -Head of the sperm consists of acrosome and mitochondria. R -Acrosome contains spiral rows of mitochondria.

Question : (A) have haploid plant body.(A) A = Monera, fungi, gymnosperm and angiosperms(B) A = Algae, bryophyta, pteridophyta and gymnosperm(C) A = Monera, fungi, algae and bryophyta(D) A = Pteridophyta, gymnosperm and angiosperms.

Question : A haploid parent produces gametes by . . . . . . A. . . . .division while diploid parent produces gametes by . . . . . . B . . . . Division.

Question : [A]: Hanstein's dermatogen is not eqyivalent to Haberlandt's Protoderm. [R]: Histogen theory has been proposed by Schemidt

Question : A haploid parent produces gametes by(A) meiotic division(B) mitotic division(C) first mitotic and then meiotic(D) first meiotic and then mitotic

Question : [A] :Hair cells on the basiiar membrane are responsible for hearing. [R]: Pressure waves which begin at the oval window, cause the basilar membrane to vi- brate so that the ciliaxof the hair celis touch the tectorial membrane. This causes hair cells to initiate nerve impulses

Question : [A]: Haemophillia is a genetically linked dis- ease. [R]: The carrier gene is present on X chromo- some of female

Question : A haemophilic man marries a normal homozygous woman. What is he probability that their son will be haemophilic ?

Question : A haemophilia man marries a carrier woman. Their children will be :

Question : A habitat with long severe winter and growing season of a few months of Summer forms

Question : A gymnast is able to balance his body upside down even in the total darkness becuase of :

Question : A: Growth of male gametophyle is completed over the female reprofuctive organ R: 2- celled stage of partial male gametophyte is developed in situ

Question : A grwoth inhibitorresponsibleforstomatalclosureis

Question : A group of three cells situated at the base of the embryo sac are called ……… cell.

Question : A group of several species of plants and animals living together with mutual adjustment and beneficial interactions.

Question : A group of individuals belonging to same species constitute a :

Question : ___is a group of organisms of same species living in a particular area.

Question : A group of animals which are related by descent and share many similarities are referred to as

Question : Group of chemical signals act like hormones by coordinating between individuals of same species.

Question : A group of animals related by descent and similar in most characters are said to belong to a breed. Many breeds are produced by inbreeding and outbreeding, Briefly explain the two terms

Question : A graph on species richness is given below. Complete the equations (a) and (b) according to Alaxander von Humboldt.

Question : A good vector must have

Question : A good producer of citric acid is ______________

Question : A good cloning vect or should ha ve all except :-

Question : [A]: Glycolysis occurs in the cytoplasm and converts some of the energy stored in glu- cose to ATP and NADH. [R]: Glucose, in glycolysis is splitted into two molecules of 3-C compound.

Question : A glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings in order to prepare a prototype of space colony is

Question : (a) Give reason for - (i) Both strands of DNA are not copied during transcription. (ii) Transcription and translation in bacteria can be coupled. (b) Differentiate between the process of transcription in prokaryotes and eukaryotes

Question : A give dicot family consists of several genera which are

Question : (a) Give an detailed account on various natural methods of contraception.

Question : A girdled tree (upto bast) may survive for some time but it will eventually die because:

Question : A giant spadix is formed in a species fo

Question : A genticist intersted in studing variations and patterns of inheritance in living being prefers to choose organisms for experiments with shorter life cycel Provide a reason.

Question : A giant lyososome that helps in penetrationof sperms into egg is_____

Question :A genetically engineered microorganism used successfully in bioremediation of oil spills is a species of

Question : [A]: Genetic engineering is the use of tech- nology to alter the genome of living cell for medical or industrial .use. [R]: Biotechnology gave rise to an industry that provides products made by genetic engi- neering of bacteria.

Question : A genetically engineered micro-roganism used successfully in bioremediation of oit spills is a species of :

Question : A genetic trait with fitness of more than one will

Question : A genetic trait with fitnessof less that will

Question : [A]: Genetic engineering is the use of tech- nology to alter the genome of a cell for the benefit of we people. [R]: Here foreign gene is inserted into the cell to get desirable product

Question : [A]: Genetic disorder, sickle cell anaemia is common in new born babies·[R]: It is caused by heterozygosity for allble Hbc, producing a single ammo acid substitu tion in the a-chain of the Haemoglobin deter- mined by allele Hb^A

Question : A genetic disorder caused due to non - disjuction of sex chromosome is

Question : A genetic disorder can be cured through

Question : [A]: Genes confined to differential region of homologous chromosomes are called holandric genes. [R]: Genes confined to homologous region of Y chromosomes only are celled Holandric genes.

Question : A gene, whose expression helps to identify transformed cells is known as

Question : A gene which hides the action of another gene is termed as

Question :A gene that masks another gene's expression is called