24277 + Interview Questions in Biology in Class 12 Page 307 InterviewSolution

15301.	Question : In Spirogyra
Answer» chloroplasts are 32 - 40 vegetative reproduction occur by FRAGMENTATION CONJUGATION forms hypnospores asexual reproduction occurs by zoospores Answer :B

Discussion

15302.	Question : In Spallanzani's experiment, one set of flasks had access to air through holes in the cork and the other set did not . In the set having access to air, the contents showed abundant growth of microorganisms. What inference would you drew form this experiment?
Answer» SPONTANEOUS generation does not need air Spontaneous generation REQUIRES contact with air The CONTENTS of the flask had not been BOILED throughly Spontaneous generation is impossible, if there is no spore source like air Answer :D

Discussion

15303.	Question : In species of maize the proportion of which amino acids has been documented double ?
Answer» TRYPTOPHAN and Metheonin Isolueine and Glysine Luline and TRYPTOPHANE LYSINE and Tryptophane SOLUTION :Lysine and Tryptophane

Discussion

15304.	Question : In spermatogenesis, a primary spermatocyta produce four similar sperms while in oognesis a primary oocyte forms
Answer» Four similar ova. Three LARGE ova and ONE POLAR body Two large ova and two polar BODIES One large ovum and 2-3 polar bodies. ANSWER :D

Discussion

15305.	Question : In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:
Answer» A-DNA B-DNA cDNA rDNA Solution :cDNA In some VIRUSES, DNA is SYNTHESISED by USING RNA as TEMPLATE. Such a DNA is CALLED c-DNA (Complementary DNA).

Discussion

15306.	Question : In some viruses, DNA is synthesised by us- ing RNA as template. Such a DNA is called
Answer» A-DNA B-DNA cDNA rDNA Answer :C

Discussion

15307.	Question : In some species of Asteraceae and grasses, seeds are formed without fusion of gametes. Mention the scientific term for such of reproduction.
Answer» SOLUTION :APOMIXIS

Discussion

15308.	Question : In some viruses , DNA is synthesised by using RNA as template . Such a DNA is called :
Answer» A - DNA B - DNA C DNA rDNA Answer :B

Discussion

15309.	Question : In some shallow South American lakes visiting flamingos and resident fishes compete for their common food,
Answer» PHYTOPLANKTONS ZOOPLANKTONS insects both(A) and (B) ANSWER :B

Discussion

15310.	Question : The persistent nucellus in the seed is calledEndospermPerispermCotyledonsPericarp
Answer» ENDOSPERM Scutellum Plumule Perisperm Answer :D

Discussion

15311.	Question : In some seeds, the nucellus may be persistent. Such nucellus is called
Answer» Endosperm Scutellum Plumule Perisperm Answer :D

Discussion

15312.	Question : In some plants self pollination is prevented by genetic mechanism of either pollen or pistil. Why does such process not lead to seed formation?
Answer» SOLUTION :It is because of INTERACTION between the CHEMICALS of the POLLEN and those of STIGMA ( Pollen-pistil interaction )

Discussion

15313.	Question : In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as :
Answer» (A) PARTHENOCARPY (B) SYNGAMY (C) PARTHENOGENESIS (D) Autogamy Answer :C

Discussion

15314.	Question : In some plants self pollination is prevented by genetic mechanism of either pollen or pistil. Name the process.
Answer» SOLUTION :SELF INCOMPATIBILITY

Discussion

15315.	Question : In someplants particularly halophytesthe seedsgerminate with thefruitswhilestillattachedtothe parent plant.Identifythisphenomenonfrom thefollowingterms
Answer» VERNALIZATION MONOCARPIC VIVIPARY ANSWER :C

Discussion

15316.	Question : In some plants, megaspore mother cell does not divide by meiotic division, instead from an unreduced embryosac, containing diploid egg cell. This condition is referredas
Answer» SPOROPHYTIC budding Polyembryony RECURRENT agamospermy Parthenocarpy Answer :C

Discussion

15317.	Question : In some plants ,floweringis either Quantitatively or Qualitativelydependent on exposure to low temperatureand it is called
Answer» VERNALISATION DORMANCY QUIESCENCE Photoperiodism Answer :A

Discussion

15318.	Question : In some plants anthers and stigma grow and mature at same time. This phenomenon is called:
Answer» Homogamy Syngamy Allogamy Fusion Answer :A

Discussion

15319.	Question : In some plants, anthers and stigma grow and mature at same time. This phenomenon is called:
Answer» HOMOGAMY SYNGAMY ALLOGAMY Fusion Answer :A

Discussion

15320.	Question : In some organisms, karyokinesis is not followed by cytokinesis as e result of which, multinucleate condition arises leading to the formation of syncytium. The perfect example for this is
Answer» APPERANCE of a FURROW in CELL membrane liquid ENDOSPERM in coconut sexual reproduction fertilization Answer :B

Discussion

15321.	Question : In some organisms male and female reproductive organs are seen in the same individual. Name that condition.Give two example of such organisms.
Answer» SOLUTION :HERMAPHRODITE. Eg.Earthworm,LEECH

Discussion

15322.	Question : In some males mammary glands develop the condition called_____.
Answer» ANSWER :GYNAECOMASTIA

Discussion

15323.	Question : In some flowers like Lily (Liliaceae family), the calyx & corolla are not distinct and are termed as :-
Answer» Florets Gamopetalous Perianth Polypetalous Answer :C

Discussion

15324.	Question : In some cases the nucellus persists in the from of a food-storing thin layer called_____.
Answer» ANSWER :PERISPERM

Discussion

15325.	Question : In some cases the sepals are modified into a tuft of hair-like structures called _____
Answer» ANSWER :PAPPUS

Discussion

15326.	Question : In some cases, population density is measured in terms of biomass rather than in terms of number because
Answer» it is a more meaningful measure when the CONSIDERED organisms vary greately in size it is more convenient when population is huge and counting is impossible or very time consuming it is a relatively constatn measure both (a) and (B) Solution :Although the total number is most appropriate measure of population density, but in some cases it is difficult to determine. In a forest area, suppose there are 200 Parthenium plants but only a single huge BANYAN tree with a LARGE canopy. Stating that the population density of banyan is low relative to that of Parthenium, amounts to underestimating the great role of the banyan in that forest community. In such cases, the percent cover or BIOMASS is a more meaningful measure of the population size. if the population is huge and counting is impossible or very time-consuming, the total number is not easily measured. e.g., for a dense laboratory culture of bacteria in a petri dish, only the biomass can be used as a measure of its density.

Discussion

15327.	Question : In some algae ___ are motile
Answer» MALE gametes FEMALE gametes both male and female gametes none of the above Answer :C

Discussion

15328.	Question : In somatic hybridization, plant cells are treated with pectinase and cellulase to
Answer» REMOVE the NUCLEUS from the CELL Dissolve the cell wall Fuse the nucleus of TWO cells Remove the plasma membrane Answer :B

Discussion

15329.	Question : In small population which force of evolution operated by Seth Wright '?
Answer» GENETIC DRIFT GENE fluctuation Gene follow Both (A) and (B) Solution :Both (A) and (B)

Discussion

15330.	Question : In soil water available for plants is ......... .
Answer» GRAVITATIONAL WATER chemically BOUND water CAPILLARY water hygroscopic water Solution :capillary water

Discussion

15331.	Question : In small intestine,acitve absorption occurs in case of
Answer» GLUCOSE AMINO ACIDS `NA^+` All the above ANSWER :D

Discussion

15332.	Question : In sleeping movement in some plants is known as:
Answer» Seismonasty Nyctinasty Photonasty Thermonasty Answer :B

Discussion

15333.	Question : In slime moulds :- (a) The main body is wall less (b) True wall is found around spores (c) Spores are dispersed by water (d) Saprophytes are not common
Answer» a, B are correct a, C are correct b, d are correct a, d correct Answer :A

Discussion

15334.	Question : In skeletal muscles Z-line is crossed by
Answer» Actin Myosin Tropomyosin Henson's line Answer :A

Discussion

15335.	Question : In situ conservation and national genetic resources can be achieved by Establishing
Answer» NATIONAL park Wildlife Sanctuaries Biosphere Reserve All of above Answer :D

Discussion

15336.	Question : In single cell protein, care has to be taken to remove
Answer» EXCESS NUCLEIC acids Fats Heavy metals Both (1) & (3) ANSWER :D

Discussion

15337.	Question : In sigmoid growth curve, the initial stage of slow growth is called
Answer» LOG phase EXPONENTIAL phase LAG phase Stationary phase ANSWER :C

Discussion

15338.	Question : In sickle cell anaemia, the ………………..codon of beta - globin gene is modified.
Answer» Eighth Seventh SIXTH Nineth Solution :Sixth

Discussion

15339.	Question : In sickle cell anaemia, an amino acid substitution is
Answer» VALINE by GLUTAMINE in `ALPHA`- CHAIN Valine by glutamine in `BETA`- chain Glutamine by valine in `alpha`- chain Glutamate by valine in `beta`- chain Answer :D

Discussion

15340.	Question : In sickle cell anaemia, glutmic acid is replaced by valine. Which one of the following triplets codes for valine
Answer» GGG AAG GAA GUG Answer :D

Discussion

15341.	Question : In sickle-cell anaemia Glutamic acid is replaced by Valine. Which one of the following are triplet codes for valine ?
Answer» GGG AAG GAA GUG Solution :The substitution of AMINO acid inin the 6TH position of the ? chain of globin PROTEIN results due to the single base substitution at the sixth codon of the betaglobin gene from GAG (Glutamic acid) to GUG (Valine).

Discussion

15342.	Question : In shade loving plantstheirlight compensation pointis reached at lowirradiance because
Answer» leaveshave more chlorophyll these plannts havegreatlyreducedrespirationrates shade PLANTIS capable of MUCH lower rates of photosytheisi than sunplants shade LOVING plants syntesized pigments such as ANTHOCYANINS to PROMOTE photosynthesis Answer :A

Discussion

15343.	Question : In sexually reproducing organisms during reproduction, male gametes are produced in large numbers. Why?
Answer» Solution :In almost all organisms, the female gamete is stationary and male gametes are mobile. The male gametes MUST travel through a medium to reach the female gametes. HOWEVER, most of them fail to reach the female gametes. To compensate this loss of male gametes during transport, the number of male gametes produced is SEVERAL thousand times the number of female gametes.

Discussion

15344.	Question :In September 2001, which of the following was used as a bioweapon agent in America
Answer» Botulinum Anthrax (BACILLUS anthracis) POLIO VIRUS AIDS virus Answer :B

Discussion

15345.	Question :In September 2001, which of the following was used as a bioweapon agent in America?
Answer» Botulinum Anthrax (BACILLUS ANTHRACIS) Polio virus AIDS virus ANSWER :B

Discussion

15346.	Question : Write the advantages and disadvantages of self-pollination.
Answer» ANSWER :TRUE

Discussion

15347.	Question : In seed perisperm is
Answer» MODIFIED integument Consumed NUCELLUS after fertilization Persistent nucellus Modified endosperm Answer :A

Discussion

15348.	Question :In secondary treatment of sewage in open bioreactors , the microorganisms grow and multiply to form ______________
Answer» MANURE COMPOST SLUDGE sediment Answer :C

Discussion

15349.	Question : In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the three bases expected to be present in this DNA are:
Answer» G 34%, A 24.5%, T 24.5% G 17%, A 16.5%, T 32.5% G 17%, A 33%, T 33% G 8.5%, A 50%, T 24.5% SOLUTION :G 17%, A 33%, T 33%

Discussion

15350.	Question :In sea urchin DNA , which is double stranded , 17 of the bases were shown to be cytosine . The percentages of other three bases expected to be present in this DNA are :
Answer» `G=8.5%, A=50%, T=24.5%` `G=34%, A=24.5%, T=24.5%` `G=17%, A=16.5%, T=32.5%` `G=17%, A=33%, T=33%` ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : In Spirogyra

Question : In Spallanzani's experiment, one set of flasks had access to air through holes in the cork and the other set did not . In the set having access to air, the contents showed abundant growth of microorganisms. What inference would you drew form this experiment?

Question : In species of maize the proportion of which amino acids has been documented double ?

Question : In spermatogenesis, a primary spermatocyta produce four similar sperms while in oognesis a primary oocyte forms

Question : In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:

Question : In some viruses, DNA is synthesised by us- ing RNA as template. Such a DNA is called

Question : In some species of Asteraceae and grasses, seeds are formed without fusion of gametes. Mention the scientific term for such of reproduction.

Question : In some viruses , DNA is synthesised by using RNA as template . Such a DNA is called :

Question : In some shallow South American lakes visiting flamingos and resident fishes compete for their common food,

Question : The persistent nucellus in the seed is calledEndospermPerispermCotyledonsPericarp

Question : In some seeds, the nucellus may be persistent. Such nucellus is called

Question : In some plants self pollination is prevented by genetic mechanism of either pollen or pistil. Why does such process not lead to seed formation?

Question : In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as :

Question : In some plants self pollination is prevented by genetic mechanism of either pollen or pistil. Name the process.

Question : In someplants particularly halophytesthe seedsgerminate with thefruitswhilestillattachedtothe parent plant.Identifythisphenomenonfrom thefollowingterms

Question : In some plants, megaspore mother cell does not divide by meiotic division, instead from an unreduced embryosac, containing diploid egg cell. This condition is referredas

Question : In some plants ,floweringis either Quantitatively or Qualitativelydependent on exposure to low temperatureand it is called

Question : In some plants anthers and stigma grow and mature at same time. This phenomenon is called:

Question : In some plants, anthers and stigma grow and mature at same time. This phenomenon is called:

Question : In some organisms, karyokinesis is not followed by cytokinesis as e result of which, multinucleate condition arises leading to the formation of syncytium. The perfect example for this is

Question : In some organisms male and female reproductive organs are seen in the same individual. Name that condition.Give two example of such organisms.

Question : In some males mammary glands develop the condition called_____.

Question : In some flowers like Lily (Liliaceae family), the calyx & corolla are not distinct and are termed as :-

Question : In some cases the nucellus persists in the from of a food-storing thin layer called_____.

Question : In some cases the sepals are modified into a tuft of hair-like structures called _____

Question : In some cases, population density is measured in terms of biomass rather than in terms of number because

Question : In some algae ___ are motile

Question : In somatic hybridization, plant cells are treated with pectinase and cellulase to

Question : In small population which force of evolution operated by Seth Wright '?

Question : In soil water available for plants is ......... .

Question : In small intestine,acitve absorption occurs in case of

Question : In sleeping movement in some plants is known as:

Question : In slime moulds :- (a) The main body is wall less (b) True wall is found around spores (c) Spores are dispersed by water (d) Saprophytes are not common

Question : In skeletal muscles Z-line is crossed by

Question : In situ conservation and national genetic resources can be achieved by Establishing

Question : In single cell protein, care has to be taken to remove

Question : In sigmoid growth curve, the initial stage of slow growth is called

Question : In sickle cell anaemia, the ………………..codon of beta - globin gene is modified.

Question : In sickle cell anaemia, an amino acid substitution is

Question : In sickle cell anaemia, glutmic acid is replaced by valine. Which one of the following triplets codes for valine

Question : In sickle-cell anaemia Glutamic acid is replaced by Valine. Which one of the following are triplet codes for valine ?

Question : In shade loving plantstheirlight compensation pointis reached at lowirradiance because

Question : In sexually reproducing organisms during reproduction, male gametes are produced in large numbers. Why?

Question :In September 2001, which of the following was used as a bioweapon agent in America

Question :In September 2001, which of the following was used as a bioweapon agent in America?

Question : Write the advantages and disadvantages of self-pollination.

Question : In seed perisperm is

Question :In secondary treatment of sewage in open bioreactors , the microorganisms grow and multiply to form ______________

Question : In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the three bases expected to be present in this DNA are:

Question :In sea urchin DNA , which is double stranded , 17 of the bases were shown to be cytosine . The percentages of other three bases expected to be present in this DNA are :