24277 + Interview Questions in Biology in Class 12 Page 83 InterviewSolution

4101.	Question : Thermoregulatory centre in brain of man is
Answer» pituitary diencephalon hypothalamus none of these Answer :C

Discussion

4102.	Question :Thermal powerplants are inevitablein anindustrialanddenselypopulated country likeour -whatharmthey do to the environment ? Alsomention any precaution that could be takento save our environment.
Answer» SOLUTION :Hot effluentsof THERMAL POWER plantsare generallyreleasedin thenearbywater bodies This causesrise in temperature of suchwaterbodieswhichcauses deoxygenationof waterleadingto decom-positionof organicwastesand killingof aquatic ani-mals .Thermal water pollutioncan be CHECKED by employing dry or wetcollingtowers .

Discussion

4103.	Question : Thermal power plants are inevitable in an industrialand densely populated country like ours what harm do they do the environment ?Also mention any precaution that could be taken to save our environment .
Answer» Solution :The release particulate and GASEOUS AIR pollutants ,hot thermal waste kills organism sensitive to high temperature ,INDIGENOUS flora ad fauna lose USE of electrostatic precipitator

Discussion

4104.	Question : Thermal pollution is harmful for aquatic animals.
Answer» SOLUTION :Warm WATER holds less dissolved oxygen than COLD water. The fishes and other organisms are killed because of abrupt change in temperalule. It is called as THERMAL shock. It also increases metabulic rate due to increased enzymatic rate. Increased temperature can cause anaerobic CONDITIONS in deep waters which increases bacterial population.

Discussion

4105.	Question : There was great excitement around the world when the sheep 'Dolly' was cloned using a nucleus derived from an adult cell of its 'mother' which was them transplanted into an enucleated egg. There is also excitement when it is announced that genes causing human diseases, like muscular dystrophy, have been cloned. Which statement about these two examples of cloning is correct ?
Answer» They both INVOLVE cutting a piece of DNA from the genome One involves the cloning of a nucleus and the other is the cloning of a piece of DNA They both produce products genetically IDENTICAL to the original donor of cellular material They raise no ETHICAL questions Solution :The sheep 'Dolly' was produced by transferring entire nucleus into an encleated cell white cloning of genes like genes of muscular dystrophy involves cutting the DNA piece containing the particular gene and transferring its through a vector or through other methods into a host cells. Tools of recombinant DNA technology like restriction ENZYMES, etc. are not used in first experiment while they are essential for the second. In the first experiment,cell express all the genes of the donor while cells in the second experiment, express only the desirable gene that is transferred.

Discussion

4106.	Question : There was no degradation of any organic compounds arising in primitive earth because
Answer» ATMOSPHERE was ABSENT Atmosphere was HIGHLY reducing Atmosphere was highly oxidising None of the above ANSWER :A

Discussion

4107.	Question : Thermal cycle takes place in which technique
Answer» GEL ELECTROPHORESIS PCR- TECHNIQUE Centrifugation Southern blotting Solution :PCR- technique

Discussion

4108.	Question : Thermal cycle is used in
Answer» Radioactivation CHEMICAL reaction Polymerase chain reaction Enzyme CATALYSED REACTIONS Solution :Polymerase chain reaction

Discussion

4109.	Question : There was an article published in a -newspaper on DNA fingerprinting revealing procedure and its applications. Following terms were mentioned in this article : (i) Minisatellite (ii) Microsatellite Briefly mention about these terms.
Answer» Solution :(i) Minisatellites have sequences of approximately 15 to 50 base PAIRS and repeated tandemly upto thousands of times. There are about 30,000 minisatellites loci in the human genome. (ii) Microsatellites have base pairs of less than 10 and repeated usually 10 to 100 times. In himan genome, there are about 2,00,000 such satellite loci. These simple tandem REPEATS of short sequences are called VNTRS (variable NUMBER Tandem repeats).

Discussion

4110.	Question : Therewas a cultural evolution ratherthanstrcuturalevolution after .
Answer» HOMO erectus stage Cro- MAGNON stage Australopithecus stage Neaderthal man stage . ANSWER :B

Discussion

4111.	Question : There is shift in the policy of animal collection in the zoo from unlimited animals and limited facilities' to 'limited animals and adequate facilities'. Give reason.
Answer» Solution :Zoos were considered as picnic spots in the PAST. Now, they are managed as conservation and education centres where captive breeding of RARE and endangered animals is undertaken and more and more information on wildlife conservation and management is GENERATED through scientific research. ACCORDINGLY, there is a shift in the policy of animal collection in the ZOO from .unlimited animals and limited facilities. to .limited animals and adequate facilities..

Discussion

4112.	Question : There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena.
Answer» Solution :Some amino acids are CODED by more than one codon (KNOWN as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained. For EXAMPLE, lie has three codons : AUU, AUC AUA hence a depeptide. Met-lle can have the following nucleotide sequence: (i) AUG-AUU (ii) AUG-AUC (iii) AUG-AUA - And if, we deduce amino acid sequence the above nucleotide sequences, all the three will code for Met-lle

Discussion

4113.	Question : There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotide sequences can be deduced from a single amino acid sequence. Explain this phenomenon.
Answer» Solution : Some AMINO acids are CODED by more than one codon (known as degeneracy of codons), hence on deducing a NUCLEOTIDE sequence from an amino acid sequence, multiple nucleotide sequence will be obtained. For e.g., Ile has three codons: AUU, AUC AUA hence a DIPEPTIDE Met-Ile can have the following nucleotide sequence : (i) AUG - AUU (ii) AUG - AUC (III) AUG - AUA If we deduce amino acid sequence for the above nucleotide sequences, all the three will code forMet-Iie

Discussion

4114.	Question : There is no sugar in the urine. The blood entering the kidney has more sugar than the blood leaving the kidney. because -
Answer» sugar is used by kidney CELLS in their metabolism sugar is reabsorbed by PCT sugar is reabsorbed by URINARY bladder Sugar is ABSORBED by DCT Answer :A

Discussion

4115.	Question : There is no natural death in single celled organisms like Amoeba and bacteria because : (A) They cannot reproduce sexually(B) They reproduce by binary fission(C) Parental body is distributed among the offspring(D) They are microscopic
Answer» They cannot reproduce sexually They reproduce by binary fission PARENTAL body is distributed among the OFFSPRING They are microscopic Answer :C

Discussion

4116.	Question : There is no division of cytoplasm after mitosis then the condition will be:
Answer» One CELL one nuclei one cell with TWO nuclei only one cell one cell WITHOUT nucleus Answer :B

Discussion

4117.	Question : There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
Answer» Solution :Speciation is generally a function of TIME, UNLIKE temperate regions subjected to frequent glaciations in the past, tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long EVOLUTIONARY time for species diversification. Tropical environments, unlike temperate ONES are less seasonal, relatively more constant and predictable. Such constant environments PROMOTE niche specialisation and lead to a greater species diversity. There is more solar energy available in the tropics, which contributes to higher productivity, this in turn might contribute indirectly to greater diversity.

Discussion

4118.	Question : There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. Why? What are its adverse effects ?
Answer» Solution :FOLLOWING discharge of sewage into river, microorganisms involved in biodegradation of organic matter PRESENT in sewage consume more oxygen. This CAUSE mortality of fish and other AQUATIC creatures.

Discussion

4119.	Question : There is greater biodiversity in the tropical regions of the world.
Answer» Solution :The REASONS for GREATER biodiversity in the tropical regions of the world is because UNLIKE temperate regions which have been subjected to frequent glaciation in the park, tropical latitudes have remained relatively undistributed for millions of years and THUS had long evolutionary time for species diversification. Tropical environments, unlike temperate ones are less SEASONAL, relatively more constant and predictable such constant environment promote niche specialization and lead to a greater species diversity. There is more solar energy available in the tropical region, which induces higher productivity and thus greater diversity.

Discussion

4120.	Question : There is a restriction endonuclease called EcoRI. What does 'co' part in it stand for ?
Answer» COLON coelom coenzyme COLI SOLUTION :coli

Discussion

4121.	Question : There is a type of conservation of genetic resources through their maintenance within natural or man made ecosystem. a. Which type of conservation is this? b. Give the importance of the protected areas and the divisions involved in this.
Answer» Solution :a. In-situ conservation b. The areas of land or SEA which are meant for the protection and maintenance of biodiversity, natural resources etc. Divisions - National PARKS, Sanctuaries, BIOSPHERE RESERVES, Cultural landscapes, Natural MONUMENTS etc.

Discussion

4122.	Question : There is a restriction endonuclease called Eco RI. What does 'co' part in it stand for ?
Answer» COLON COELOM COENZYME Coenzyme ANSWER :D

Discussion

4123.	Question : There is a restriction endonuclease called EcoRI. What does "co" part in it stand for ?
Answer» Coli Coelom Coenzyme Colon Answer :A

Discussion

4124.	Question : There is a restriction endonuclease called EcoR l . What does "co" part in it stand for?
Answer» COLI COLON COELOM COENZYME ANSWER :A

Discussion

4125.	Question : 'There is a paternity dispute for a child'. Which technique can solve the problem. Discuss the principle involved.
Answer» Solution :DNA finger printing is used to solve the paternity dispute. DNA fingerprinting involves identifying differences in some specific REGIONS sequence called as repetitive DNA, because in these sequences, a small stretch of DNA is repeated many times. These repetitive DNA are separated from bulk genomic DNA as different peaks during density gradient centrifugation. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. Depending on base composition (A : T rich or G :C rich), length of segment, and number of repetitive units, the satellite DNA is classified into many categories, such as MICRO- satellites, mini-satellites etc. These sequences normally do not code for any proteins, but they form a large portion of human genome. These sequence show high degree of polymorphism and form the basis of DNA fingerprinting. Since DNA from every tissue (such as blood, hair- follicle, skin, bone, saliva, sperm etc.), from an individual show the same degree of polymorphism, they become very useful identification tool in forensic applications. Further, as the polymorphisms are inheritable from parents to children, DNA fingerprinting is the basis of paternity testing, in case of disputes. The technique of DNA fingerprinting was initially developed by Alec Jeffreys. Lalji Singh is called father of Indian DNA fingerprinting or DNA profiling or DNA typing. He used a satellite DNA as probe that shows very high degree of polymorphism. It was called as Variable Number of Tandem Repeats (VNTR). The technique, as used earlier, involved Southern BLOT hybridisation using radiolabelled VNTR as a probe. It included (i) Isolation of DNA, (ii) Digestion of DNA by 8 restriction endonucleases, (iii) Separation of DNA fragments by ELECTROPHORESIS, (iv) Transferring (blotting) of separated DNA fragments to synthetic membranes, such as nitrocellulose or nylon, (v) Hybridisation using labelled VNTR probe, and (vi) Detectionof hybridised DNA fragments by autoradiography.

Discussion

4126.	Question : There is a narrow range of concentration at which the elements are optimum. This statement is concerned with :-
Answer» TRACER elements Small SIZED elements Micronutrients Balancing elements Answer :C

Discussion

4127.	Question : There is a large diversity in the biological world and each organism has evolved its own mechanism to multiply and produce offspring. The method of reproduction depends upon
Answer» HABITAT of organism Internal PHYSIOLOGY of organism Will power Both A and B. Answer :D

Discussion

4128.	Question : There isa balancebetween productionand degenerationozonein thestratosphere a )Name the gasthat disturbsthis balance b) Explainhow thisbalanceis disrupted ?
Answer» Solution :a) choloroflurocarbons(CFCs) B)In THESTRATOSPHERE , UV RAYS ACT onCFCsand releaseactiveClatoms , thatdegradesozonereleasingmolecular OXYGEN.

Discussion

4129.	Question : There has been an emphasis on the conservation of wild relative of cultivated plants because wild plants
Answer» Are NEEDED to understand the ORGIN of cultivated PLANTS Serve as valuable FODDER plants Carry many useful genes that are lost in cultivated plants Grow better than cultivated plants Answer :C

Discussion

4130.	Question : There exists a close association between the algae and the fungus within lichen. The fungus
Answer» FIXES atmospheric nitrogen for the ALGAE Provides shelter for the algae Provides protection, ANCHORAGE and ABSORPTION for the algae Releases `O_(2)` for the algae Solution :Provides protection, anchorage and absorption for the algae

Discussion

4131.	Question : There exists a close association between the alga and the fungus within a lichen. The fungus:
Answer» FIXES the atmoshpheric nitrogen for the alga provides PROTECTION, anchorage and absorption for the alga releases OXYGEN for the alga provides FOOD for the alga Answer :B

Discussion

4132.	Question : There ate two opposing views about origin of Moderm man. According to one biew, homoerectus in Asia were the ancestors of modern man. A study of variation could suggest this?
Answer» GREATER VARIATION i AFRICA than in ASIA. Variation only in Asia and no variation in Africa Greater variation in Asia than in Africa Similar variation in Africa and Asia Answer :C

Discussion

4133.	Question : There are_____pairs of salivary gland in mammal.
Answer» Two Three Four Six Answer :B

Discussion

4134.	Question : There are_____pairs of salivary gland in man.
Answer» ANSWER :THREE

Discussion

4135.	Question : There are various types of reproduction. The type of reproduction adopted by an organism depends on. (A) The habitat and morphology of the organism (B) Morphology of the organism (C) Morphology and physiology of the organism (D) The organism's habitat, physiology and genetic make up.
Answer» The HABITAT and morphology of the organism Morphology of the organism Morphology and physiology of the organism The organism.s habitat, physiology and genetic make up. Solution :The organism.s habitat, its internal physiology and several other FACTORS (genetic make up) are collectively RESPONSIBLE for how it reproduces. When offspring is PRODUCED by a single parent with or without the INVOLVEMENT of gamete formation, the reproduction is asexual.

Discussion

4136.	Question : There are two opposing views about origin of modern man.According to one view Homo erectus in Asia were the ancestor of modern man.A study of variations of DNA however suggested african origin of modern man. What kind of observation of DNA variation could suggest this:
Answer» GREATER VARIATION of AFRICA than in ASIA Variation only in asia and no variation in africa Greater variation in asia than in africa Similar variation in africa and asia Answer :A

Discussion

4137.	Question : There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA however suggested African origin of modern man. What kind of observation on DNA, variation could suggest this ?
Answer» GREATER VARIATION in ASIA than in AFRICA Greater variation in Africa than in Asia Similar variation in Africa and Asia Variation only in Asia and no variation in Africa Solution :Greater variation in Asia than in Africa

Discussion

4138.	Question : There are two opposing views about origin of modern man. According to one view Homo erectus in Asia was ancestor of modern man. A study of variations of DNA, however suggested African origin of modern man. What kind of observation on DNA variations could suggests this
Answer» Greater variation in Asia than in AFRICA Greater variation in Africa than in Asia Similar variation in Africa and Asia Variation only in Asia and no variation Africa. Solution :K-T Boundary. Boundary between rock sof cretaceous and tertiary periods, about 65 million years,often having iridium and marking the EXTINCTIONS of DINOSAURS.

Discussion

4139.	Question : There are two kind of camels arabian and bacteria the arabian camels have one hump nad bactrian camels possess
Answer» TWO humps ONE hump FOUR humps variable NUMBER of humps Answer :A

Discussion

4140.	Question : There are two breeds of donkeys in india these are small grey and large whit ethe large white is also called wild ass which occurs in
Answer» rajesthan BIHAR ASSAM RANN of kutch ANSWER :D

Discussion

4141.	Question : There are three genes a,b,c percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 18%. What is the sequence of genes on chromosome?
Answer» B,a,C a,b,c a,c,b None of these Answer :A

Discussion

4142.	Question : There are several arguments against Genetically Modified crops (G.M crops.). Organisations like 'Green Peace' protest against the cultivation of G.M. crops. Suppose you are also a protestor, what will be your two main arguments against G.M. crops?
Answer» Solution :i. GM crops MAY cross FERTILIZE with natural varieties producing unde sirable CHARACTERS. ii. Since GM crops CONTAIN genes from other ORGANISMS like bacteria, these may produce toxic chemicals harmful to humans.

Discussion

4143.	Question : Leeches do not have true blood vessels.
Answer» Solution :Reason: The blood vessels are replaced by CHANNELS called haemocoelic channels or CANALS filled with blood like FLUID.

Discussion

4144.	Question : Thereare __________ polarnucleiin theembryo sac .
Answer» 2 3 4 1 Solution :2

Discussion

4145.	Question :There are _________________ megadiverse countries and India ranks ______________ on global diversity scale .
Answer» 12, 8th 21, 8th 5, 4TH 30 , 12th Answer :A

Discussion

4146.	Question : There are no intermediate stages in the course of evolution according to
Answer» USE and DISUSE THEORY Natural selection theory MUTATION theory Modern synthetic theory ANSWER :C

Discussion

4147.	Question : There are many unusual organisms reported in Australia because of some special evolution. Mention the speciality of evolution that have occurred for the past 38 million years.
Answer» SOLUTION :GEOGRAPHICAL ISOLATION.

Discussion

4148.	Question : There are many different strains of rhinoviruses, which cause common cold. State why people are suffering from common cold several times within two or three months.
Answer» Solution :There are two views regarding this. a. Common cold results in the production of only short TERM MEMORY cells during primary IMMUNITY. Then the secondary immune response does not occur for a long span of time. b. For different viruses different antibodies are produced in the HUMAN body.

Discussion

4149.	Question : There are ….. In embryo sac(A) 8 cell, 7 nuclei(B) 7 cells, 7 nuclei(C) 8 cells, 8 nuclei(D) 7 cells, 8 nuclei
Answer» 8 CELL, 7 nuclei 7 CELLS, 7 nuclei 8 cells, 8 nuclei 7 cells, 8 nuclei Answer :D

Discussion

4150.	Question : There are four mechanism by which living organisms other bthan human beings maintan the constancy of internal environment .Name these processes.
Answer» SOLUTION :ORGANISMS maintain internal environment as constant by sweating SHIVERING deposition of fat layer below SKIN and hairy covering on body SURFACE.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Thermoregulatory centre in brain of man is

Question :Thermal powerplants are inevitablein anindustrialanddenselypopulated country likeour -whatharmthey do to the environment ? Alsomention any precaution that could be takento save our environment.

Question : Thermal power plants are inevitable in an industrialand densely populated country like ours what harm do they do the environment ?Also mention any precaution that could be taken to save our environment .

Question : Thermal pollution is harmful for aquatic animals.

Question : There was no degradation of any organic compounds arising in primitive earth because

Question : Thermal cycle takes place in which technique

Question : Thermal cycle is used in

Question : There was an article published in a -newspaper on DNA fingerprinting revealing procedure and its applications. Following terms were mentioned in this article : (i) Minisatellite (ii) Microsatellite Briefly mention about these terms.

Question : Therewas a cultural evolution ratherthanstrcuturalevolution after .

Question : There is shift in the policy of animal collection in the zoo from unlimited animals and limited facilities' to 'limited animals and adequate facilities'. Give reason.

Question : There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena.

Question : There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotide sequences can be deduced from a single amino acid sequence. Explain this phenomenon.

Question : There is no sugar in the urine. The blood entering the kidney has more sugar than the blood leaving the kidney. because -

Question : There is no natural death in single celled organisms like Amoeba and bacteria because : (A) They cannot reproduce sexually(B) They reproduce by binary fission(C) Parental body is distributed among the offspring(D) They are microscopic

Question : There is no division of cytoplasm after mitosis then the condition will be:

Question : There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.

Question : There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. Why? What are its adverse effects ?

Question : There is greater biodiversity in the tropical regions of the world.

Question : There is a restriction endonuclease called EcoRI. What does 'co' part in it stand for ?

Question : There is a type of conservation of genetic resources through their maintenance within natural or man made ecosystem. a. Which type of conservation is this? b. Give the importance of the protected areas and the divisions involved in this.

Question : There is a restriction endonuclease called Eco RI. What does 'co' part in it stand for ?

Question : There is a restriction endonuclease called EcoRI. What does "co" part in it stand for ?

Question : There is a restriction endonuclease called EcoR l . What does "co" part in it stand for?

Question : 'There is a paternity dispute for a child'. Which technique can solve the problem. Discuss the principle involved.

Question : There is a narrow range of concentration at which the elements are optimum. This statement is concerned with :-

Question : There is a large diversity in the biological world and each organism has evolved its own mechanism to multiply and produce offspring. The method of reproduction depends upon

Question : There isa balancebetween productionand degenerationozonein thestratosphere a )Name the gasthat disturbsthis balance b) Explainhow thisbalanceis disrupted ?

Question : There has been an emphasis on the conservation of wild relative of cultivated plants because wild plants

Question : There exists a close association between the algae and the fungus within lichen. The fungus

Question : There exists a close association between the alga and the fungus within a lichen. The fungus:

Question : There ate two opposing views about origin of Moderm man. According to one biew, homoerectus in Asia were the ancestors of modern man. A study of variation could suggest this?

Question : There are_____pairs of salivary gland in mammal.

Question : There are_____pairs of salivary gland in man.

Question : There are various types of reproduction. The type of reproduction adopted by an organism depends on. (A) The habitat and morphology of the organism (B) Morphology of the organism (C) Morphology and physiology of the organism (D) The organism's habitat, physiology and genetic make up.

Question : There are two opposing views about origin of modern man.According to one view Homo erectus in Asia were the ancestor of modern man.A study of variations of DNA however suggested african origin of modern man. What kind of observation of DNA variation could suggest this:

Question : There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA however suggested African origin of modern man. What kind of observation on DNA, variation could suggest this ?

Question : There are two opposing views about origin of modern man. According to one view Homo erectus in Asia was ancestor of modern man. A study of variations of DNA, however suggested African origin of modern man. What kind of observation on DNA variations could suggests this

Question : There are two kind of camels arabian and bacteria the arabian camels have one hump nad bactrian camels possess

Question : There are two breeds of donkeys in india these are small grey and large whit ethe large white is also called wild ass which occurs in

Question : There are three genes a,b,c percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 18%. What is the sequence of genes on chromosome?

Question : There are several arguments against Genetically Modified crops (G.M crops.). Organisations like 'Green Peace' protest against the cultivation of G.M. crops. Suppose you are also a protestor, what will be your two main arguments against G.M. crops?

Question : Leeches do not have true blood vessels.

Question : Thereare __________ polarnucleiin theembryo sac .

Question :There are _________________ megadiverse countries and India ranks ______________ on global diversity scale .

Question : There are no intermediate stages in the course of evolution according to

Question : There are many unusual organisms reported in Australia because of some special evolution. Mention the speciality of evolution that have occurred for the past 38 million years.

Question : There are many different strains of rhinoviruses, which cause common cold. State why people are suffering from common cold several times within two or three months.

Question : There are ….. In embryo sac(A) 8 cell, 7 nuclei(B) 7 cells, 7 nuclei(C) 8 cells, 8 nuclei(D) 7 cells, 8 nuclei

Question : There are four mechanism by which living organisms other bthan human beings maintan the constancy of internal environment .Name these processes.

Question :There are ___ megadiverse countries and India ranks on global diversity scale .