24277 + Interview Questions in Biology in Class 12 Page 273 InterviewSolution

13601.	Question : Many secondary metabolites of plants have medicinal properties. It is their misuse that creates problems. Justify the statement with an example.
Answer» Solution :Numerous secondary metabolites of PLANTS are used as pharmaceuticals, stimulants, suppressants (sedatives), tranquillizers, narcotics and hallucinogens. They are prescribed by the physician for the TREATMENT of mental illness like depression anxiety and insomnia, for increasing physical and mental performance and for elevating the mode. Morphine is the most patent sedative and PAINKILLER and is prescribed to patients who suffer from cancer or have undergone surgery. The use of such drugs is withdrawn as soon as the desired effect is achieved. The misuse of these plant metabolites on continuous basis or in higher doses makes the body dependent on them and leads to drug addiction. This creates problem not only for the drug addict but also for the family and society because: (a) Drug addicts BECOME weak physically as well as mentally and a victim of various diseases. (b) They fall prey to various antisocial activities. They are not able to take care of their families. basic needs making them to suffer. (C) Drug users can cause industrial accidents and social crimes.

Discussion

13602.	Question : Many scientists consider viruses as livingentitiesbecause these:
Answer» Respire Can cause disease REPRODUCE (INSIDE host) Reproduce to TOUGH ENVIRONMENT Answer :A

Discussion

13603.	Question : Many pollen tubes are formed during the germination of pollen grains in
Answer» Solanum Salvia Cucurbita Capsella Answer :C

Discussion

13604.	Question : Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin?
Answer» Solution :Secretion of toxic PROTEINS in inactive form is beneficial for the microorganisms that SECRETE them because the inactive toxic proteins get activated only when they are exposed to a SPECIFIC trigger like pH or temperature, etc. These triggers are absent in the microorganism, so they themselves REMAIN PROTECTED against their action.

Discussion

13605.	Question : Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin ?
Answer» Solution :Many proteins including certain toxins are secreted in their inactive form. They get ACTIVATED, only when exposed to a specific TRIGGER (PH,temperature, etc.). It is ADVANTAGEOUS to the bacteria PRODUCING it because the bacteria do not get killed due to the action of protein.

Discussion

13606.	Question : Many plant and animal species are on the verge of their extinction because of loss of forest land by indiscriminate use by the humans .As a biology student what method would you suggest along with its advantages that can protect such threatened species from getting extinct ?
Answer» SOLUTION :As a biology student ,I would suggest the given METHOD that can protect can protect these threatened spercies from BECOMING extinct. Ex Situ Convervation : The threatene species of palnts and animals are taken out of their HABITATS and are kept in special setting such as zoological parks, botanical gradens and wild life parks. The gametes of endangered species can be preserved by methods such as cryopreservation and can be fertilized in vitro and plants can be propageted through tissue CULTURE methods similarly ,seeds can be preserved in seed banks. This method is called an off side conservation method .

Discussion

13607.	Question : Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens ? What type of immunity do you observe in this case ?
Answer» Solution :The MUCUS coating of the epithelium lining of the gut helps in trapping MICROBES entering the BODY. Saliva in the mouth contains lysozyme which kills the pathogens. hydrochloric acid in gastric juice SECRETED by STOMACH prevent microbial growth. All these type of immunity is innate immunity.

Discussion

13608.	Question : Many of the flowering plants have developed some devices for discouraging inbreeding. Write any two of them.
Answer» Solution :Self-incompaibility POLLEN release and STIGMA RECEPTIVITY are not SYNCHRONISED.

Discussion

13609.	Question : Many ovules are present in ovary of:
Answer» PAPAYA Watermelon Orchid All of these Answer :D

Discussion

13610.	Question : Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens? What type of immunity do you observe in this case?
Answer» SOLUTION :Many microbialpathogensenter the gut of humans along with food. The PREVENTIVE barriers to protect the body from such pathogens are as FOLLOWS (i) the mucus coating of the epitheliumlining of the gut HELPS in trapping microbes entering the body. (ii) saliva in the mouth and hydrochloric acidin gastricjuice secretedby stomach prevent MICROBIAL growth. This type of immunityis innate immunity. It is present from birth andis inheritedfrom parents. The innate immunityremains throughoutlife.

Discussion

13611.	Question : Many lowlyingland becomesubmergedin comingcenturies dueto theincreasingtemperatureof atmospherea) Nametwogreenhousegasescausesglobalwarming b) write downthe measuresto reducethe emissionof green house gases
Answer» Solution :a) carbon dioxideand CHLORO flurocarbon B) 1) cutting down the useoffossilsfuels 2)Reducedeforestation ACTIVITIES

Discussion

13612.	Question : Many members of the genus………form mycorrhiza.(A) Glomus(B) Saccharomyces(C) Trichoderma(D) Monascus
Answer» GLOMUS Saccharomyces Trichoderma Monascus Answer :A

Discussion

13613.	Question : Many hybrids are sterile because their chromosomes do not pair up correctly during meiosis. Why are not polypoid plants sterile?
Answer» They BACKCROSS to the parental generation Most are triploid They CROSS polinate They self fertilise, using THERI DIPLOID gametes Answer :D

Discussion

13614.	Question : Many food chains are interconnected to each other form a network _____
Answer» SOLUTION :FOOD WEB

Discussion

13615.	Question : manyfreshwater animals cannot live forlongin sea waterand vice versa mainlybecause ofthe :
Answer» CHANGEIN Nlevels Variatins in lightintensity OSMOTIC PROBLEMS Spectralqualityof solarradiation. ANSWER :d

Discussion

13616.	Question :Many fresh water. animals can not survive in a marine environment. Explain.
Answer» Solution :Many freshwater ANIMALS can not SURVIVE in a MARINE environment because their bodies are not adapted to the marine environment. They lose body water because of the higher concentration of SALT in the surrounding water, which makes survival difficult.

Discussion

13617.	Question : What are causative and symptoms of Pneumonia ?
Answer» Difficulty in respiration, fever, chills, cough,headache Constipation, abdominal pain, CRAMPS, BLOOD clots Nasal congestion and discharge, cough, constipation, headache HIGH fever, weakness, STOMACH pain, loss of appetite and constipation Solution :Difficulty in respiration, fever, chills, cough, headache : Pneumonia Constipation, abdominal pain, cramps, blood clots : Amoebiasis Nasal congestion and discharge, cough, sorethroat, headache : Common cold High fever, weakness, stomach pain, loss of appetite and constipation : TYPHOID

Discussion

13618.	Question : Many desert plants have adaptations to prevent loss of water from their body. Mention any two adaptations to minimize water loss from plant body.
Answer» Solution :(i) Thick and waxy cuticle. (ii) STOMATA arranged in deep pits (sunken stomata). (iii) water stored in the PLANT body. (IV) Leaves are absent or modified into SPINES. (v) Photosynthetic function is carried out by the FLATTENED stem. (vi) CAM pathway

Discussion

13619.	Question : Many closely related species of marine invertebrates exist on either side of the isthmus of panama
Answer» premating ISOLATION isolation by DITANCE postmating isolation Answer :D

Discussion

13620.	Question : Many blue green algae occur in thermal spring (hot water spring). The temperature tolerance of these algae have been attributed to their
Answer» CELL wall STRUCTURE MODERN cell organisation Mitochondrial structure Branched chain LIPIDS in the cell mem- branes Answer :D

Discussion

13621.	Question : Many antibiotics inhibit prokaryotic translatin without disrupting protein synthesis of the host cell. These antibiotics work via all of the following mechanisms EXCEPT
Answer» Antibiotics bind to the ribosomal 50S subunit to PREVENT translation Antibiotics bind to the ribosomal 40S subunit to prevent translation Antibiotics bind 70S RIBOSOMES a similar sites and with similar efficacies Antibiotics bind FREE ribosomes in the cytoplasm Answer :B

Discussion

13622.	Question : Many adapations of an organism have evolved over a long duration of evolution and are known as
Answer» Genetically UNSTABLE Genetically FIXED Genetically disadvantageous Genetically extemporaneous Answer :B

Discussion

13623.	Question : Mannitol is the stored food in
Answer» Chara Porphyra Fucus Gracilaria Solution :(c) Fucus belongs to class-Phaeophyceae, in which RESERVE FOOD is found in form of laminarin, mannitol and oil.Chara belongs to class-Chlorophyceae,inwhich reserve food is found in form of starch and oil.PorphyraandGracillariabelongsto class-Thodophyceae,in which reserve food is found in form of floridean starch andGalactan`S_O_(2)` polymers.

Discussion

13624.	Question : Manipulating with nucleic acid is a trend in Biotechnology. (a) Name any one of organism used as vector. (b) What is DNA polymerase?
Answer» Solution :(a ) Bacteria - E-coli, Agrobacterium tumifaciens, Retrovirus, Plasmid, Ti-plasmid, pBR 322, bacteriophage, YEAST (any one organism or component used as vector) DNA polymerase is the enzyme which CATALYSES the polymerisation of deoxyribonucleotides into NEW DNA strand or extension of primer in PCR or commonly used tool in r DNA technology.

Discussion

13625.	Question : Manipulation of genes leads to productivity of new DNA.
Answer» SOLUTION :RECOMBINANT DNA (RDNA).

Discussion

13626.	Question : Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number.
Answer» 20 21 4 23 Answer :B

Discussion

13627.	Question : Mangoes do not and cannot grow in temperature regions. The most important environmental factor responsible for it is
Answer» SOIL TEMPERATURE WATER light Answer :B

Discussion

13628.	Question : Mangolian idiots are due to trisomy in 21^(st) chromosome is called:
Answer» Down's syndrome Turner's syndrome Kleinfelters syndrome Triplex syndrome Answer :A

Discussion

13629.	Question : Mango develops from –
Answer» MONOCARPELLARY gynoecium Apocarpous gynoecium Superior ovary Both (1) & (3) ANSWER :D

Discussion

13630.	Question : Mango and Guava are propagated through
Answer» TISSUE culture Grafting STEM cuttings Layering. Answer :B

Discussion

13631.	Question : Mango and guava plants are propagated through (A) Stem cutting (B) Layering (C) Grafting (D) Tissue culture
Answer» stem cutting laycring GRAFTING TISSUE CULTURE ANSWER :C

Discussion

13632.	Question : Mango and Guava are propagated through :
Answer» TISSUE culture Grafting Stem cuttings Layering Answer :B

Discussion

13633.	Question : Manas wild life sanctuary is situated in Odisha .
Answer» ANSWER :ASSAM

Discussion

13634.	Question : Man lived during late Miocene and early Pliocene period .........
Answer» DRYOPITHECUS Oreopithecus RAMAPITHECUS Kenyapithecus Solution :Ramapithecus

Discussion

13635.	Question : Man is a niammal and has incisors and canine. Rabbits are mammals but lack canines. Explain.
Answer» Solution :Man is omnivorous in his food habit. He eats plant and animal food. Therefore he has WELL developed incisors and canines. Rabbits are herbivorous in mode of NUTRITION. They NEED sharp incisors only. Canines or tearing teeth are hence ABSENT in rabbits.

Discussion

13636.	Question : Mangifera indica Linn. is a name of a plant species. In this name the term "Linn." is related to :-
Answer» Sub-SPECIFIC epithet Suffix for specific epithet Specific VARIETY of MANGO in Lucknow Name of SCIENTIST, who PROPOSED the nomenclatur Answer :D

Discussion

13637.	Question : Man is
Answer» Herbivorous Carnivorous omnivorous Producer Answer :C

Discussion

13638.	Question : Man is :
Answer» UNISEXUAL BISEXUAL Hermaphroditic Protogynous Answer :A

Discussion

13639.	Question : Man in the lifecycle of plasmodium is :
Answer» PRIMARY HOST SECONDARY host Intermediate host None of above Answer :A

Discussion

13640.	Question : "Man has lost his capacity to foresee and foresight,He will meet his own end by destroying the earth".Evaluate the statement and write your opinion.
Answer» Solution :STAEMENT is correct. Global warming, deforestation, pollution,POPULATION and exploison, ETC., destoying the earth.

Discussion

13641.	Question : "Man has lost his capacity to foresee and foresight,He will meet his own end by destroying the earth".Predict what will happen to nature if human race is abolished.
Answer» SOLUTION :Other DOMINANT SPECIES will EMERGE

Discussion

13642.	Question : 'Man has lost his capacity to foresee and foresight, he will meet his own end by destroying the earth.'' a. Evaluate this statement and write your opinion. b. Predict what will happen to nature is human race is abolished.
Answer» SOLUTION :a. The statement is correct. Due to the ACTIVITIES of human being, so many factors affecting the environment such as global warming, deforestation, pollution, population explosion, SOIL erosion etc. occur This causes imbalance in ecosystem and ultimately it destroys earth. b. If human race is abolished the above said activities are not seen and the earth.s ecosystem will develop. Due to the photosynthesis, the availability of oxygen will be more in the atmosphere. But on the other HAND the availability of the carbon dioxide the EXPIRATION which is useful for the photosynthesis will be lower because during the expiration `CO_(2)` is given to the atmosphere by animals (including humans).

Discussion

13643.	Question : Man has domesticated number of mammals for regular supply of .............
Answer» MEAT HONEY EGG MILK SOLUTION :Milk

Discussion

13644.	Question : Mammillary bodies are concerned with recognition of vision.
Answer» True False Answer :mammillary BODIES are CONCERNED with RECOGNITION of HEARING.

Discussion

13645.	Question : Man can become infected with trichinosis by
Answer» eating poorly cooked beef eating poorly cooked pork wading in polluted water or eating raw FISH cutting himself while dressing wild game Solution : This is a disease which results from eating poorly cooked pork which contains"Trichinella spiralis. EOSINOPHILIA, nausea, fever, DIARRHEA stiffness, and painful SWELLING of muscles are CHARACTERISTIC.

Discussion

13646.	Question : Mammary glands are modified______.
Answer» ANSWER :SWEAT GLAND,

Discussion

13647.	Question : Mammary gland is a modified :
Answer» Sebacious gland Sweat gland Cutaneous gland Scent gland Answer :B

Discussion

13648.	Question : Mammals of colder cilmates have shorter ears and limbs to minimise heat loss.This is come under
Answer» ALLEN's Rule bergmans rule jordansrule NONE of the above Answer :A

Discussion

13649.	Question : Mammals from colder climates generally have ........ ears and limbs to minimizes heat loss
Answer» Reduced Shorter Longer Wider ANSWER :B

Discussion

13650.	Question : Mammals are cold blooded animals.
Answer» True false Answer :WARM BLOODED

Discussion

Explore topic-wise InterviewSolutions in .

Question : Many secondary metabolites of plants have medicinal properties. It is their misuse that creates problems. Justify the statement with an example.

Question : Many scientists consider viruses as livingentitiesbecause these:

Question : Many pollen tubes are formed during the germination of pollen grains in

Question : Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin?

Question : Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin ?

Question : Many plant and animal species are on the verge of their extinction because of loss of forest land by indiscriminate use by the humans .As a biology student what method would you suggest along with its advantages that can protect such threatened species from getting extinct ?

Question : Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens ? What type of immunity do you observe in this case ?

Question : Many of the flowering plants have developed some devices for discouraging inbreeding. Write any two of them.

Question : Many ovules are present in ovary of:

Question : Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens? What type of immunity do you observe in this case?

Question : Many lowlyingland becomesubmergedin comingcenturies dueto theincreasingtemperatureof atmospherea) Nametwogreenhousegasescausesglobalwarming b) write downthe measuresto reducethe emissionof green house gases

Question : Many members of the genus………form mycorrhiza.(A) Glomus(B) Saccharomyces(C) Trichoderma(D) Monascus

Question : Many hybrids are sterile because their chromosomes do not pair up correctly during meiosis. Why are not polypoid plants sterile?

Question : Many food chains are interconnected to each other form a network _____

Question : manyfreshwater animals cannot live forlongin sea waterand vice versa mainlybecause ofthe :

Question :Many fresh water. animals can not survive in a marine environment. Explain.

Question : What are causative and symptoms of Pneumonia ?

Question : Many desert plants have adaptations to prevent loss of water from their body. Mention any two adaptations to minimize water loss from plant body.

Question : Many closely related species of marine invertebrates exist on either side of the isthmus of panama

Question : Many blue green algae occur in thermal spring (hot water spring). The temperature tolerance of these algae have been attributed to their

Question : Many antibiotics inhibit prokaryotic translatin without disrupting protein synthesis of the host cell. These antibiotics work via all of the following mechanisms EXCEPT

Question : Many adapations of an organism have evolved over a long duration of evolution and are known as

Question : Mannitol is the stored food in

Question : Manipulating with nucleic acid is a trend in Biotechnology. (a) Name any one of organism used as vector. (b) What is DNA polymerase?

Question : Manipulation of genes leads to productivity of new DNA.

Question : Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number.

Question : Mangoes do not and cannot grow in temperature regions. The most important environmental factor responsible for it is

Question : Mangolian idiots are due to trisomy in 21^(st) chromosome is called:

Question : Mango develops from –

Question : Mango and Guava are propagated through

Question : Mango and guava plants are propagated through (A) Stem cutting (B) Layering (C) Grafting (D) Tissue culture

Question : Mango and Guava are propagated through :

Question : Manas wild life sanctuary is situated in Odisha .

Question : Man lived during late Miocene and early Pliocene period .........

Question : Man is a niammal and has incisors and canine. Rabbits are mammals but lack canines. Explain.

Question : Mangifera indica Linn. is a name of a plant species. In this name the term "Linn." is related to :-

Question : Man is

Question : Man is :

Question : Man in the lifecycle of plasmodium is :

Question : "Man has lost his capacity to foresee and foresight,He will meet his own end by destroying the earth".Evaluate the statement and write your opinion.

Question : "Man has lost his capacity to foresee and foresight,He will meet his own end by destroying the earth".Predict what will happen to nature if human race is abolished.

Question : 'Man has lost his capacity to foresee and foresight, he will meet his own end by destroying the earth.'' a. Evaluate this statement and write your opinion. b. Predict what will happen to nature is human race is abolished.

Question : Man has domesticated number of mammals for regular supply of .............

Question : Mammillary bodies are concerned with recognition of vision.

Question : Man can become infected with trichinosis by

Question : Mammary glands are modified______.

Question : Mammary gland is a modified :

Question : Mammals of colder cilmates have shorter ears and limbs to minimise heat loss.This is come under

Question : Mammals from colder climates generally have ........ ears and limbs to minimizes heat loss

Question : Mammals are cold blooded animals.