24277 + Interview Questions in Biology in Class 12 Page 25 InterviewSolution

1201.	Question : What term is used for a virus that infects a bacterium?
Answer» ANSWER :BACTERIOPHAGE

Discussion

1202.	Question : What term is applied to the sexual cycle in non-primate mammals ?
Answer» ANSWER :Oestrous

Discussion

1203.	Question : What term describes the changes in the chemical structure of genes or DNA ?
Answer» ANSWER :MUTATION

Discussion

1204.	Question : What term is applied for the various external genital orgens in a woman ?
Answer» ANSWER :VULVA

Discussion

1205.	Question : Whatterm bestdescribse the separationof DNA strands from theAgarosegel afterelectrophoresis ?
Answer» PRECIPITATION BLOTTING Elution Splcing Answer :C

Discussion

1206.	Question : What temperature range fishes can tolerate?
Answer» SOLUTION :Up to `33^(@)C (95^(@)F).`

Discussion

1207.	Question : What temperature is kept during denaturization ?
Answer» `90-95^(@)C` `80-85^(@)C`C `100-110^(@)C` `75-80^(@)C` SOLUTION :`90-95^(@)C`

Discussion

1208.	Question : What substances are the maximum composition of honey ?
Answer» ANSWER :LEVULOSE

Discussion

1209.	Question : what structure connects foetus with the uterine wall ?
Answer» ANSWER :PLACENTA

Discussion

1210.	Question : What structures is used for a period from birth to natural death in an organism.
Answer» ANSWER :LIFE SPAN

Discussion

1211.	Question : What structures are formed form a plant ovary?
Answer» ANSWER :FRUIT

Discussion

1212.	Question : Whatstatementis not true:
Answer» Allantois is not involved in formation of PLACENTA. Placenta is FORMED only by chorionic VILLI HUMAN placenta is amnio-chorionic placenta. All of the above. ANSWER :D

Discussion

1213.	Question : What steps should be taken to maintain good health?
Answer» SOLUTION :PERSONAL hygiene,REGULAR exercise and balanced diet are very important to maintain GOOD health.

Discussion

1214.	Question : What size of particles can cause greatest harm to human health ?
Answer» 2.5 MICROMETERS or less 2.5 micrometers or more 2 micrometers or less 2 micrometers or more ANSWER :A

Discussion

1215.	Question : What should happen if a thin slice of sugar beet is placed in a concentrated solution of NaCl?
Answer» It should BECOME turgid It should neither ABSORB water nor loose it It should absorb water from the NACL solution It should loose water from the cells Answer :D

Discussion

1216.	Question : Write short note on Pollen kitt.
Answer» Solution :Pollenkit is contributed the tepetum and coloured yellow or orange and is the chiefly made of carotenoids or flavonoids. If is OILY layer FORMING a thick viscous coating over POL... Surface It attached INSECTS and PROTECTS damage from UV radiation .

Discussion

1217.	Question : What shall be the genotypic ratio in F_(2) generation of monohybrid cross?
Answer» `3:1` `1:2:1` `1:1:1` NONE of the above Answer :B

Discussion

1218.	Question : What scar is left on ovary by the corpus luteum in case of failure of fertilization and pregnancy ?
Answer» ANSWER :CORPUS ALBICANS

Discussion

1219.	Question :What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced by some unique microorganisms?
Answer» Solution :Enzymes USED in DETERGENTS are: (a) Lipase for REMOVING fat-based stains is manufactured by CANDIDA lipolytica and Geotrichum candidum. Amylase for removing starch-based stains is produced by Aspergillus oryzae and Bacillus diastaticus.

Discussion

1220.	Question : What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced from some unique microorganisms ?
Answer» Solution :MICROBES are also used for production of enzymes. Lipases are used in detergent FORMULATIONS and are helpful in removing OILY stains from the LAUNDRY. Lipases are produced by Candida lipolytica (FUNGUS) and Geotrichum candidum.

Discussion

1221.	Question : What role does the tapetum play?
Answer» Solution :The tapetum PLAYS an IMPORTANT role in providing nutrition to sporogenous TISSUE and microspores.

Discussion

1222.	Question : What role should society play towards HIV infected people ?
Answer» Solution :HIV/AIDS infected people may need help and sympathy instead of being shunned by society. Unless society recognizes it as a problem to be dealt with in a collective manner, the CHANCES of wider SPREAD of the disease increase MANIFOLD. It is a MALADY that can only be tackled, by the society and medical fraternity acting TOGETHER, to prevent the spread of disease.

Discussion

1223.	Question : What role does the following organs play in our body (a) Mammae in male (b) Wisdom teeth (c) Human appendix.
Answer» Solution :Mammae in male, WISDOM teeth, HUMAN appendix-all these organs are functionless and has no ROLE in our body system. They are commonly called as VESTIGIAL organs.

Discussion

1224.	Question : What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Answer» Solution :Menstrual Phase (1-5 days) Endrometrium breaks down the cell of endometrium SECRETIONS unfertilised ovum constitute menstrual flow. Progesteron production is reduced Follicular Phase (6-13 days) Endometrium rebuilds, FSH and oestrogen secretion is increased. Ovulatory Phase (14-16 days) Both LH and FSH attain peak level. Estrogen level is also high. It leads to OVULATION. Luteal Phase (16-28 days) In adsence of fertilisation corpus luteum secretes progesterone. Endometrium Thickens and uterine glands become secretary. The menstrual cycle starts with the menstrual phase, when menstrual flow occurs and it laste for 3-5 days. It results due tobreakdown of endometrial lining of the uterus and its blood vessels. Follicular Phase The menstrual phase is followed by the follicular phase. During this phase, the primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously the endometrium of uterus regenerates through PROLIFERATION. These changes in the ovary and the uterus are induced by changes in the levels of pituitatary and ovarian hormones. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase and stimulates follicular development as well as secrtion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of cycle (about 14th day). Rapid secretion of LH leading to its meximum level during the mid-cycle LH surge induces RUPTURE of Geaafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatroy phase) is followed by the luteal phase during which the remaining PARTS amounts of progesterone which is essential for maintenance of the endometrium. Such an endometrium is necessary for implantation of the fertilised ovum and other events of pregnancy. In the absence of fertilisation, the corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation.

Discussion

1225.	Question : What role do, calcium, magnesium and chloride ions play in photosynthesis?
Answer» Solution :The ions, such as CALCIUM, magnesium and chloride play an IMPORTANT role in PHOTOLYSIS of water during the PROCESS of PHOTOSYNTHESIS.

Discussion

1226.	Question : What represents the steady state
Answer» INTAKE of food materials, OXYGEN and water Elimination of WASTE materials and energy Intake of materials, energy and elimination of waste products INCLUDING energy None of the above Answer :C

Discussion

1227.	Question : What refers to the richness of different species in a range of habitats within a geographical area ?
Answer» `GAMMA`-DIVERSITY `ALPHA`-diversity `BETA`-diversity All given Solution :`gamma`-diversity

Discussion

1228.	Question : What refers to the variety of microbes, plants and animals of an area ?
Answer» Divesity of ECOSYSTEM The degree of VARIETY in NATURE ABIOTIC variety (A) and (B) both Solution :The degree of variety in nature

Discussion

1229.	Question : What provides temporary storage to immature sperms?
Answer» SEMINIFEROUS tubules Vasa efferentia Vas deferens Epididymis ANSWER :D

Discussion

1230.	Question :What provides immunity against the diseases ?
Answer» Antigen IGG HISTAMINE HIV PROTEIN SOLUTION :IgG

Discussion

1231.	Question : What provided energy for a biotie syntbesis on primitive earth
Answer» Solution : Very HIGH temperatures DUE to LIGHTENING or UVE rays prosided onergy for beotic synthesis.

Discussion

1232.	Question : What Protocol was signed international to control the emission of ozone depleting substance.
Answer» SOLUTION :MONTREAL protocol was SIGNED at Montreal in Canada in 1987 to control the EMISSION of ozone depleting substances. It laid down definite road maps, separately for developed and DEVELOPING counties for reducing the emissionof CFCs and other ozone depleting chemicals.

Discussion

1233.	Question : What protein is secreted by osteoblast to form the matrix ?
Answer» ANSWER :OSSEIN

Discussion

1234.	Question : What protein is found in the cartilage?
Answer» ANSWER :Chondrin

Discussion

1235.	Question : What prokaryotic adaptation accurred during the oxygen revolution and opended up the possibility for energhy demanding multicelluar life forms?
Answer» ELECTRON transport systems Anaerobic FERMENTATION Acrobic respiration Photosynthesis Answer :C

Discussion

1236.	Question : What precautions should be taken to avoid smoking ?
Answer» SOLUTION :A packet of cigarettes one cannot miss the statutory warning that is present on the packing which warns against smoking and says how it is injurious to health. Inspite of the warning that is present smoking is prevalent among young and old. Knowing the DANGERS of smoking and chewing tobacco, and its additive nature, the youth and old need to AVOID these habits. Counseling and medical HELP are required by any addict to get rid of this life threatening habits.

Discussion

1237.	Question : What price tag did Robert Constanza put forundamental ecosystem services ?
Answer» 33 TRILLION US `$` 22 trillion US `$` 11 trillion US `$` 44 trillion US`$` Solution :33 trillion US `$`

Discussion

1238.	Question : What prevents a child to suffer from a disease when he is vaccinated against? Give one reason.
Answer» SOLUTION :The child is vaccinated by inactivated/weakened PATHOGENS against which BODY PRODUCES ANTIBODIES. The antibodies prevent the child from the disease.

Discussion

1239.	Question : What precautions are required for disease spreading through vectors ?
Answer» SOLUTION :Malaria and filariasis are transmitted through insect vectors. The most important measure is to control or eliminate the vectors and their breeding places. This can be achieved by avoiding stagnation of water in an around residential areas. Regular cleaning of household cooler, use of mosquito nets, introducing fishes like Gambusia in ponds that feed on mosquito larvae, spraying of insecticide in ditches, drainage areas and swamps, etc. In addition doors and windows should be provided with wire MESH to prevent entry of mosquito mesh to prevent the entry of mosquitoes. Such precautions have become all the more important especially in the light of recent widespread incidences of the vector borne (AEDES mosquitoes) disease like dengue and chickengunya in many parts of India.

Discussion

1240.	Question : What precautions are required in case of air borne disease such pneumonia and common cold?
Answer» Solution :In addition to the above precautions, close CONTACT with infected PERSONS or their BELONGING should be AVOIDED.

Discussion

1241.	Question : What plays an important role in primary and secondary response ?
Answer» Solution :The primary and secondary response are CARRIED out with the help of two special types of LYMPHOCYTES present in our body that is B-lymphocytes and T-lymphocytes. B-lymphocytes produce an ARMY of PROTEINS in response to pathogens into our blood to fight with them. These proteins are CALLED antibodies. T-lymphocytes themselves do not secrete antibodies but help B-lymphocytes to produce antibodies.

Discussion

1242.	Question : What phenotypic ratio is obtained by selfing of a trihybrid, in which two gene pairs are completely dominant and one gene pair is incompletely dominant ?
Answer» `3:6:3:1:2:1` `27:9:9:9:3:1:3:3` `18 : 6 : 6 : 2 : 9 : 3 : 3 : 1 : 9 : 3 : 3 : 1` `18 : 6 : 6 : 2 : 9 : 3 : 3 : 1 : 1 : 2 : 1` ANSWER :C

Discussion

1243.	Question : What persentage of proteins and lipids respectively are present in the membrane of human erythrocyte cell?
Answer» 40% and 52% 52% and 40% 48% and 52% 50% and 42% ANSWER :B

Discussion

1244.	Question : What percentage of the dry weight of an organism does carbon constitute ?
Answer» `70%` `90%` `40%` `49%` SOLUTION :`49%`

Discussion

1245.	Question : What percentage of progenies would have broad leaves and pink flower i F_(2) generation of Snapdragon if first trait follow law of dominance and the other shows incomplete dominance ?
Answer» 0.375 0.5625 0.625 0.125 Answer :A

Discussion

1246.	Question : What percentage of progenies when there is marriage between colourblind father's son and colourblind mother's daughter -
Answer» 50% SONS COLOUR blind 50% DAUGHTERS carriers 50% daughters normal All of these Answer :D

Discussion

1247.	Question : What percentage of pea seeds would have intermediate size of starch grains in F_(2) generation?
Answer» 0 0.25 0.5 0.75 Answer :C

Discussion

1248.	Question : What percentage of offsprings would have the genotype AA Bb Cc in F_(2) generation of a trihybrid cross -
Answer» 0.125 0.0625 0.25 0.375 Answer :B

Discussion

1249.	Question : What percentages of PAR can be captured by plants ?
Answer» more than 50% 0.5 20 to 40% 2 to 10% ANSWER :D

Discussion

1250.	Question : What percentage of human genome codes for proteins?
Answer» `GT 5%` 5-10% gt 2% LT 2% ANSWER :D

Discussion

Explore topic-wise InterviewSolutions in .

Question : What term is used for a virus that infects a bacterium?

Question : What term is applied to the sexual cycle in non-primate mammals ?

Question : What term describes the changes in the chemical structure of genes or DNA ?

Question : What term is applied for the various external genital orgens in a woman ?

Question : Whatterm bestdescribse the separationof DNA strands from theAgarosegel afterelectrophoresis ?

Question : What temperature range fishes can tolerate?

Question : What temperature is kept during denaturization ?

Question : What substances are the maximum composition of honey ?

Question : what structure connects foetus with the uterine wall ?

Question : What structures is used for a period from birth to natural death in an organism.

Question : What structures are formed form a plant ovary?

Question : Whatstatementis not true:

Question : What steps should be taken to maintain good health?

Question : What size of particles can cause greatest harm to human health ?

Question : What should happen if a thin slice of sugar beet is placed in a concentrated solution of NaCl?

Question : Write short note on Pollen kitt.

Question : What shall be the genotypic ratio in F_(2) generation of monohybrid cross?

Question : What scar is left on ovary by the corpus luteum in case of failure of fertilization and pregnancy ?

Question :What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced by some unique microorganisms?

Question : What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced from some unique microorganisms ?

Question : What role does the tapetum play?

Question : What role should society play towards HIV infected people ?

Question : What role does the following organs play in our body (a) Mammae in male (b) Wisdom teeth (c) Human appendix.

Question : What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.

Question : What role do, calcium, magnesium and chloride ions play in photosynthesis?

Question : What represents the steady state

Question : What refers to the richness of different species in a range of habitats within a geographical area ?

Question : What refers to the variety of microbes, plants and animals of an area ?

Question : What provides temporary storage to immature sperms?

Question :What provides immunity against the diseases ?

Question : What provided energy for a biotie syntbesis on primitive earth

Question : What Protocol was signed international to control the emission of ozone depleting substance.

Question : What protein is secreted by osteoblast to form the matrix ?

Question : What protein is found in the cartilage?

Question : What prokaryotic adaptation accurred during the oxygen revolution and opended up the possibility for energhy demanding multicelluar life forms?

Question : What precautions should be taken to avoid smoking ?

Question : What price tag did Robert Constanza put forundamental ecosystem services ?

Question : What prevents a child to suffer from a disease when he is vaccinated against? Give one reason.

Question : What precautions are required for disease spreading through vectors ?

Question : What precautions are required in case of air borne disease such pneumonia and common cold?

Question : What plays an important role in primary and secondary response ?

Question : What phenotypic ratio is obtained by selfing of a trihybrid, in which two gene pairs are completely dominant and one gene pair is incompletely dominant ?

Question : What persentage of proteins and lipids respectively are present in the membrane of human erythrocyte cell?

Question : What percentage of the dry weight of an organism does carbon constitute ?

Question : What percentage of progenies would have broad leaves and pink flower i F_(2) generation of Snapdragon if first trait follow law of dominance and the other shows incomplete dominance ?

Question : What percentage of progenies when there is marriage between colourblind father's son and colourblind mother's daughter -

Question : What percentage of pea seeds would have intermediate size of starch grains in F_(2) generation?

Question : What percentage of offsprings would have the genotype AA Bb Cc in F_(2) generation of a trihybrid cross -

Question : What percentages of PAR can be captured by plants ?

Question : What percentage of human genome codes for proteins?