24277 + Interview Questions in Biology in Class 12 Page 27 InterviewSolution

1301.	Question : What is useful to prevent blood clotting in blood vessels?(A) Streptokinase(B) Cyclosporine(C) Statins(D) Hydroxyprojesteron
Answer» STREPTOKINASE CYCLOSPORINE Statins Hydroxyprojesteron SOLUTION :Streptokinase

Discussion

1302.	Question :What is useful in making of streptokinase ?
Answer» STAPHYLOCOCCUS BACTERIA AZOSPIRILLIUM bacteria STREPTOCOCCUS bacteria Clostridium bacteria Solution :Staphylococcus bacteria

Discussion

1303.	Question :What is used to remove weed in agriculture ?(A) Insecticide(B) Pesticides(C) Weedicide(D) Fungicides
Answer» INSECTICIDE PESTICIDES WEEDICIDE Fungicides SOLUTION :Weedicide

Discussion

1304.	Question : What is used to decrease cholesterol in blood ?(A) Stains(B) Lipase(C) Cyclosporin(D) Insulin
Answer» STAINS Lipase CYCLOSPORIN INSULIN SOLUTION :Stains

Discussion

1305.	Question :What is used in Laundry to remove oily blots?(A) Protease(B) Amaylase(C) Lipase(D) Cellulose
Answer» Protiase Amaylase LIPASE Cellulose SOLUTION :Lipase

Discussion

1306.	Question : What is unit of evolution?
Answer» ANSWER :POPULATION

Discussion

1307.	Question : What is ture of Canna flowers
Answer» IRREGULAR and BILATERAL symmetry Irregular and zygomorphic Irregular and RAIDAL symmetric Irregular and asymmetric Answer :D

Discussion

1308.	Question : What is TSM ? How does it classified and what does it focuses on ?
Answer» Solution :TSM stands for Traditional Systems of Medicines India has a rich medicinal heritage. A number of Traditional Systems of Medicine (TSM) are practied in India some of which come from outside India. TSM in India can be broadly classified into institutionalized or documented and non-institutionalized or oral traditions. Institutionalized Indian systems include Siddha and AYURVEDA which are PRACTICED for about two thousand years. These systems have prescribed texts in which the SYMPTOMS, disease diagnosis, drugs to cure, preparation of drugs, dosage and diet regimes, daily and seasonal regimens. Non-institutional systems, whereas, do not have such records and or practiced by rural and tribal PEOPLES across India. The knowledge is MOSTLY held in oral form. The TSM focus on healthy lifestyle and healthy diet for maintaining good health and disease reversal.

Discussion

1309.	Question :What is true regarding PS-II ?
Answer» It TAKES longer WAVELENGTH of LIGHT and ELECTRONS from `H_2O` It takes SHORTER wavelength of light and electrons from `H_2O` It takes longer wavelength of light and electrons from NADP It takes shorter wavelength of light and electrons from NADP Answer :B

Discussion

1310.	Question : What is true of plasmid ?
Answer» Found in viruses Contains genes for VITAL ACTIVITIES Part of nuclear chromosome Widely used in gene TRANSFER Solution :Widely used in gene transfer

Discussion

1311.	Question : What is true of law of independent assortment?
Answer» APPLICABLE to all the DOMINANT alleles Applicabkle to all GENES on the same chromosome Not applicable to genes PRESENT on the same chromosome Applicable to all the recessive alleles Answer :C

Discussion

1312.	Question : What is true for siphonostele ?
Answer» It has pith Adiantum and MARSILEA siphonostele Leafgaps are absent All of the above Answer :D

Discussion

1313.	Question : What is true of ecosystem?
Answer» PRIMARY consumers are LEAST DEPENDENT upon producers Primary consumers out NUMBER producers Producers are more than primary consumers Secondory consumers are the largest and most powerful Answer :C

Discussion

1314.	Question : What is true for plasmid ?
Answer» Found in viruses Contain genes for VITAL activities Part of NUCLEAR CHROMOSOME Widely used in GENE transfer Solution :Widely used in gene transfer

Discussion

1315.	Question : What is true for ecotone ? (a) It is a transition zone in between two different species (b) It is transition zone in between two different population (c) It is transition zone in between two different communities (d) Maximum species diversity occurs in ecotone
Answer» C,d a,d only d only b Answer :A

Discussion

1316.	Question :What is true for natural methods of contraception?
Answer» They INCREASE phagocytosis of sperms . They EMPLOY barriers to PREVENT FERTILISATION. They are natural WAYS of avoiding chances of fertilisation They are surgical methods and are terminal methods. Answer :C

Discussion

1317.	Question :What is true for Mendel ?
Answer» QUALITATIVE STUDY of qualitative CHARACTERS QUANTITATIVE study of quantitative characters Qualitative study of quantitative characters Quantitative study of Qualitative characters ANSWER :D

Discussion

1318.	Question : What is true for compound epithelium ?
Answer» It is MADE up of more than one layer of cells thus has a limited role in secretion and absorption. Its main function is to provide protection They cover the DRY SURFACE of the SKIN and moist surface of BUCCAL cavity All statements are true Answer :D

Discussion

1319.	Question : What is true about vein ?
Answer» All VEINS CARRY DEOXYGENATED blood EXCEPT coronary vein All veins carry deoxygenated blood except coronary vein They carry blood from organs, TOWARDS heart They carry blood from organs, towards heart Answer :C

Discussion

1320.	Question : What is true about the process of fertilization?
Answer» Only ACROSOME of spermsenters the egg Two haploid nuclei FUSE but thefusion NUCLEUS divides immediately to form two haploid nuclei. entry of sperm activates the egg to COMPLETE meiosis Only one spermenters an egg. ANSWER :D

Discussion

1321.	Question : What is true about the isolated small tribal population.?
Answer» There is a DECLINE in POPULATION as boys marry GIRLS only from their own tribe Hereditary diseases LIKE colour blindness do not spread in the isolated population Wrestlers who DEVELOP slrong body muscle in their life time pass this character on to their progeny. There is no change in population size as they have a large gene pool Answer :B

Discussion

1322.	Question : What is true about T-lymphocytes in mammals?
Answer» PRODUCED in thyroid Originate in lymphoid organs Scavenenge CELLULAR DEBRIS and damaged cells Are of three TYPES- cytotoxic T-cells, helper T-cells and suppresser T-cells. Answer :D

Discussion

1323.	Question : What is true about regulation of respiration -
Answer» Respiratory rhythm centre LIE on pons region. The role of oxygen in the regulation of respiratory rhythm is quite insignificant. Chemosensitive area of brain can recognise changes in `O_(2)` NEURAL signal from pneumotaxic centre can not CHANGE the DURATION of inspiration. Answer :B

Discussion

1324.	Question : What is true about Haldane effect ? (a) Occurs at the level of lungs (b) Diffusion of CO_(2)in alveoli from blood (c) Formation of oxyhaemoglobin
Answer» a and c a, B and c b and c None of these Answer :B

Discussion

1325.	Question : What is true about cork cambium?
Answer» It is extrastelar cambium in DICOT stem In dicot roots it ARISES from the cells of cortex region It is ALSO known as phellogen Both ( a ) & ( c ) ANSWER :C

Discussion

1326.	Question : What is true about classification ?
Answer» I, II and III II and IV I and II I and III Answer :A

Discussion

1327.	Question : What is true about Bt toxin?
Answer» The inactive protoxin gets converted into active form in the INSECT GUT Bt protein EXISTS as active toxin in the Bacillus The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication The concerned Bacilllls has ANTITOXINS ANSWER :A

Discussion

1328.	Question : What is true about Bt toxin
Answer» The concerned Bacillus has antitoxins. The inactive protoxin gets converted into active FORM in the insect GUT Bt protein exists as active toxin in the Bacillus The activated toxin ENTERS the ovaries of the pest to sterilise it and thus prevent its multiplication SOLUTION :The inactive protoxin gets converted into active form in the insect gut

Discussion

1329.	Question : what is true
Answer» hygrophytes have ISOBILATERAL ASTOMATIC leaves hygrophyes have hydathodes most of hygrohytes have hydayhodes xerophytes have more lenticels but THIN cuticle. Answer :C

Discussion

1330.	Question : What is true about Bt toxin ?(A) Bt protein exists as active toxin in the Bacillus.(B) The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its multiplication.(C) The concerned Bacillus has antitoxins.(D) The inactive protoxin gets converted into active form in the insect gut.
Answer» Bt protein EXISTS as active toxin in the BACILLUS. The ACTIVATED toxin enters the ovaries of the pest to sterilise it and thus PREVENT its multiplication. The concerned Bacillus has antitoxins. The inactive protoxin gets converted into active form in the insect gut. Teen SOLUTION :The inactive protoxin gets converted into active form in the insect gut.

Discussion

1331.	Question : What is trophic level in an ecosystem?
Answer» Solution :Based on the SOURCE of their nutrition or food, organisms OCCUPYING a specific place in the food chain is KNOWN as their trophic levels.

Discussion

1332.	Question : What is trophic level ?
Answer» SOLUTION :A specific POSITION occupied by an ORGANISM in the food CHAIN.

Discussion

1333.	Question : What is triticale?
Answer» Solution :(i) Triticale is the first man made cereal got by crossing. Wheat and Rye. (ii) It is an allopolyploid. (iii) Depending on PLOIDY LEVEL, it can be divided into 3 groups. (iv) It combines the high protein content of wheat with Rye's high content of amino ACID lysine which is low in wheat.

Discussion

1334.	Question : What is triphasic life cycle in red algae ?
Answer» SOLUTION :TheN/AlifeN/AhistoryN/AofN/AmostN/AredN/AalgaeN/AthusN/AconsistsN/AofN/AthreeN/Aphases:N/A(1)N/AaN/AhaploidN/Agametophyte,N/A(2)N/AaN/AdiploidN/Aphase,N/AtheN/Acarposporophyte,N/AandN/A(3)N/AanotherN/AdiploidN/Aphase,N/AtheN/Atetrasporophyte.N/ATheN/AcarposporophyteN/AgenerationN/AisN/AregardedN/AasN/AanN/AadditionalN/AwayN/AtoN/AincreaseN/AtheN/AgeneticN/AproductsN/AofN/AsexualN/AreproductionN/AwhenN/AfertilizationN/AratesN/AareN/Alow.

Discussion

1335.	Question : What is triticale ?
Answer» It is an inter GENETIC hybrid It is a MODIFIED form of WHEAT It is new PLANT produced by selection Wild ancestral wheat Answer :A

Discussion

1336.	Question : What is triple fusion ?Where and how does it take place ? Name the nuclei involved in triple fusion .
Answer» Solution :One of the male gametes fuses with the secondary nucleus is CALLED triple fusion . It takes place in the EMBRYO sac. After the normal fertilization i.e SYNGAMY (fusion of male gamete with EGG) the other nuclei involved in triple fusion is secondary nucleus or endosperm nucleus . They are DIPLOID .

Discussion

1337.	Question : What is triple fusion?
Answer» SOLUTION :Triple fusion is a fertilization that involves fusion of one male gamete with two polar nuclei in the CENTRAL cell of EMBRYO sac and forms triploid primary endosperm NUCLEUS, primary endosperm cell FINALLY becomes triploid endosperm.

Discussion

1338.	Question : What is transmitting tissue ?
Answer» Solution :(i) The canal of the STYLE in gynoecium is lined by a single layer of GLANDULAR canal cells called as transmitting TISSUE. (ii) They secrete mucilaginous substances. (iii) These serve as nutrition for growing pollen tubes and also control INCOMPATIBILITY reaction between style and pollen tube. (iv) The substances contain lipids, carbohydrate, compatibility controlling proteins ETC.

Discussion

1339.	Question : What is translation in protein synthesis ? Describeany twosteps of translations.
Answer» Solution :(1) Translation:Translationis the process in whichthe sequenceof codonon the m-RNAstrand is decodedand ACCORDINGLY amino acidsare SELECTED and futher joined with eachotherto form a polyeptide chain . Thispolypeptidechainthen forms a protein.Theprocess of translation involvesthe followingstepslikeactivation and formation of polypeptide chain . (2) ACTIVATION of amino acidsand formation of AA-tRNA complex: (1)ENZYME aminoacyl t-RNA synthetaase activates the amino acidmoleculesand theneachof thesemoleules get attached to spectifict-RNAmolecule. Thisattachment takes placeat 3'CCA end and forms aminoacyl t-RNA complex. (2)ATP is needed for thisreaction, Thisstep is also calledchargingof t-RNAor aminoacylation of t-RNA.

Discussion

1340.	Question : Define transmission genetics.
Answer» Solution :Transmission Genetics : It is also KNOWN as Classical Genetics-Deals with the transmission of GENES from PARENTS to offsprings. The foundation of classical genetics came from the studey of HEREDITARY behacviour of seven genes by GREGOR Mendel.

Discussion

1341.	Question : What is translation?
Answer» Solution :The PROCESS of TRANSLATION of NUCLEOTIDE language of MRNA into aminoacid language by tRNA is called translation.

Discussion

1342.	Question : What is transfection and transformation?
Answer» SOLUTION :INSERTING a vector into eukaryotic target cells is CALLED transfection, while inserting a vector into BACTERIAL target cells is called TRANSFORMATION.

Discussion

1343.	Question : What is transduction?
Answer» SOLUTION :Inserting a VECTOR into viral target CELLS is called TRANSDUCTION.

Discussion

1344.	Question : What is toddy?
Answer» SOLUTION :INFLORESCENCE of palmyra is tapped for its sap which is used as health drink. Sap is processed to get palm JAGGERY or fermented to give toddy.

Discussion

1345.	Question : What is tissue culture ? Mention any four applications.
Answer» Solution :Regenerating whole plant from an explant in culture MEDIUM. Applications: 1. PRODUCTION of large number of plants 2. Production of virus free plants through meristem culture. 3. Production of genetically similar plants. 4. Production of somatic hybrids by the FUSION of protoplast of two different varieties of plants. EX : pomato.

Discussion

1346.	Question : What is time period of speciation ?
Answer» SMALL Middle LONG Very small SOLUTION :Long

Discussion

1347.	Question : What is thermal stratification? Explain its types.
Answer» Solution :Thermal stratification is usually found in aquatic habitat. The change in the temperature profile with increasing depth in a water body is called thermal stratification. There are three kinds of thermal STRATIFICATIONS. 1.Epilimnion The upper LAYER of warmer water. 2. Metalimnion - The middle layer with a zone of gradual decrease in temperature. 3. HYPOLIMNION The BOTTOM layer of colder water.

Discussion

1348.	Question : What is thermal expansion?
Answer» Solution :Thermal Stratification is usually found in aquatic habitat. The change in the temperature profile with increasing depth in a water body is called thermal stratification. There are three KINDS of thermal stratifications. 1.Epilimnion - The UPPER layer of WARMER water. 2. Metalimnion -The middle layer with a zone of gradual decrease in temperature. 3. Hypolimnion -The bottom layer of colder water.

Discussion

1349.	Question : What is the"U" shaped curve between descending and ascending limbs of nephric tubule called?
Answer» ANSWER :LOOP of HENLE

Discussion

1350.	Question : What is therapy called when chemicals are used to kill the cancerous cells ?
Answer» ANSWER :CHEMOTHERAPY

Discussion

Explore topic-wise InterviewSolutions in .

Question : What is useful to prevent blood clotting in blood vessels?(A) Streptokinase(B) Cyclosporine(C) Statins(D) Hydroxyprojesteron

Question :What is useful in making of streptokinase ?

Question :What is used to remove weed in agriculture ?(A) Insecticide(B) Pesticides(C) Weedicide(D) Fungicides

Question : What is used to decrease cholesterol in blood ?(A) Stains(B) Lipase(C) Cyclosporin(D) Insulin

Question :What is used in Laundry to remove oily blots?(A) Protease(B) Amaylase(C) Lipase(D) Cellulose

Question : What is unit of evolution?

Question : What is ture of Canna flowers

Question : What is TSM ? How does it classified and what does it focuses on ?

Question :What is true regarding PS-II ?

Question : What is true of plasmid ?

Question : What is true of law of independent assortment?

Question : What is true for siphonostele ?

Question : What is true of ecosystem?

Question : What is true for plasmid ?

Question : What is true for ecotone ? (a) It is a transition zone in between two different species (b) It is transition zone in between two different population (c) It is transition zone in between two different communities (d) Maximum species diversity occurs in ecotone

Question :What is true for natural methods of contraception?

Question :What is true for Mendel ?

Question : What is true for compound epithelium ?

Question : What is true about vein ?

Question : What is true about the process of fertilization?

Question : What is true about the isolated small tribal population.?

Question : What is true about T-lymphocytes in mammals?

Question : What is true about regulation of respiration -

Question : What is true about Haldane effect ? (a) Occurs at the level of lungs (b) Diffusion of CO_(2)in alveoli from blood (c) Formation of oxyhaemoglobin

Question : What is true about cork cambium?

Question : What is true about classification ?

Question : What is true about Bt toxin?

Question : What is true about Bt toxin

Question : what is true

Question : What is trophic level in an ecosystem?

Question : What is trophic level ?

Question : What is triticale?

Question : What is triphasic life cycle in red algae ?

Question : What is triticale ?

Question : What is triple fusion ?Where and how does it take place ? Name the nuclei involved in triple fusion .

Question : What is triple fusion?

Question : What is transmitting tissue ?

Question : What is translation in protein synthesis ? Describeany twosteps of translations.

Question : Define transmission genetics.

Question : What is translation?

Question : What is transfection and transformation?

Question : What is transduction?

Question : What is toddy?

Question : What is tissue culture ? Mention any four applications.

Question : What is time period of speciation ?

Question : What is thermal stratification? Explain its types.

Question : What is thermal expansion?

Question : What is the"U" shaped curve between descending and ascending limbs of nephric tubule called?

Question : What is therapy called when chemicals are used to kill the cancerous cells ?