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biology cbse 2017

Biology CBSE2017

Exam Year 2017

Study,Assignments,SolvedPreviousYearPapers.QuestionsandAnswers.FreeForever.

Short AnswerType

Namethetypeofcrossthatwouldhelptofindthegenotypeofapeaplantbearingvioletflowers.

Answer

StatetwopostulatesofOparinandHaldanewithreferencetooriginoflife.

Answer

A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome thisproblem.

Answer

WhatareCrygenes?Inwhichorganismaretheypresent?

Answer

An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands.Writetheecologicalimplicationbecauseofit.

Answer

A pollen grain in angiosperm at the time of dehiscence from an anther could be 2-celled or 3-celled. Explain.Howarethecellsplacedwithinthepollengrainwhenshedata2-celledstage?

Answer

Differentiate between the genetic codes given below : (a) Unambiguous and Universal (b) Degenerate and Initiator

Answer

Mentiononeapplicationforeachofthefollowing:(a)Passiveimmunization(b)Antihistamine(c)Colostrum

(d)Cytokinin-barrier

Answer

Namethemicrobesthathelpproductionofthefollowingproductscommercially:(a)Statin(b)Citricacid

(c) Penicillin (d) Butyricacid

Answer

ListfourbenefitstohumanlifebyeliminatingtheuseofCFCs.

Answer

(a)CanaplantfloweringinMumbaibepollinatedbypollengrainsofthesamespeciesgrowinginNew

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biology cbse 2017 1

Biology CBSE2017

Exam Year 2017

Study,Assignments,SolvedPreviousYearPapers.QuestionsandAnswers.FreeForever.

  • Delhi ? Provide explanations to youranswer.
  • Answer
  • Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the differencebetweenthetwo.Namethecategoryofgeneticdisordertheybothcomeunder.
  • Answer
  • (a) List the two methodologies which were involved in human genome project. Mention how they were used.
    • Expand‘YAC’andmentionwhatwasitusedfor.
  • Answer
  • Write the characteristics ofRamapithecus, Dryopithecus and Neanderthal man.
  • Answer
  • Name a human disease, its causal organism, symptoms (any three) and vector, spread by intake of water and food contaminated by human faecalmatter.
  • Answer
  • (a) Write the desirable characters a farmer looks for in his sugarcane crop. (b) How did plant breeding techniqueshelpnorthIndianfarmerstodevelopcanewithdesiredcharacters?
  • Answer
  • Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain theprocess
  • Answer
  • (a)ExplainthesignificanceofpalindromicnucleotidesequenceintheformationofrecombinantDNA.
    • Writetheuseofrestrictionendonucleaseintheaboveprocess.
  • Answer
  • Describetherolesofheat,primersandthebacteriumThermusaquaticusintheprocessofPCR.
  • Answer
  • Explainthevariousstepsinvolvedintheproductionofartificialinsulin.
  • Answer
  • (a)‘‘Organismsmaybeconformersorregulators.’’Explainthisstatementandgiveoneexampleofeach.
    • Whyaretheremoreconformersthanregulatorsintheanimalworld?

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biology cbse 2017 2

Biology CBSE2017

Exam Year 2017

Study,Assignments,SolvedPreviousYearPapers.QuestionsandAnswers.FreeForever.

  • Answer
  • Describetheinter-relationshipbetweenproductivity,grossprimaryproductivityandnetproductivity.
  • Answer
  • Long AnswerType
  • It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.
    • Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discusssuchissueswiththeirgrowingchildren.
    • By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?
  • Answer
  • (a) When a seed of an orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.
  • (b)Aretheseembryosgeneticallysimilarordifferent?Comment.
  • Answer
  • (a)Compare,givingreasons,theJ-shapedandS-shapedmodelsofpopulationgrowthofaspecies.
  • (b) Explain ‘fitness of a species’’ as mentionedby Darwin.
  • Answer
  • Writethedifferentcomponentsofalac-operoninE.coli.Explainitsexpressionwhileinan’open’state.
  • Answer

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