12th Class Biology Sample Paper

done Biology - Sample Paper-15 Total Questions - 27    [Download]

• question_answer1)
  In a biology class, teacher asked Sachin the type of gametes that can be predicted if a diploid organism is heterozygous for 4 loci. But Sachin failed to answer this. Consider yourself as a bright biology student and answer the same :
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• question_answer2)
  Distillation is required for the production of certain alcoholic drinks. Give reason.
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• question_answer3)
  Oviducts in human females are meant to carry the egg from the ovary to the uterus. State the four different regions of an oviduct?
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• question_answer4)
  Why does the distance between the two polynucleotide strands of DNA remains almost constant?
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• question_answer5)
  Name any two varieties of cauliflower resistant to diseases like black rot and curl blight black rot.
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• question_answer6)
  Mention any two striking conclusions that can be derived from the process of succession.
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• question_answer7)
  It is necessary for a country like India to get patented its traditional knowledge. Justify.
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• question_answer8)
  Refrigerants are considered to be a necessity in modern living, but are said to be responsible for ozone depletion. Justify.
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• question_answer9)
  Transcription and translation can be coupled in prokaryotic cells but not in eukaryotic cells. Give reason.
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• question_answer10)

  (i) What is infertility?

  (ii) Test tube baby technique can solve infertility problem. Explain.

  Or

  (i) Cite some common causes of infertility in human females.

  (ii) What could be the effective preventive measures to avoid sexually transmitted diseases?

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• question_answer11)
  You as a responsible person are given a duty to take steps alongwith your friends and neighbourhood to protect the destruction of surrounding plants and killing of small animals.

  (i) How would you encourage, satisfy or guide people around you about the importance of each and every organism present in the world?

  (ii) Also, mention the hypothesis which you will use to encourage them.

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• question_answer12)
  Name the natural source of agarose. Mention one role of agarose in biotechnology.
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• question_answer13)

  (i) List any two situations in which preformed antibodies are given to a person. What kind of immunisation is it? Also, discuss its advantages.

  (ii) What is autoimmunity?

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• question_answer14)
  It is rightly said in evolutionary biology that 'nature selects for fitness'. Justify with suitable example.
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• question_answer15)
  Prakash was a farmer who had been growing paddy repeatedly on a small piece of his land. With time, he observed that the yield was decreasing. He went to agriculture centre of his locality where a agriculturist advised him to use Nostoc and stop the use of chemical fertilisers.

  (i) What is Nostoc?

  (ii) How does Nostoc help to increase the yield of paddy?

  (iii) What values were shown by Prakash?

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• question_answer16)
  As a responsible and educated citizen of a nation like India, put your views on international cooperation on global warming and climate change.
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• question_answer17)
  Explain totipotency and micropropagation. How are both interconnected?
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• question_answer18)
  In which condition adaptive radiation leads to adaptive convergence? Explain with the help of an example.
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• question_answer19)
  Avik's father was smoking cigarette while watching TV in the main hall. Avik insisted him to smoke outside the house and also to give up smoking as it is harmful to health.

  (i) Why did Avik's insist his father to smoke outside the house?

  (ii) Why should Avik father quit smoking?

  (iii) What values were shown by Avik?

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• question_answer20)
  Differentiate between the following.

  (i) mRNA and tRNA

  (ii) Repetitive DNA and satellite DNA

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• question_answer21)
   

  Draw the labelled diagram of a mature embryo sac found in most of the flowering plants.

  Or

  Pollination acts as the phenomenon of transfer of pollen grains from anther to the stigma of either same plant or a different plant. What is the significance of this phenomenon?

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• question_answer22)
  How is genetic engineering used in the production of recombinant vaccine? Give two examples of such vaccines.
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• question_answer23)
  During menstrual cycle, uterus also shows cyclical changes.
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• question_answer24)
  Biopiracy has exploited the developing countries more than in comparison to the developed countries. Explain with the help of an example.
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• question_answer25)

  (i) Embryo sacs of some apomictic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.

  (ii) Why is the presence of both chasmogamous and cleistogamous flowers on the same plant beneficial? Explain with examples.

  Or

  In plants vegetative propagation occurs naturally also. Explain with the help of examples. Give its significances also.

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• question_answer26)

  Give a detail account of evolution in plants and animals.

  Or

  Write short notes on the following:

  (i) Bioinformatics

  (ii) VNTRs

  (iii) Autoradiography

  (iv) Splicing

  (v) Capping

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• question_answer27)

  (i) How ozone hole will affect our lives?

  (ii) Algal bloom is result of accelerated eutrophication. Explain.

  (iii) How is solid waste management being carried out?

  Or

  (i) State the consequences of the following components on the ecosystem.

  (a) all producers are removed.

  (b) all organisms of herbivore level are eliminated.

  (c) all top carnivores population is removed.

  (ii) Ecosystem services are the products of ecosystem process. Comment.

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