CBSE Class 12 Biology Solved Question Paper 2011

Short Answer Type

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Describe the Lactational Amenorrhea method of birth control.

Lactational amenorrhea method is a natural method of birth control. In this breastfeeding delays the onset of menstruation in new mothers. Breastfeeding halts the release of hormone that triggers ovulation. Is is based on the fact that ovulation does not occur during the period of intense lactation following parturition. 

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    The above graph shows Species-Area relationship. Write the equation of the curve “a‟ and explain.
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    Name the type of bioreactor shown. Write the purpose for which it is used:


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    Differentiate between in-situ and ex-situ approaches of conservation / of biodiversity.

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    The cell division involved in gamete formation is not of the same type in different organisms. Justify.

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    State the use of Biodiversity in modern agriculture. 

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    Draw a labelled diagram of the reproductive system in a human female.

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    Identify the type of the given ecological pyramid and give one example each of pyramid of number and pyramid of biomass in such cases.
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     Write the full form of VNTR. How is VNTR different from “Probe‟?

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    Differentiate between benign and malignant tumors.

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