CBSE Class 12 Biology Question Paper 2012

CBSE CLASS XII Questions

• 1.

  Study the given chart showing evolution of plants. Answer the following questions : 

  

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• 2.

  Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons

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• 3.

  Draw the structure of an antibody molecule and label any four of its parts.

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• 4.

  Mention the source and the functions of the above mentioned hormones.

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• 5.

  The process of copying genetic information from template strand of DNA into RNA is called transcription. It is mediated by RNA polymerase. Transcription takes place in the nucleus of eukaryotic cells. In transcription, only a segment of DNA and only one of the strands is copied into RNA. 

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• 6.

  Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.

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