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(Download) CBSE: Class XII Biology Question Paper - 2009 - (Delhi)

Central Board of Secondary Education

Class – XII (Year 2009)

Subject – Biology - (Delhi)

General Instructions:

  1. All Questions are compulsory.

  2. Wherever necessary, the diagrams drawn should be neat and properly labelled.

Q.1 Why hnRNA is required to undergo splicing ?

Q.2 How does colostrum provide initial protection against diseases to new born infants ?

Q.3 Name the group of organisms and the substrate they act on to produce biogas.