Class – XII (Year 2011)

Subject – Biology - (Set - 2)

General Instructions:

1. All Questions are compulsory.

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

Q.1 Write the unit used for measuring ozone thickness.

Q.2 Name the event during cell division cycle that results in the gain or loss of chromosome.

Q.3 How can bacterial DNA be released from the bacterial cell for biotechnology experiments ?

(E-Book) CBSE Board Class 12th Papers PDF : Biology

Courtesy: cbse.nic.in