Central Board of Secondary Education
Class – XII (Year 2010)
Subject – Biology
All Questions are compulsory.
Wherever necessary, the diagrams drawn should be neat and
Q.1 Mention the site where syngamy occurs in amphibians
and reptiles respectively.
Q.2 How is now - blindness caused in humans ?
Q.3 How is the action of axonuclease different from that
of endonuclease ?