Central Board of Secondary Education
Class – XII (Year 2009)
Subject – Biology - (Foreign)
All Questions are compulsory.
Wherever necessary, the diagrams drawn should be neat and
Q.1 BOD of two samples of water A and B were 120 mg/L and
400 mg/L respectively. Which sample is more polluted ?
Q.2 Name the type of interaction seen between whale and
the barnacles growing on its back.
Q.3 Which one of the following is used in apiculture:
Hilsa, Apis indica, Sonalika