The question paper will help in the practice and thereby further the preparation procedure of the students.
12 Which of the following organisms can act as primary consumer, secondary consumer, tertiary consumer or scavenger in different types of food chains ?
13. The tendency of biological systems to resist change and to remain in a state of equilibrium is called
(B) Feedback mechanism
(C) Ecological efficiency
(D) Carrying capacity
Click Here to find Environmental Science December 2012) complete question paper