Secondary productivity is rate of formation ofnew organic matter by

Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

When peacock eats snakes which eat insects thriving on green plants, the peacock is

Nektons are

In ecological crisis, whom interference play important role