The functional aspect of an ecosystem mainly refers to:

Driving force of an ecosystem is:

Which of the following is correct sequence of ecosystem in order of decreasing productivity?

The species which are in danger of extinction are known as?

With reference to lichens, which of the following statements is/are correct? 1. Lichens are very good indicators of pollution. 2. Lichens grow well in polluted areas.

In mycorrhizal association, the advantage of plant is: