Environmental Science

136 ENVIRONMENTAL SCIENCE

(c) Aggregation: In this stage, the successful immigrant individuals of a species

increase their number by reproduction and aggregate in large population in the

area. As a result individuals of the species come close to one another.

QUESTIONS

1. Explain the concept of an ecosystem with their structure and function.


2. Write the procedures of ecosystem in your own words.


3. Draw an energy flow in the ecosystem.


4. What is Ecological Succession, and food chain? Explain in your own words.


5. Write short notes on:
   (a) Ecological pyramids,
   (b) Types and characteristics,
   (c) Structure and functions of ecosystems.