1.
The word ecosystem was coined by:

2.
Ecosystem has two components:

3.
Which one of the following terms does not reflect the idea of ecosystem:

4.
Competition for water, minerals, light and space is most severe between two:

5.
Ecosystem is:

6.
Each human couple should produce only two children which help in:

7.
A habitat of long severe winters and growing season limited to a few months of summer constitutes:

8.
An ecosystem is:

9.
An ecosystem may be defined as:

10.
In natural ecosystem, decomposers include: