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

The word ecosystem was coined by:

A. Daubenmire/R.Misra/Koestle

B. Tansley

C. Weaver and Clements

D. Odum/Kormondy

Ecosystem has two components:

A. Plants and animals

B. Weeds and trees

C. Biotic and abiotic

D. Frogs and men

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

A. Holocoene

B. Cherposem

C. Biosystem

D. Geobiocoenosis

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

A. Closely related species occupying the same niche

B. Closely related species occupying different niche

C. Unrelated species occupying the same niche

D. Species occupying different overlapping ecosystems

Ecosystem is:

A. Both open and closed unit depending upon the biomass present

B. Closed unit

C. Open unit

D. Both open and closed unit depending upon community type