What is primary productivity? Give brief description that affect primary productivity.

What is primary production?

What is net primary productivity?

Define Productivity. What is primary productivity? Give brief description of factors that affect primary productivity.

What is primary sludge?

Primary root is

Justify the following statement in terms of ecosystem dynamics. "Nature tends to increase the gross primary productivity, while man tends to increase the net primary -productivity".

Name the factor which affect the primary productivity?