Match the following columns correctly.

Column-$I$	Column-$II$
$(a)$ Gross Primary Productivity	$(1)$ $NPP$
$(b)$ Net Primary Productivity	$(2)$ $SP$
$(c)$ Secondary Productivity	$(3)$ $GPP$

The rate of formation of new organic matter by deer in a forest ecosystem is called

Given below are two statements:
Statement $I$: The primary source of energy in an ecosystem is solar energy.
Statement $II$: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity $\text{(NPP)}$.
In the light of the above statements,choose the most appropriate answer from the options given below:

At which of the following levels can Net Primary Productivity $(NPP)$ be obtained?

Assertion : Net primary productivity is gross primary productivity minus respiration.
Reason : Secondary productivity is produced by heterotrophs.

The annual net primary productivity of the whole biosphere is approximately...