Which ecosystem exhibits the maximum gross primary productivity?

Match the following columns correctly.

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

Approximately $.............$ of the Earth's surface is covered by oceans,yet the productivity of the oceans is only $...............$.

Which of the following ecosystems has the highest productivity per unit area?

The total rate of photosynthesis,including the organic matter used up in respiration during a definite period,is known as:

State whether the following statements are True or False:
$I.$ The total organic matter synthesized by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity.
$II.$ Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time.