Assertion: The annual net primary productivity of the whole biosphere is approximately 170 million tons (dry weight ) of organic matter.
Reason: Of this, despite occupying about 70 percent of the surface, the productivity of oceans are only 55 million tons.

Options

A. If both assertion and reason are true and the reason is a correct explanation of the assertion.
B. If both assertion and reason are true but reason is not a correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

D

Explanation

`*` The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.
`*` Of this, despite occupying about 70 percent of the surface, the productivity of oceans are only 55 billion tons.