Select the correct statement about productivity from the following.

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Gross primary productivity is the available biomass for the consumption to heterotrophs.

Secondary productivity depends on the photosynthetic capacity of the plant species inhabiting a particular area.

Of an approximate NPP of 170 billion tonnes, the productivity of the oceans are only 55 billion tons despite accupying 70% of the earth.

Productivity is expressed in terms of kg^-2yr^-1 or (kcalm^-2)yr^-1 to compare the productivity of different ecosystems.

answer is D.

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Detailed Solution

The rate of biomass production is called productivity. It is expressed in terms of g^-2yr^-1 or (kcalm^-2)yr^-1 to compare the productivity of different ecosystems. It can be divided into gross primary productivity (GPP) and net primary productivity (NPP).

Net primary productivity is the available biomass for the consumption to heterotrophs (herbiviores and decomposers).

Primary productivity depends on the plant species inhabiting a particular area. It also depends on a variety of environmental factors, availability of nutrients and photosynthetic capacity of plants. Therefore, it varies in different types of ecosystems. 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 per cent of the surface, the productivity of the oceans are only 55 billion tons.

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