Question

(i) What is primary productivity? Why does it vary in different types of ecosystems?

(ii) State the relation between gross and net primary productivity.​

Answer 1

Here's the Answer

(i)The primary productivity varies in different types of ecosystem as it depends upon different plant species present in a given ecosystem and each of their photosynthetic efficiency. Also, the environmental factors, availability of various nutrients vary in different ecosystems, leading to variations in primary productivity.

(ii) The relationship between gross and net primary productivity can be explained by equation:

GPP- R= NPP

While, GPP is total amount of organic matter produced during photosynthesis and NPP is same amount of organic matter (biomass) for the consumption of heterotrophs, except for some respiratory losses, i.e. energy utilised by plants during respiration.

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