Assertion: Net primary productivity is gross primary productivity minus respiration.
Reason: Secondary productivity is produced by heterotrophs.
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Text Solution
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Net primary productivity is the rate of organic matter build up or stored by producers in their bodies per unit time and area. Net productivity is equal to gross primary productivity minus loss due to respiration and other reasons. Rate of increase in energy containing organic matter or biomass by heterotrophs or consumers per unit time and area is known as secondary productivity.
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