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(C) $1$. Primary productivity is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosy

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Secondary productivity

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(C) $1$. Primary productivity is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis.$2$. Gross primary productivity $(GPP)$ is the total rate of photosynthesis.$3$. Net primary productivity $(NPP)$ is the $GPP$ minus respiration losses $(R)$ by plants $(NPP = GPP - R)$.$4$. Secondary productivity is defined as the rate of formation of new organic matter by consumers (heterotrophs).$5$. Since primary consumers are heterotrophs that consume the biomass produced by primary producers to build their own body mass,the energy stored at their level is termed as secondary productivity.

The rate at which energy is stored at the level of primary consumers is known as:

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