Question: 93. In the equation
\mathrm{GPP}-\mathrm{R}=\mathrm{NPP}GPP is Gross Primary Productivity NPP is Net Primary Productivity R here is \_\_\_\_ .
(1) Respiratory loss
(2) Reproductive allocation
(3) Photosynthetically active radiation
(4) Respiratory quotient
Answer: Option (1)
Explanation:
Gross Primary Productivity represents the total amount of organic matter produced by plants through photosynthesis.
Plants use a part of this produced energy for their own metabolic activities such as growth, maintenance, and repair.
The energy consumed in these metabolic activities is lost as respiration and is represented by \mathrm{R}.
Net Primary Productivity is the remaining biomass after subtracting respiratory loss from Gross Primary Productivity.
This relationship is expressed as \mathrm{NPP}=\mathrm{GPP}-\mathrm{R}.
Therefore, R represents respiratory loss.