NEET 2020
- Exam
- NEET
- Year
- 2020
- Subject
- Botany
- Chapter
- Ecosystem
NEET 2020 · Botany · Ecosystem
In relation to Gross primary productivity and Net primary...
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
Options
- AGross primary productivity is always more than net primary productivity
- BGross primary productivity and Net primary productivity are one and same
- CThere is no relationship between Gross primary productivity and Net primary productivity
- DGross primary productivity is always less than net primary productivity
Correct answer
A. Gross primary productivity is always more than net primary productivity
Step-by-step solution
Gross primary productivity (GPP): It is the rate of production or synthesis of organic matter by producers during photosynthesis per unit time and area. A considerable amount of GPP is utilized by plants in respiration.
Net primary productivity (NPP): Gross primary productivity minus respiration losses (R).
NPP = GPP – R
Net primary productivity is the available biomass for the consumption of heterotrophs i.e., both herbivores and decomposers.