Question

Gross primary productivity of an ecosystem is estimated in terms of ______________.

• A. C g/m$^2$/day
• B. C g dry wt./unit area
• C. Chl/g dry wt./m$^2$/day
• D. Chl/g dry wt./unit area

Hint:

GPP>NPP because some energy is lost in respiration.

Answer 1

The Correct Option is C

Step 1: Understanding gross primary productivity (GPP).
GPP is the rate at which producers fix energy through photosynthesis.
Step 2: Basis of measurement.
It is related to photosynthetic activity and chlorophyll content of producers.
Step 3: Correct unit.
Hence, GPP is expressed in terms of chlorophyll per unit dry weight per unit area per day.
Step 4: Conclusion.
Therefore, option (C) correctly represents the unit of GPP.