Question

Primary productivity is measured in terms of

• A. Kg per $m^2$ per yr
• B. g per $m^2$ per yr
• C. Tonnes per hectare per yr
• D. All correct

Answer 1

The correct option is D

All correct

Energy accumulated by plants (producers) in an ecosystem is called primary production. Primary productivity is the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis. Biomass can be measured in kilograms, grams or tonnes and area can be measured in meters, inches, hectares or even in kilometers. Therefore, first three given options are correct units for measurement of primary productivity.