Question

Primary productivity can be measured by

• A. Harvest method
• B. Chlorophyll content
• C. Oxygen given out
• D. All of the above

Answer 1

The correct option is D All of the above

Several methods are used in measurement of productivity or rate of production. Harvest method measures the productivity of a water body, such as fish pond by harvest at the end of the season. The productivity given is secondary productivity and indicates net productivity.

Primary productivity can be measured from the amount of oxygen consumed by a volume of water in a fixed period of time. This oxygen production indicates net primary productivity only. Primary production can also be measured by determining the amount of functional chlorophyll present. Chlorophyll is extracted with acetone and determined spectrophotometrically or fluorometrically.