Gross Primary Productivity

Q.

Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

1. Secondary productivity

2. Tertiary productivity

3. Gross primary productivity (GPP)

4. Net primary productivity (NPP)

Q. In an ecosystem the rate of formation of organic matter during photosynthesis is termed as :

1. Net primary productivity
2. Net productivity
3. Gross primary productivity
4. Secondary productivity

Q. Gross primary productivity is the rate at which organic matter is synthesised by producers per unit area and time.

1. True
2. False

Q.

The rate at which light energy is converted into chemical energy in ecosystems:

1. Net secondary productivity

2. Gross secondary productivity

3. Gross primary productivity

4. Net primary productivity

Q.

Assertion: The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity
Reason: Gross primary productivity is the rate at which consumers convert the chemical energy of their food into their own biomass

1. Both assertion and reason are true and the reason is the correct explanation of assertion

2. Both assertion and reason are true but the reason is not the correct explanation of assertion

3. Assertion is true but the reason is false

4. Assertion and reason are false