Match List I with List II:

| List-I | | List-II | |
|---|---|---|---|
| A. | Productivity | I. | Gross primary productivity minus respiration losses |
| B. | Net primary productivity | II. | Rate of formation of new organic matter by consumers |
| C. | Gross primary productivity | III. | Rate of biomass production |
| D. | Secondary productivity | IV. | Rate of production of organic matter during photosynthesis |

Choose the correct answer from the options given below:

Question

Match List I with List II:

| List-I | | List-II | |
|---|---|---|---|
| A. | Productivity | I. | Gross primary productivity minus respiration losses |
| B. | Net primary productivity | II. | Rate of formation of new organic matter by consumers |
| C. | Gross primary productivity | III. | Rate of biomass production |
| D. | Secondary productivity | IV. | Rate of production of organic matter during photosynthesis |

Choose the correct answer from the options given below:

Accepted Answer

A. 1. **Define Productivity**: it simply refers to the **rate of biomass production** in an ecosystem.
So A matches with **III**.

2. **Define Gross Primary Productivity (GPP)**: this is the rate at which producers make organic matter through photosynthesis.
So C matches with **IV**.

3. **Define Net Primary Productivity (NPP)**: since producers also use up some of this energy in their own respiration, the leftover amount is the NPP.
$$
NPP = GPP - R
$$
So B matches with **I**.

4. **Define Secondary Productivity**: this is the rate at which **consumers** (not producers) form new organic matter by consuming other organisms.
So D matches with **II**.

Hence, the correct matching is A-III, B-I, C-IV, D-II, so the answer is **A**.

List-I		List-II
A.	Productivity	I.	Gross primary productivity minus respiration losses
B.	Net primary productivity	II.	Rate of formation of new organic matter by consumers
C.	Gross primary productivity	III.	Rate of biomass production
D.	Secondary productivity	IV.	Rate of production of organic matter during photosynthesis