Question
Distinguish between :
Primary and secondary productivity
Primary and secondary productivity
✓
Answer
| S.No. | Primary Productivity | Secondary Productivity |
| 1. | Green plants are primary producers. The rate of production of the amount of organic matter produced per unit area in a given time period is called primary productivity. It is expressed in terms of $gm ^{-2} yr ^{-1}$ or $KCal m ^{-2} yr ^{-1}$. It refers to the productivity at the producer level. | 1. The rate of the synthesis of new organic matter by consumers is defined as secondary productivity. It refers to the productivity at the consumer level. |
| 2. | Primary productivity is of two types: Gross Primary Productivity and Net Primary Productivity. GPP - R = NPP ( R= Loss in respiration) | 2. Secondary productivity is of two types: Gross Secondary Productivity and Net Secondary Productivity GSP - R = NSP ( R= Loss in respiration) |
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