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12.Ecosystem
medium
The amount of organic matter stored by green plants in a unit time and area is called
A
Productivity
B
Net primary productivity
C
Gross primary productivity
D
Primary productivity
Solution
Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume for unit time. It is given by $\mathrm{NPP}=\mathrm{GPP}-\mathrm{R}$ (Gross Primary Productivity) where, $R=$ Respiration losses. It is utilised by hetertrophs
Standard 12
Biology
Similar Questions
Match the columns:
| Column – $I$ | Column – $II$ |
| $(a)$ Saprotrophs | $(i)$ He makes his food |
| $(b)$ Omnivores | $(ii)$ Dependent on dead |
| $(c)$ Autotrophs | $(iii)$ Eat other animals for food |
| $(d)$ Vegetarian | $(iv)$ Fertilizers for plants |
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