Explanation:
Secondary productivity is the rate of biomass formation or energy fixation by heterotrophic organisms, such as grazers and decomposers. These derive all their energy from photosynthetic plants and other autotrophs, either directly or indirectly, and their productivity determines the number of trophic levels and the lengths of the food chains within an ecosystem - both of which are likely to be increased by greater secondary productivity. Secondary productivity is the rate at which the consumers convert the chemical energy of their food into their own biomass is called as secondary productivity. The efficiency at which energy is transferred from one trophic level to another is called as ecological efficiency. On average it is estimated that there is only a 10 percent transfer of energy.
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$(I)$ Idli $(II)$ Dosa
$(III)$ Toddy $(IV)$ Cheese
Reason: Immune system weakens during $HIV$ infection.
| List $I$ | List $II$ |
| $A$. Clostridium butylicum | $1$. Ethanol |
| $B$.Saccharomycescerevisiae | $II$. Streptokinase |
| $C$.Trichodermapolysporum | $III$. Butyric acid |
| $D$. Streptococcus sp. | $IV$.Cyclosporin-$A$ |
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