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Discuss the gross primary productivity i...

Discuss the gross primary productivity is more efficient than net primary productivity. 

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The gross primary productivity is the total amount of food energy or carbohydrate or biomass produced in an ecosystem by autotrophs, whereas net primary productivity is the proportion of energy after respiration loss in the plant. Therefore gross productivity is more efficient.
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Define net primary productivity.

Define primary productivity .

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Read the given statements and select the correct option. Statement 1: Net primary productivity is less than the gross primary productivity. Statement 2 : Net primary productivity is equal to the gross primary productivity minus the respiration losses.

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Primary productivity depends upon

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Match column I with column II and select the correct option from the given codes. {:("column I","Column II"),("Gross primary productivity",(i)"Self-sustainable"),("Net primary productivity",(ii)"Aquatic ecosystem"),("Pond",(iii)O_(2)"requiring process"),("Aquarium",(iv)"Photosynthetic production"),("Decompositon",(v)"Available to secondary consumers"):}

How Net Primary Productivity can be derived?

Identify the factor that does not affect the primary productivity.