In the carbon cycle,the source of carbon for plants is:

Which one of the following is not a functional unit of an ecosystem?

Which one of the following is not a function of an ecosystem?

$Mr. X$ is eating curd. What is his trophic level in the food chain for this food?

Herbivores are called

Which of the following statements are correct?
$(a)$ Net primary productivity is available biomass for consumption to heterotrophs.
$(b)$ Secondary productivity is defined as the rate of formation of new organic matter by heterotrophs.
$(c)$ The annual net primary productivity of the ocean is greater than that of land.
$(d)$ Warm and moist environment favours decomposition.