If a lake is polluted by $DDT$,its highest concentration will be found in:

At which trophic level are carnivorous plants included?

Fill in the blanks.
$(a)$ Plants are called as . . . . . . because they fix carbon dioxide.
$(b)$ In an ecosystem dominated by trees,the pyramid (of numbers) is . . . . . . type.
$(c)$ In aquatic ecosystems,the limiting factor for the productivity is . . . . . . .
$(d)$ Common detritivores in our ecosystem are . . . . . . .
$(e)$ The major reservoir of carbon on earth is . . . . . . .

Choose the correct sentence regarding the carbon cycle.

Secondary producers are

Maximum absorption of rainfall water is done by