If plants (producers) of an ecosystem die,then the system

Select the correct option from the following.

Which of the following is a producer in the plant kingdom?

Which of the following statements is false?

In which trophic level does the Sparrow belong as a consumer?

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 . . . . . . .