A) , trees and weeds
B) plants and animals
C) man and plants
D) biotic and abiotic
Correct Answer: D
Solution :
An ecosystem has two major components ie, abiotic and biotic component. The abiotic component includes the amount of inorganic substances as P, S, C, N, H etc.,, the amount and distribution of inorganic chemicals such as chlorophyll etc, and the climate of given region. The biotic component includes the living organisms of the ecosystem. They include autotrophic components (green plants) and heterotrophic components (herbivores carnivores and decomposers). The tree, weeds and plants are included under autotrophic components whereas the men and animals under hetrotrophic components.
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