A) consumer organisms
B) secondary consumer organisms
C) sunlight, green plants
D) decomposer organisms.
Correct Answer: C
Solution :
: Biosphere consists of several life supporting habitats termed as ecosms or ecosystems. An ecosystem has producers (plants), consumers (animals) and decomposers constituting the biotic component, and life supporting matter and energy which constitute the abiotic component. Stability of ecosystem depends on- (i) Fixation and transfer of energy (i.e. sunlight is essential). (ii) Conversion of abiotic components (nutrients and energy) into organic structures (i.e., green plants are essential).
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