A) plant and animal
B) air and \[{{\text{H}}_{\text{2}}}\text{O}\]
C) soil and light
D) biotic and abiotic component
Correct Answer: D
Solution :
Ecosystem comprises the biotic community and the non-living environment. [a] Abiotic components: These include air, water, soil and the basic elements and compounds of the environment. These non-living substances enter the body of living organsims, take part in metabolic activities and then return to the environment. [b] Biotic components: From the nutritional point of view an ecosystem has autotrophic and heterotrophic components. Green plants algae and photosynthetic organisms are autotrophic whereas the animals, fungi etc., are heterotrophic.
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