A) Only plants
B) Only animals
C) Only carnivores
D) Organisms linked in food chains
Correct Answer: D
Solution :[d] In an ecosystem, energy producing substances produced by autotrophs are the sources of food for heterotrophic organisms. A typical example being plant eaten by an animal. This animal may in turn be eaten by another animal. In this way, energy is transferred from one organism to another, each feeding on the proceeding organism 'and providing raw materials and energy for the next organism. This series or sequence is called food chain. Each stage of the food chain is known as trophic level.
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