Answer :

A. Correct Statement: Carnivores occupy the third or top trophic level. Its depend on the nature of the food chain look at the examples:

In the above food, chain carnivore occupies top trophic level.

In the above food chain carnivores occupies third and top trophic levels.

B. Correct Statement: The flow of energy in an ecosystem is considered to be a ‘one way’ transport.


Sun is the only source of energy in the ecosystem. The energy in the ecosystem is flowed only in one direction. The energy from the sun is used by the plants to make food through photosynthesis. The energy from plants is then passed on from one organism to another in a food chain and it never returns to the sun. Thus, energy moves in one way that is from Sun to the plants, then to herbivores and then to carnivores.

C. Correct Statement: Plants in an ecosystem are called producers.

Explanation: Using the sunlight, green plants make food for themselves. Other organisms cannot make their food and depend on green plants for food. Therefore, green plants are the producers of food.

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