Arrange the following trophic levels of the terrestrial ecosystem in…

The correct answer is Option (4) → (C), (D), (B), (A)

(C) Producers — first. Green plants fix the sun’s energy and make food, so every food chain starts with them.

(D) Primary consumers — second. Herbivores eat the producers.

(B) Secondary consumers — third. Primary carnivores eat the herbivores.

(A) Tertiary consumers — fourth. Animals that eat the primary carnivores sit at this level.

NCERT Extract:
Energy Flow – “All animals depend on plants (directly or indirectly) for their food needs. They are hence called consumers and also heterotrophs. If they feed on the producers, the plants, they are called primary consumers, and if the animals eat other animals which in turn eat the plants (or their produce) they are called secondary consumers. Likewise, you could have tertiary consumers too. Obviously the primary consumers will be herbivores. Some common herbivores are insects, birds and mammals in terrestrial ecosystem and molluscs in aquatic ecosystem. The consumers that feed on these herbivores are carnivores, or more correctly primary carnivores (though secondary consumers). Those animals that depend on the primary carnivores for food are labelled secondary carnivores.”