Arrange the given organisms in the food chain starting from lower to…

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

(C) Grass — first. Grass is a green plant that makes its own food by photosynthesis. It is the producer and stands at the first trophic level.

(B) Cow — second. The cow eats grass. It is a herbivore, the primary consumer, at the second trophic level.

(D) Wolf — third. The wolf feeds on herbivores. It is a carnivore, the secondary consumer, at the third trophic level.

(A) Lion — last. The lion is a top carnivore. It stands at the fourth trophic level, and no other animal in this chain feeds on it.

NCERT Extract:
Energy Flow – “… Organisms occupy a place in the natural surroundings or in a community according to their feeding relationship with other organisms. Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level. Producers belong to the first trophic level, herbivores (primary consumer) to the second and carnivores (secondary consumer) to the third (Figure 12.2).”

Figure 12.2 Diagrammatic representation of trophic levels in an ecosystem