In a food chain the second trophic level is occupied by _______. (a) carnivores (b) autotrophs (c) herbivores (d) producers

The second trophic level in a food chain is occupied by (c) herbivores.

Here's the step by step explanation:

1. The first trophic level in a food chain is occupied by producers or autotrophs. These are typically plants or algae that produce their own food through photosynthesis.

2. The second trophic level is occupied by organisms that consume the producers. These are known as primary consumers or herbivores. They eat plants and other producers to get energy.

3. The third trophic level is occupied by secondary consumers or carnivores. These organisms eat the herbivores.

So, the correct answer to your question is (c) herbivores.