Question

Heterotrophic plants occupy which trophic level in food chain? Why?

Answer 1

heterotrophic plants occupy second trophic level or more than the second trophic level because they feed on food produced by other organisms

Answer 2

Heterotrophs are animals hat feed on other plants and animals for their survival. In a food chain, fist comes the autotrophs which prepare their own food, followed by heterotrophs.

So, the level of heteroptrophs in a food chain is secondary. Their survival without the primary organisms (autotrophs) is not possible.