Question

why the number of trophic levels in a food chains is limited​

Answer 1

As we move higher up in the food chain the amount of energy diminishes to a level at which it cannot sustain any trophic level, thereby limiting the number of trophic levels

Answer 2

In an ecosystem, the number of trophic levels is limited as they cannot be more than 3 to 4 trophic levels. This is because the "amount of energy flow" decreases with the successive trophic level.

its the answer....