Question

Generally, how many trophic levels does a food chain have?

• A. One
• B. Two
• C. Three
• D. Three or four

Answer 1

The correct option is D Three or four

• The length of a food chain in an ecosystem is generally limited to 3-4 trophic levels.
• As 90% of energy is lost in the form of heat from one trophic level to another, residual energy decreases drastically within 2-3 trophic levels.

Therefore, the correct answer is option D.