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Why food chains have only three to five trophic levels

The same question, asked 4 times: 2022*, 2023*, 2024*, 2026. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2022

    9
    What are trophic levels ? Why are autotrophs considered to be at the first trophic level of all food chains ? State the reason for limited number of trophic levels in nature.

  2. Question 2

    2023

    33
    (a) Write the percentage of (i) solar energy captured by the autotrophs and (ii) energy transferred from autotrophs to the next level in a food chain. (b) What are trophic levels ? Why do different food chains in an ecosystem not have more than four to five trophic levels ? Give reason.

  3. Question 3

    2024

    26
    Give reasons for the following : (a) Food web is more stable than a food chain in an ecosystem. (b) A food chain should not have more than four to five trophic levels.

  4. Question 4

    2026

    11
    Explain why food chains generally consist of three or four steps.