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Class 12
BIOLOGY
Why is the length of a food chain in an ...

Why is the length of a food chain in an ecosystem generally limited to 3-4 trophic levels?

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Text Solution

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As 90% energy is lost in the form of heat from one trophic level to another, residual energy decreases drastically within 2-3 trophic levels.
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Explore conceptually related problems

Consider the following statements conerning food chains (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) Removal of most of the carnivores resulted in an increased population of deers (iii) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss (iv) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?

What will be the amount of energy available to the organisms of the 2^(nd) trophic level of a food chain, if the energy available at the first trophic level is 10,000 joules ?

Knowledge Check

  • Consider the following statements concerning food chains (i) removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) removal of most of the carnivores resulted in an increased population of deers (iii) the length of food chains is generally limited to 3-4 trophic levels due to energy loss (iv) the length of food chains may very from 2 to 8 trophic level Which two of the above statement are correct?

    A
    ii and iii
    B
    iii and iv
    C
    I and iv
    D
    I and ii

  • Consider the following statements concerning food chains (i) removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) removal of most of the carnivores resulted in an increased population of deers (iii) the length of food chains is generally limited to 3-4 trophic levels due to energy loss (iv) the length of food chains may very from 2 to 8 trophic level Which two of the above statement are correct?

    A
    ii and iii
    B
    iii and iv
    C
    I and iv
    D
    I and ii

  • A food chain can have trophic levels

    A
    four
    B
    three
    C
    two
    D
    one

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    OSWAAL PUBLICATION-ECOSYSTEM-TOPIC-2 : Energy Flow and Ecological Pyramids (Short Answer Type Questions-I)
    1. The number of trophic levels in an ecosystem is limited. Comment.

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    5. Write a note on detritus food chain.

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    8. Why is the length of a food chain in an ecosystem generally limited to...

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    9. Differentiate: detritus and grazing food chains.

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    12. Some organisms are called top carnivores. Why? Give some examples.

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