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Pyramid of Biomass in Aquatic Ecosystems

Which one of ...

Question

Which one of the following statements for the pyramid of energy is incorrect?

A

It shows energy content of different trophic level of organisms

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B

It is inverted in shape

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C

It is upright in shape

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D

Its base is broad

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Solution

The correct option is B It is inverted in shape
The pyramid of energy is always upright because producers are more in number and biomass than the herbivores and hence produce more energy. Pyramid of energy is always upright and can never be inverted, because when energy flows from a trophic level to the next trophic level some energy is always lost as heat at each step (10 percent law).

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Q. Read the following statements regarding ecological pyramids and choose the correct answer.
(a) Relationship between organisms at different trophic levels is expressed in terms of number, biomass and energy.
(b) Any calculations of energy content, biomass or number has to include one group of organisms at that trophic level.
(c) In most ecosystems, all the pyramids of number, biomass and energy are upright.
(d) The pyramid of biomass in sea is generally inverted.
(e) Pyramid of energy is always inverted and can never be upright.

Q. An ecological pyramid shows the relationship of biomass, productivity or energy at different trophic levels. Consider the following statements about ecological pyramidsWhich of the above statement(s) is/are NOT correct?

Only 1 & 2
Only 2 & 3
Only 1 &3
None of these

Q. Select the correct statements regarding the pyramids of ecosystem
(A) The pyramid of number of a tree ecosystem is inverted
(B) Pyramid of biomass in sea is inverted
(C) Pyramid of energy is mostly upright except in one special case
(D) Pyramids do not properly account the species belonging to two or more trophic levels

Q. Assertion :Pyramid of energy may be upright or inverted. Reason: Only 20% of energy goes to next trophic level.

Q. Short / Long Answer Type Questions :
(a) Why is pyramid of energy always upright? Explain. Mention the limitations of an ecological pyramid
(b) Construct a pyramid of biomass starting with phytoplanktons. Label three trophic levels. Is the pyramid upright or inverted ? Why?

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Pyramid of Biomass in Aquatic Ecosystems

Standard XII Biology

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