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Question

In a lake ecosystem, the pyramid of biomass is generally.


A

Upright

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B

Horizontal

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C

Inverted

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D

Spindle-shaped

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Solution

The correct option is C

Inverted


The correct option is C.

Explanations of correct option:

Option C:

  1. The inverted pyramid represents the pyramid of biomass in a lake ecosystem.
  2. The inverted pyramid decreases in size from top to bottom.
  3. Hence, this means that there is a gradual increase in the biomass from successive trophic levels from the bottom to the top.

Explanations of incorrect options:

Option A:

  1. Upright pyramid of ecosystems is generally used to represent the grassland and terrestrial ecosystems.
  2. The biomass generally decreases from bottom to top.
  3. Hence, it also shows how energy flow decreases from the bottom to the top, as the reaches the top consumers from the bottom primary consumers.

Option B:

  1. The horizontal bars in an ecological pyramid represent the numbers or amount of energy in a particular trophic level.
  2. There isn't any kind of specific horizontal pyramids.

Option D:

  1. The forest pyramid of numbers is spindle-shaped.
  2. The pattern of the numbers in the pyramid in a particular direction is not uniform.
  3. The number of primary consumers is more than primary producers and secondary consumers (carnivores).

Final answer: In a lake ecosystem, the pyramid of biomass is generally inverted.


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