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Question 30

In this model, a biomass pyramid is drawn for a typical land food web using the total mass of living material at each level. What shape does it usually have?

  1. It narrows going up, with the greatest biomass in the producersBonne réponse
  2. It is a perfect rectangle, with equal biomass at every level
  3. It widens going up, with the greatest biomass in the top predators
  4. It shows biomass for the consumers only and leaves the producers out

Explication

In the typical land food web modelled here the producers hold the greatest mass of living material and each higher level holds less, so the pyramid narrows upward. The rectangle answer fails because equal biomass at every level would contradict the large losses between levels.

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Question 30: In this model, a biomass pyramid is drawn for a typical… · Food Webs and Energy Flow · Questena