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Edexcel IAL Biology 5.13 Niche, distribution and abundance

Define the niche in the case, identify the resource or condition separating organisms and connect it to zonation, reduced competition or observed biomass.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • Explain reduced competition when species use different foods or reproductive sites.
  • Interpret biomass differences across environments through habitat suitability.
  • Explain zonation and abundance through niches, competition and tolerance limits.

5.13—Niche, distribution and abundance question 1

[Maximum number: 2]

Lions, giraffes and acacia trees are found on the African Plains.
The diagram shows the energy in the trophic levels that these organisms occupy.

Figure for Question 5.13—Niche, distribution and abundance question 1 — Edexcel A-Level Biology A2

Give the meaning of each of the following terms, using the information in the diagram to illustrate your answer.

Niche

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