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3 marksEcological Systems, Biodiversity and Conservations

CAPE Biology Unit 2 · May/June 2022 · Paper 2 · Question 1(c)(ii)

An ecosystem contains different species living together in a relatively self-contained area. It has been suggested that species diversity is a driving force in the stability of an ecosystem.

Explain how high species diversity affects the stability of an ecosystem.

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Other parts of this question

  1. 1(a)(i)Define the term 'limiting factor'.[2 marks]
  2. 1(a)(ii)Outline how light intensity is a limiting factor in the process of photosynthesis.[2 marks]
  3. 1(b)(i)State a suitable hypothesis for the investigation.[2 marks]
  4. 1(b)(ii)Identify ONE manipulated variable and ONE responding variable in the investigation.[2 marks]
  5. 1(b)(iii)State ONE variable that should be controlled in the investigation.[1 mark]
  6. 1(b)(iv)Explain how growing lettuce in a greenhouse using a hydroponic system can reduce the effects of ONE limiting factor of photosynthesis.[3 marks]
  7. 1(c)(i)Define the term 'species diversity'.[2 marks]
  8. 1(d)(i)Classify EACH of the following factors as EITHER an abiotic factor or a biotic factor. Ocean currents, The lionfish as predators, The lionfish feeding on…[4 marks]
  9. 1(d)(ii)Explain how any THREE of the factors in (d)(i) influenced the dynamics of the coral reef ecosystem since the invasion of the lionfish.[9 marks]

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