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4 marksPhotosynthesis and Energy Flow

CSEC Human and Social Biology · May/June 2012 · Paper 2 · Question 2(a)(iv)

Mark observes organisms on a reef while snorkeling.

Account for the differences in available energy at the different trophic levels of the food chain.

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Other parts of this question

  1. 2(a)(i)Construct an aquatic food chain using three organisms found on reefs.[2 marks]
  2. 2(a)(ii)Identify a herbivore from the constructed food chain in (a)(i).[1 mark]
  3. 2(a)(iii)State which trophic level of a food chain (first, second or third) has the HIGHEST number of species.[1 mark]
  4. 2(b)Fill in the blanks to complete the statements distinguishing an organism that lives in or on another host from one that feeds by capturing and killing prey.[2 marks]
  5. 2(c)Provide the equation for photosynthesis, and using the information in Figure 4, explain why getting rid of all trees, plants, and grass everywhere is not a…[5 marks]

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