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1 markPhotosynthesis and Energy Flow

CSEC Human and Social Biology · January 2017 · Paper 2 · Question 2(b)(ii)

Figure 2 displays part of the carbon cycle.

Identify the stage in the carbon cycle where human activities have a major effect.

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Other parts of this question

  1. 2(a)Complete the concept map by stating the correct labels for (i), (ii), (iii), and (iv).[4 marks]
  2. 2(b)(i)Identify the stage in the cycle at which carbon dioxide enters the food chain.[1 mark]
  3. 2(c)(i)State two reasons why plants require adequate amounts of nitrogen.[2 marks]
  4. 2(c)(ii)Name two types of soil bacteria that provide nitrogen.[2 marks]
  5. 2(d)(i)Suggest three pollutants that may run off from the garden into the river.[3 marks]
  6. 2(d)(ii)Outline two effects of these pollutants on living organisms in the aquatic ecosystem.[2 marks]

More practice: the rest of this paper · more Photosynthesis and Energy Flow questions · all CSEC Human and Social Biology past papers