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2 marksTransport Systems

CSEC Biology · May/June 2019 · Paper 2 · Question 1(a)(iii)

Apparatus is set up to measure the rate of transpiration of a potted plant located in a room beside an open window over a 12-hour period. The apparatus includes a well-watered plant, a tightly sealed polythene bag enclosing the pot and soil, and a beam balance.

Suggest TWO factors that may affect the rate of transpiration of the potted plant.

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Other parts of this question

  1. 1(a)(i)Describe the procedure that uses the apparatus shown in Figure 1 to investigate the rate of transpiration of the potted plant within the 12-hour period.[4 marks]
  2. 1(a)(ii)State ONE precaution that should be taken to ensure that the results are accurate.[1 mark]
  3. 1(b)(i)Draw a suitable table and record the results presented in the graph in Figure 2.[4 marks]
  4. 1(b)(ii)During what time period was the rate of transpiration highest?[1 mark]
  5. 1(b)(iii)Suggest TWO reasons for the shape of the graph during EACH of the following time periods: 6 a.m. to 8 a.m., 9 a.m. to 11 a.m., 12 noon to 2 p.m.[6 marks]
  6. 1(c)(i)Discuss how transpiration helps plants to move water from their roots to their leaves.[3 marks]
  7. 1(c)(ii)While absorbing water from the soil, plants absorb mineral salts such as magnesium, calcium and nitrogen. State ONE role of magnesium and ONE role of calcium…[2 marks]
  8. 1(c)(iii)Nitrogen is used by plants to make protein. Suggest TWO reasons why plants need protein.[2 marks]

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