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4 marksThe Uptake and Transport of Water and Minerals

CAPE Biology Unit 2 · May/June 2022 · Paper 2 · Question 2(b)(i)

Soil water and other environmental factors, such as light, affect the transpiration rate in plants. Figure 2 shows the influence of four different light intensities on the transpiration rate of the common sage plant. All measurements were conducted at 60 and 75 days after plant installation to the four different light intensities.

Compare the observed differences in transpiration rates at 60 days and 75 days at the highest intensities and lowest intensities.

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Other parts of this question

  1. 2(a)(i)On Figure 1, insert labels to identify THREE different types of root cells.[3 marks]
  2. 2(a)(ii)Insert arrows on Figure 1 to illustrate the direction of water movement from the soil into the different areas of the plant root shown in the diagram.[3 marks]
  3. 2(a)(iii)Describe how water potential facilitates the movement of water from the soil into the plant roots.[2 marks]
  4. 2(b)(ii)Explain the differences between the transpiration rates on a sunny day and at night-time.[3 marks]
  5. 2(c)In the space provided below, draw a diagram of ONE red blood cell and ONE white blood cell shown in Figure 3.[7 marks]
  6. 2(d)Justify why cardiac output increases during peak performance in athletes (80–120 bpm) but decreases when heart rate exceeds 160 bpm.[8 marks]

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