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Paper 1 H - SAMPLE SET 1 Q18 Answers

18) Emma wants to investigate the effect of air movement on transpiration.
​The diagram shows how she sets up her experiment.
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Emma measures the rate of transpiration by measuring the loss in mass over 3 hours.
She does this first with the fan switched off.
She then repeats this but with the fan switched on.
She keeps all other environmental conditions the same.
​These are her results.
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(a) Explain the difference in her results. [2]

(b) Emma kept environmental conditions like light intensity and temperature the same.

(i) Why was it important to keep the light intensity the same? [2]

(ii) Why was it important to keep the temperature the same? [1]

​(Total for Question 18 = 5 marks)

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