Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

The graph presents the findings from a potometer used to investigate how wind speed affects the rate of water loss in a plant. Which statement accounts for the results of the investigation?

  • AAs wind speed increases, it becomes harder for the plant to obtain carbon dioxide. At high wind speeds the stomata are fully open so rate of water loss is high.
  • BAs wind speed increases, moist air around the stomata is removed and replaced by dry air. At high wind speeds the transpiration rate is lower.
  • CAs wind speed increases, the rate of water loss increases due to an increased diffusion gradient. At high wind speeds, the stomata close.
  • DAs wind speed increases, transpiration rate and rate of photosynthesis increases. At high wind speeds more water is used for photosynthesis.

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