Light condition Bubble moved (mm in 5 min) Darkness 2 Dim light 6 Bright light 11 The table records how far an air bubble moves in a potometer under differe...

Assessment: Biology 0610 | Paper 2 Mock 01 | Multiple Choice (Extended) Subject: Biology - 0610

Question 1 Report

Light conditionBubble moved (mm in 5 min)
Darkness2
Dim light6
Bright light11

The table records how far an air bubble moves in a potometer under different light conditions in 5 minutes. The data show that transpiration is fastest...

Answer Details

Light causes the guard cells to open the stomata, so more vapour can diffuse out and transpiration speeds up. The table shows the bubble moving furthest in bright light (11 mm) compared with dim light (6 mm) and darkness (2 mm), confirming that transpiration is fastest in bright light. In darkness the stomata tend to close, which is why the rate there is lowest.

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