Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Seedling moisture controls
A student investigated the effect of gravity on the growth of bean seedlings. Figure 6 shows the stationary apparatus A and slowly rotating apparatus B, with the bean seedlings surrounded by damp blotting paper.
What are two reasons for surrounding the seedlings with damp blotting paper? Tick (✓) two boxes.
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Marking points
- 1 Selects 'To prevent water affecting the direction of root growth'.
- 2 Selects 'To provide enough water for root growth'.
Why this answer loses marks
Damp paper only stops the seedlings drying out.
That covers water supply but misses why even moisture must not direct root growth.