Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Control root appearance comparison
Figure 6 is repeated below. The student left both sets of apparatus in a dark cupboard for 24 hours.
In Question 04.4, Figure 7 was completed to show the root of a seedling from apparatus A after 24 hours.
Describe how a root from apparatus B would look different from the root you drew in Question 04.4.
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Marking points
- 1 States that B's root would remain horizontal/straight rather than bending.
Full-mark answer
The root in apparatus B would grow straight out horizontally rather than bending downward.
Why this answer loses marks
The rotating root bends upward.
Rotation removes a fixed directional stimulus, so the credited contrast is no bending rather than a reversed bend.