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When light falls on a shoot from one side, auxin diffuses towards the shady side, causing that side to:

Question
When light falls on a shoot from one side, auxin diffuses towards the shady side, causing that side to:
Grow longer than the illuminated side, making the shoot bend towards light
Grow shorter, making the shoot bend away from light
Stop growing entirely
Turn brown
Answer
Grow longer than the illuminated side, making the shoot bend towards light
Detailed Explanation
Increased auxin concentration on the shady side stimulates greater cell elongation there, causing the shoot to bend towards the light source.
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