CBSE Class 10 Science 2023 Delhi Set 3

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Question : 4
Total: 10
Name a plant hormone responsible for bending of a shoot of a plant when it is exposed to unidirectional light. How does is promote phototropism?
Solution:  
The plant hormone responsible for the bending of a shoot of a plant when it is exposed to unidirectional light is called auxin. Auxin promotes phototropism by accumulating on the shaded side of the shoot, causing cells on that side to elongate more than cells on the side exposed to light, resulting in the bending of the shoot towards the light source.
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