Why does a plant bend towards light if auxin collects more on the shaded side of the stem?
Answer and explanation
Correct answer: Cells on the shaded side elongate more, making the stem bend towards the light
The governing concept is auxin-controlled phototropism. In a young shoot, auxin collecting on the shaded side promotes greater cell elongation there than on the illuminated side. Because one side becomes longer, the stem curves towards the light, making option A correct. Immediate cell death, pulling by roots and spinal-cord signalling are not explanations for plant phototropic bending.
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What is the correct answer to this question?
Cells on the shaded side elongate more, making the stem bend towards the light
Why is this the correct answer?
The governing concept is auxin-controlled phototropism. In a young shoot, auxin collecting on the shaded side promotes greater cell elongation there than on the illuminated side. Because one side becomes longer, the stem curves towards the light, making option A correct. Immediate cell death, pulling by roots and spinal-cord signalling are not explanations for plant phototropic bending.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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