How does auxin help in phototropism in a stem?
Answer and explanation
Correct answer: By increasing cell elongation on the shaded side
Phototropism is the directional growth of a plant part in response to light. When light comes from one side, auxin becomes concentrated more on the shaded side of a young stem. In shoots, this promotes greater cell elongation there than on the illuminated side. The unequal growth produces curvature, causing the stem to bend toward light. Hence, option A is correct.
Frequently asked questions
What is the correct answer to this question?
By increasing cell elongation on the shaded side
Why is this the correct answer?
Phototropism is the directional growth of a plant part in response to light. When light comes from one side, auxin becomes concentrated more on the shaded side of a young stem. In shoots, this promotes greater cell elongation there than on the illuminated side. The unequal growth produces curvature, causing the stem to bend toward light. Hence, option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
