A plant receives light from one side, and its stem bends towards that side. What is the most accurate role of auxin?
Answer and explanation
Correct answer: Auxin causes greater growth on the shaded side, bending the stem towards light
This is positive phototropism controlled by unequal auxin distribution. Light from one side causes more auxin to accumulate on the shaded side of the shoot. In a stem, that higher auxin concentration promotes greater cell elongation there. The shaded side therefore grows faster and the stem curves toward the light, making option A correct. The other choices describe biologically unrelated or false effects.
Frequently asked questions
What is the correct answer to this question?
Auxin causes greater growth on the shaded side, bending the stem towards light
Why is this the correct answer?
This is positive phototropism controlled by unequal auxin distribution. Light from one side causes more auxin to accumulate on the shaded side of the shoot. In a stem, that higher auxin concentration promotes greater cell elongation there. The shaded side therefore grows faster and the stem curves toward the light, making option A correct. The other choices describe biologically unrelated or false effects.
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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