Why does the stem bend towards light in phototropism?
Answer and explanation
Correct answer: More growth occurs on the shaded side
Phototropism is a growth response controlled by unequal distribution of auxin. When light comes from one side, more auxin collects on the shaded side of a shoot. Cells there elongate more than cells on the illuminated side, so the stem curves toward the light. Thus option A is correct. The other choices describe neither the cause of bending nor the actual response of a shoot.
Frequently asked questions
What is the correct answer to this question?
More growth occurs on the shaded side
Why is this the correct answer?
Phototropism is a growth response controlled by unequal distribution of auxin. When light comes from one side, more auxin collects on the shaded side of a shoot. Cells there elongate more than cells on the illuminated side, so the stem curves toward the light. Thus option A is correct. The other choices describe neither the cause of bending nor the actual response of a shoot.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
