If auxin distribution remains equal on both sides, why can bending of the stem in one direction decrease?
Answer and explanation
Correct answer: Because growth on both sides will be nearly equal
The governing concept is phototropism, in which unequal auxin distribution causes unequal cell elongation on the two sides of a stem. The side with greater elongation becomes longer and the stem bends toward the side with less growth. If auxin remains equally distributed, elongation on both sides is nearly equal, so the growth difference and resulting bending decrease. Therefore option A is correct; the other options describe biologically impossible changes unrelated to auxin-controlled growth.
Frequently asked questions
What is the correct answer to this question?
Because growth on both sides will be nearly equal
Why is this the correct answer?
The governing concept is phototropism, in which unequal auxin distribution causes unequal cell elongation on the two sides of a stem. The side with greater elongation becomes longer and the stem bends toward the side with less growth. If auxin remains equally distributed, elongation on both sides is nearly equal, so the growth difference and resulting bending decrease. Therefore option A is correct; the other options describe biologically impossible changes unrelated to auxin-controlled growth.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
