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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.

Related tags

AuxinPhototropismStem GrowthControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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