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Why do tendrils of a climber coil around a support?

Answer and explanation

Correct answer: Touch causes unequal growth on the two sides

The governing concept is thigmotropism, a directional growth response to touch. When a tendril touches a support, auxin distribution and cell elongation become unequal on its two sides. The untouched side generally grows more, so the tendril bends toward and coils around the support. Thus option A is correct; the other choices do not explain plant growth movement or involve blood, food production, or complete loss of light.

Related tags

TendrilsThigmotropismPlant MovementControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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