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How is coiling of a tendril around a support evidence of unequal growth after touch?

Answer and explanation

Correct answer: Growth on the touched and opposite sides becomes different

The governing concept is thigmotropism, a directional growth response to touch. When a tendril contacts a support, growth on its two sides becomes unequal. The side away from the support generally elongates more, while the contacted side grows less, causing the tendril to curve and coil around the support. Thus option A correctly explains the evidence. A spinal cord, blood pumping, and thyroxine production are animal functions and cannot account for this plant movement.

Related tags

TendrilThigmotropismTouch ResponseControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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