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Folding of touch-me-not leaves and coiling of a tendril are both related to touch. What is the main difference between them?

Answer and explanation

Correct answer: The first is a rapid non-growth movement and the second is a directional growth movement

The governing concept is the difference between nastic movement and tropic growth. Touch-me-not leaves fold rapidly because of changes in cell turgor at the pulvinus; this movement does not require growth and is not direction-dependent. A tendril coils after contact because unequal growth occurs on its two sides, making it a directional thigmotropic response. Therefore option A is correct.

Related tags

Touch Me NotThigmotropismNastic MovementControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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