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.
Frequently asked questions
What is the correct answer to this question?
The first is a rapid non-growth movement and the second is a directional growth movement
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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