What is the main difference between folding of touch-me-not leaves and coiling of a tendril?
Answer and explanation
Correct answer: Touch-me-not movement is non-growth based while tendril coiling is growth based
The governing concept is that plant movements may be either growth-independent or growth-dependent. Touch-me-not leaves fold rapidly because changes in cell water content and turgor pressure occur at the pulvinus; this is not caused by growth. A tendril coils after touch because unequal growth develops on its two sides. Thus option A is correct. The other options wrongly invoke blood flow, a spinal cord, or unrelated tropisms.
Frequently asked questions
What is the correct answer to this question?
Touch-me-not movement is non-growth based while tendril coiling is growth based
Why is this the correct answer?
The governing concept is that plant movements may be either growth-independent or growth-dependent. Touch-me-not leaves fold rapidly because changes in cell water content and turgor pressure occur at the pulvinus; this is not caused by growth. A tendril coils after touch because unequal growth develops on its two sides. Thus option A is correct. The other options wrongly invoke blood flow, a spinal cord, or unrelated tropisms.
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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