MCQ Solution: The Living World
Assertion : "Touch" responses in Mimosa is an example of such movement.
Reason : Nastic movements occur in the direction of stimulus.
1) If both the assertion and reason are true and the reason is a correct explanation of the assertion
2) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3) If the assertion is true but the reason is false
4) If both the assertion and reason are false
Solution
Nastic movements are non-directional movements in which the response is determined by the structure of the responsive organ and not the direction of the stimulus.
Touch responses in Mimosa are an example of movements that do not necessarily occur towards or away from the stimulus.
The movement is produced due to turgot changes in the cells of pulvinus or swollen area lying at the base of the petiole, pinnae and pinnules.
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