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Plant movements
Concepts tested here
- Tropic movements
All Questions
2010 AIPMT-PRE 1 question
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Coiling of garden pea tendrils around any support is an example ofA tropism is a directional growth movement of a plant part in response to a unidirectional external stimulus.
When the stimulus is touch or contact, the movement is thigmotropism: the side of the tendril in contact with the support grows more slowly than the opposite side, so the tendril coils around the support.
A nastic movement (thigmonasty) is non-directional, e.g., the folding of $Mimosa$ leaves on touch.
Taxis is the movement of a whole organism or cell towards or away from a stimulus, which does not apply to a tendril.
Hence the coiling of pea tendrils is an example of thigmotropism.