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Question
Which of the following shows photonastic movement?
Which of the following shows photonastic movement?
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Solution
The correct option is D Oxalis triangularis
The non-directional movement of a plant part, usually the petals of flowers, in response to light is called photonastic movement. For example, leaves of Oxalis triangularis open in bright light and droop in dim light. Thermonastic movements in plants occur due to the change in temperature. Flowers of a plant open with the rise in temperature and close with a drop in temperature. The drooping of leaflets of some plants and closing of flowers such as hibiscus, tulips, poppies and crocuses in the evening is called nyctinastic movement. Whereas Mimosa pudica also called the sensitive plant shows thigmonasty, the nastic movement of plant parts in response to touch.
Oxalis triangularis
The non-directional movement of a plant part, usually the petals of flowers, in response to light is called photonastic movement. For example, leaves of Oxalis triangularis open in bright light and droop in dim light. Thermonastic movements in plants occur due to the change in temperature. Flowers of a plant open with the rise in temperature and close with a drop in temperature. The drooping of leaflets of some plants and closing of flowers such as hibiscus, tulips, poppies and crocuses in the evening is called nyctinastic movement. Whereas Mimosa pudica also called the sensitive plant shows thigmonasty, the nastic movement of plant parts in response to touch.
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