Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called :
(a) phototropism
(b) thigmonasty
(c) chemotropism
(d) photonasty
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Solution
(d) photonasty
The response of dandelion flowers to light that involves the movement of the petals is an example of photonasty.