Question

what is photonastic ?​

Answer 1

Answer:

it is the growth of the plant in response to the external stimuli I.e. light

Answer 2

Answer:

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$Photonastic:$

The tendency in certain plant species to respond to light by developing sufficient cellular force or growth on one side of an axis to change the form or position of the axis.

$Example:$

The opening and closing of the flowers of four-o'clocks.