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Photoperiodism

A potted plan...

Question

A potted plant kept in a dark room near an open window bends towards the light source. why?

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Solution

Light source acts as a stimulus due to which the stem bends towards the light. This type of movement is known as phototropism.

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Q. A student takes a potted plant growing in a transparent glass jar. This potted plant having straight stem and straight root is kept near the window in a dark room so that sunlight falls on it from the right side (through the window). After some days, it is found that the stem of plant bends towards the right side (from where the light is coming) but the root bends to the left side, away from the light.
(a) What term is used to indicate:
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(iii) bending of root of plant away from sunlight?
(b) Name the plant hormone which makes the plant respond to sunlight.

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