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
(i) response of plant to sunlight?
(ii) bending of stem of plant towards sunlight?
(iii) bending of root of plant away from sunlight?
(b) Name the plant hormone which makes the plant respond to sunlight.
Answers
Answer:
a)
(1) Phototropism
(2)heliotropism or positive Phototropism
(3) negative Phototropism
(b)Auxin
(a)
i) Response of plant to sunlight- Phototropism
ii) Bending of stem of plant towards sunlight-Phototropism
iii) Bending of root of plant away from sunlight -Geotropism
(b) Auxin
Explanation:
(a)Term is used to indicate
(i) Response of plant to sunlight - Phototropism (the orientation of a plant or other such organism in response to light or the light source )
(ii) Bending of stem of plant towards sunlight - Phototropism
(iii) Bending of root of plant away from sunlight - Geotropism (the growth of the parts of plants in response to the force of gravity)
(b) Auxin is the plant hormone which makes the plant respond to sunlight and it improves cell elongation as well.
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