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प्रश्न
The bending of the root of a plant away from a source of light is caused by a plant hormone called :
(a) cytokinin
(b) gibberellin
(c) abscisic acid
(d) auxin
उत्तर
(d) auxin
The plant hormone auxin is responsible for negative phototropism in roots.
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संबंधित प्रश्न
Name the type of chemical substances that control the growth in plants.
What is a plant hormone? Name four plant hormones. State one function of each.
To which directional stimuli do shoots respond?
One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :
(a) gibberellin
(b) eltroxin
(c) cytokinin
(d) auxin
Which of the following acts as a stimulus in the process of hydrotropism?
(a) hydrocarbon
(b) hydrogen oxide
(c) hydrogen chloride
(d) hydrogen peroxide
The plant part which exhibits negative geotropism is ______.
Heliotropism is a kind of ______.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Give an example for the movement of plant part which is very quick and can be observed easily.
Name the stimulus which causes the following movement in plant:
Geotropism
