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प्रश्न
The movement of sunflower in accordance with the path of the sun is due to :
(a) photonasty
(b) phototropism
(c) hydrotropism
(d) chemotropism
उत्तर
(a) photonasty
It is a non-directional movement of plant parts in response to light.
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संबंधित प्रश्न
Where is the auxin hormone made in a plant stem?
Give the scientific terms used to represent the Growth of a pollen tube towards ovule.
Define chemotropism.
The root of a plant grows downward. This is known as ______.
A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:
- Which figure shows the correct position taken by the parts A and B of the plant?
- What type of phenomenon is exhibited by the figure chosen in (a) above?
Match column A with column B.
| Column A | Column B |
| Roots growing downwards into soil. | Positive phototropism |
| Shoots growing towards the light. | Negative geotropism |
| Shoots growing upward. | Negative phototropism |
| Roots growing downwards away from light. | Positive geotropism |
State whether true or false. If false, correct the statement.
The response of a part of plant to the chemical stimulus is called phototropism.
The leaves of Mimosa are sensitive to ____________.
Name a hormone which is responsible for phototropism
Name the stimulus which causes the following movement in plant:
Hydrotropism
