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प्रश्न
Differentiate phototropism from photonasty.
उत्तर
| Sr. No. | Phototropism | Photonasty |
| 1. | The unidirectional movement of a plant part to light stimulus is called phototropism. It is slow and irreversible. | The non-directional movement of a plant part in response to light is called photo nasty. It is immediate, temporary and reversible. |
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संबंधित प्रश्न
What is the stimulus in geotropism?
Give the scientific terms used to represent the Growing of roots towards the earth.
Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?
What is meant by positive phototropism and negative phototropism? Give one example of each type.
A big tree falls in a forest but its roots are still in contact with the soil.
The branches of this fallen tree grow straight up (vertically). This happens in response to ______.
Higher Order Thinking Skill.
There are 3 plants A, B and C. The flowers of A open their petals in bright light during the day but closes when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but closes during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
- Name the phenomenon shown by the flowers of plant A and B.
- Name one plant each which behaves like the flowers of plant A and B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name the plant which behaves like the leaves of plant 'C'?
The movement of sunflower in accordance with the path of sun is due to
Give an example of negative hydrotropism.
Name the phenomenon occurring in plants which are under the control of gravity, water and chemicals with one example each that shows the movement involved.
The diagram given alongside shows a type of tropism. Study the same and answer the questions that follow:
- Name and define the type of tropism shown in the diagram.
- Label the guidelines (1) to (4).
- Name two effective stimulants that help in the growth of part (2).
- Name two groups of plants where part (2) grows towards gametophyte with the help of the stimulants mentioned in (c).
