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Question
Differentiate between:
Phototropism and chemotropism
Solution
| Phototropism | Chemotropism | ||
| 1. | Directional growth movement of a plant part in response to light. | 1. | Directional growth movement of a plant part in response to chemicals. |
| 2. | Example: Growth of plant shoots in an upward direction. | 2. | Example: Growth of pollen tube towards female gametophyte |
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RELATED QUESTIONS
To which directional stimuli do roots respond?
Tendrils wind around a support in response to ______.
What is meant by 'tropisms' (or tropic movements)? Explain with an example.
Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?
(a) thigmotropism
(b) chemotropism
(c) hydrotropism
(d) geotropism
The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :
(a) chemotropism
(b) nastic movement
(c) thigmotropism
(d) geotropism
There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them 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 (i) plant A and (ii) plant B.
- Name one flower each which behaves like the flower of (i) plant A and (ii) plant B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name a plant whose leaves behave like those of plant C.
- Which plant/plants exhibit the phenomenon based on growth movements?
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 |
The movement of sunflower in accordance with the path of sun is due to
Thigmonasty can be seen in ______.
What does a Mimosapudica plant do in response to touch? What is the phenomenon known as?
