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प्रश्न
Differentiate between:
Thigmotropism and geotropism
उत्तर
| Thigmotropism | Geotropism | ||
| 1. | Directional growth movement of a plant part in response to the touch of an object. | 1. | Directional growth movement of a plant part in response to gravity |
| 2. | Stimulus: Touch | 2. | Stimulus: Gravity |
| 3. | The tendrils show positive thigmotropism. | 3. | The roots of the plant show positive geotropism. |
| 4. | The roots of the plant do not show Thigmbtropism. | 4. | The stems show negative Geotropism. |
| 5. | Example: Coiling of tendrils around support. | 5. | Example: Growth of the roots of plants in a downward direction |
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संबंधित प्रश्न
What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case
A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of :
(a) chemotropism
(b) hydrotropism
(c) phototropism
(d) geotropism
One of the following is not caused by the growth related movement of the concerned plant part. This is:
The movement of a shoot towards light is:
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.
The growth of tendrils in pea plants is due to
When the leaves of the Mimosa pudica plant are touched with a finger, they fold up quickly.
Give one example of geotropism.
Name the following:
The tropic movement of plant parts in response to chemicals.
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).
