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प्रश्न
Differentiate between:
Positive and negative tropism
उत्तर
| Positive tropism | Negative tropism | ||
| 1. | The growth in direction of a stimulus. | 1. | The growth away from a stimulus. |
| 2. | The stems of plants shows positive phototropism. | 2. | The stem of plants shows negative gravitropism. |
| 3. | The root of plants show positive geotropism. | 3. | The root of plants shows negative phototropism. |
संबंधित प्रश्न
Where is the auxin hormone made in a plant stem?
What is a plant hormone? Name four plant hormones. State one function of each.
Name the five types of tropisms.
Name the plant part which bends towards light but away from the force of gravity.
The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:
The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
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
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
______ of sweet peas exhibit thigmotropism.
