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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
What is the stimulus in thigmotropism?
What does a stem (or shoot) do in response to gravity? What is this phenomenon known as?
What does a Mimosa pudica plant do in response to touch? What is this phenomenon known as?
To which directional stimuli do shoots respond?
Plant roots grow downward in response to ______.
Which of the following acts as a stimulus in the process of hydrotropism?
(a) hydrocarbon
(b) hydrogen oxide
(c) hydrogen chloride
(d) hydrogen peroxide
P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.
(a) What is (i) R, and (ii) S?
(b) What is the name of growth movement exhibited by the organs R and S?
(c) Name the stimulus involved in this case.
(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.
(e) Name one plant like P and another plant like Q.
Name the stimulus which causes the following movements in plants.
phototropism, thigmotropism, hydrotropism and geotropism
The bending of root of a plant in response to water is called ______.
The Scientific term used to represent the bending of roots toward water is called geotropism.
