Q] Which of the following statement is correct related to tropic movement- (a) It is controlled by the intensity of the stimulus. (b) Overall change of place takes place by a plant or part of the plant. (c) This movement is observed in the algae called Volvox. (d) It is an induced movement of curvature controlled by the direction of stimulus.
Answers
Answer: Tropic movement is the movement of the plant in response to the stimulus present in the environment, this movement is in response to root and shoot growth. They are mainly of five types:
Phototropism - It is the movement of a plant in response to light, they will grow towards the direction of the light. It may be positive (if towards the light) or negative phototropic (if away from the light).
Geotropism - The movement of the plant in response to the gravity, they will move in the direction of gravity. The roots will grow downwards and show positive geotropism while shoot will grow upwards and thus show negative geotropism.
Chemotropism - In seed plants, the movement of pollen grains to the female gamete is due to the secretion of chemicals. This shows positive chemotropism.
Hydrotropism - It is the movement of plants in response to water, the roots of the plant will grow towards the area where water is present.
Thigmotropism - It is the movement or action of reflex of a plant in response to the touch. It is commonly observed in the touch me not plant. As the leaves are touched they droop.
Explanation:
Answer:
The correct statement is (d) It is an induced movement of curvature controlled by the direction of stimulus.
Explaination:
Tropic movement
- Tropic movement is a type of plant movement that is induced by a directional stimulus, such as light, gravity, or touch.
- The plant or part of the plant bends or curves in response to the direction of the stimulus. This movement is not determined by the intensity of the stimulus, as stated in other options.
option (a) and Option (b) is incorrect because tropic movement does not necessarily involve an overall change of place by a plant or part of the plant.
Option (c) is also incorrect because tropic movement is not observed in Volvox, which is a type of algae that exhibits a different type of movement known as phototaxis.
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