9/22/2021 Tropic Movements in Plants: Meaning of Tropic Movements, Types of Movements- FlexiPrep
FlexiPrep Tropic Movements in Plants: Meaning of Tropic Movements, Types of Movements (For CBSE, ICSE, IAS, NET, NRA 2022)
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Meaning of Tropic Movements The directional movement of parts of plants in response to environmental stimuli.
Plants react to environmental stimuli such as touch, light, water, gravity, etc.
The movements are slow. Either towards the stimulus.
Away from it.
If a plant moves towards the stimulus, a stimulus would be positive.
If a plant moves away from the stimulus, the stimulus will negative.
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Types of Movements
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Phototropism This movement occurs in response to light.
Plants grow either towards or away from the light.
The stems show positive phototropism.
The roots show negative phototropism.
Gravitropism/Geotropism Plants show some plants show some growth in response to gravity.
The stem grows along the upward direction showing a negative geotropism.
The roots grow in the downward direction indicating a positive geotropism.
In case of prostrate plants: Stems lose their negative geotropism.
Develops into tubers or rootstock.
Chemotropism This tropism takes place in reaction to chemical stimuli.
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It is very common in case of flowering plants.
Some of the examples are: Tentacles movement in Drosera.
The movement of pollen tube towards the ovary.
Conversion of a flower into fruit.
Thigmotropism/Haptotropism It is the growing or the developing movements made through plants in response to contact with a solid object.
The tendrils and twiners usually show these movements.
This movement is also common in money plants, green peas, etc.
Hydrotropism This movement is in relation to the stimulus of water.
The equivalent response to the stimulus of water is known as hydrotropism.
The roots show the positive hydrotropic response. Moving and growing towards the water.
Thermotropism This is the response towards a change in atmospheric temperature.
Some of the examples: The curling of leaves in Rhododendron.
The curling of leaves in Mimosa pudica leaves.
FAQs Q 1. List some the external factors supporting Tropic movements.
Answer: Some of the external factors supporting tropic movements are light, gravity, temperature, water, etc.
Q 2. What are the six types of movements in Plants?
Answer: The six types of movements in Plants are namely Phototropism, Gravitropism, Chemotropism, Thigmotropism, Hydrotropism, Thermotropism.
Q 3. Explain any three directional movements in Plants.
Answer:
i) Phototropism-a reaction to light.
ii) Geotropism- a reaction to gravity.
iii) Thermotropism-a reaction to the change in temperature.
Developed by: Mindsprite Solutions
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