Tropism (Types, positive & negative) | Control & Coordination | Biology | Khan Academy
Khan Academy India - English・2 minutes read
Plants exhibit movements in response to environmental stimuli known as tropism, including phototropism towards light and gravitropism away from light. Tropic movements can be named based on the stimulus and can be positive or negative, as seen in various examples in plants.
Insights
- Tropism in plants involves directional movements in response to stimuli like light and gravity, with examples including phototropism towards light and gravitropism away from light.
- Nastic movements in plants, unlike tropic movements, are independent of stimulus direction, showcasing a distinct mechanism of plant response beyond tropism.
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Recent questions
What are tropic movements in plants?
Tropic movements in plants refer to the directional growth or movement in response to environmental stimuli, such as light or gravity.
What is phototropism in plants?
Phototropism in plants is the movement where they bend towards a source of light.
What is gravitropism in plants?
Gravitropism in plants is the growth response where roots grow away from light and shoots grow towards gravity.
What are nastic movements in plants?
Nastic movements in plants are non-directional movements that do not depend on the direction of the stimulus.
What is positive tropism in plants?
Positive tropism in plants refers to movement towards the stimulus, such as bending towards light in phototropism.
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Summary
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Plant Tropic Movements: Response to Stimuli
- Plants also exhibit movement in response to environmental stimuli, known as tropism or tropic movements.
- Tropism involves turning movements towards or away from a stimulus, such as sunlight or gravity.
- Phototropism occurs when plants bend towards light, while gravitropism (or geotropism) involves roots growing away from light and shoots growing towards gravity.
- Nastic movements in plants do not depend on the direction of the stimulus and are not considered tropic movements.
- Tropic movements can be named based on the stimulus, such as phototropism for light and gravitropism (or geotropism) for gravity.
- Other examples of tropism include touch tropism (phygmotropism) and chemotropism, where plants respond to touch or chemicals.
- Positive tropism refers to movement towards the stimulus, while negative tropism is movement away from the stimulus, as seen in various examples of tropic movements in plants.
