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Sunday, 2 December 2018

Some Examples of Tropic Responses





Stimulus - Name of Response - Examples

• Light - Phototropism - Shoots of green plants bend towards light (positively phototropic), some roots bend away (negatively phototropic), and leaves position themselves at right angles (diaphototropic)

• Gravity - Geotropism - Generally, shoots of green plants vend away from gravity (negatively geotropic), while roots Bend towards it (positively Geotropic)

• Water - Hydrotropism - Roots bend towards moisture ( positively hydrotropic), while stems and leaves show no response

• Touch - Thigmotropism -  Tendrils of a climbing plant twine around a support ( as a positive response to touch), while root tips grow away from stones (as a negative response to touch)

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