Movement in Animals and Plants — BIOLOGY STD 7 — Question
ICSE BoardEnglish MediumSTD 7BIOLOGYMovement in Animals and Plants3 Marks
Question
How is phototropism different from hydrotropism ? Explain with one example of each.
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Answer
Phototropism :
It is the movement of plant part in response to light.
Plant part which grows towards light is called positively phototropic while which grows away from light is called negatively phototropic.
Example : A stem is positively phototropic since it grows towards light
Hydrotropism :
It is the movement of plant part in response to moisture.
Plant part which grows towards the source of moisture is called positively hydrotropic while which grows away from source of moisture is called negatively hydrotropic.
Example : Roots are positively hydrotropic since it grows towards moisture.
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