Question

Differentiate between
(b) Thigmotropism and Hydrotropism.

Answer 1

1. Thigmotropism is a type of movement seen in plant parts in response to contact with an object.
2. Hydrotropism is a type of movement seen in plant parts in response to the presence of water.

Characteristics	Thigmotropism	Hydrotropism
Meaning	Thigmo- touch, tropism- movement.	Hydro- water, tropism- movement.
External stimulus	Contact or friction with an object	Water
Example	Coiling of the stem tendril of Cucurbita plant around the object in contact for support to help the weak stems to climb.	Growth of plant roots towards the presence of moisture in the soil.