Question

Differentiate between
a) Thigmotropism and geotropism
b) Phototropism and chemotropism
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Answer 1

Answer:

Plant tropisms are the result of differential growth. ... Growth in the direction of a stimulus is known as positive tropism, while growth away from a stimulus is known as a negative tropism. Common tropic responses in plants include phototropism, gravitropism, thigmotropism, hydrotropism, thermotropism, and chemotropism.

Answer 2

Answer:

(a)

Thigmotropism is a movement in which an organism moves or grows in response to touch or contact stimuli. Eg. Climbing plants, such as vines, contain tendrils that coil around supporting objects

while

The movement of a plant in response to gravity is called geotropism. Eg - Root growing downward.

(b)

Phototropism is the direction of growth of a plant in response to the direction of the light. Eg - Movement of shoot of plant upwards towards light

while

The movement of plant towards or away from chemicals is called chemotropism. Eg - Growth of pollen tubes towards ovules.