Question

Plant parts show two types of movements, one dependent on growth and other independent of growth. Give one example of the movement in plant parts (a) which depends on growth
(b) which does not depend on growth

Answer 1

Plant movements:

(a) The movement in parts of plant which depends on growth is called tropic movement.

(b) The movement in parts of plant which does not depend on growth is called nastic movement.

Explanation:

Tropic movement:

• This movement is directional which is based on the certain stimulus.
• This movement of the plants is away or towards the stimulus.
• The example of this movement includes phototropism (based on light) and hydrotropism (based on water).

Nastic movement:

• This movement is directionless and it is based on the outer environment.
• The plants or plant parts does not move from one place to another place.
• The example of this movement is Mimosa Pudica (touch me not plant).

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Answer 2

Phototropism is Response to Light

Explanation:

(a) Phototropism - Light

• Phototropism depends on growth. It is the growth of plant stem in response to sunlight.

• The shoot system of a plant shows such nature, by moving towards light.

(b) Thigmonasty - Touch

• Thigmonasty does not depend on growth. It is a non directional movement of plant part, such as leaves, in response to touch.

• Directional movement in plants - response to touch.  

For e.g.  tendrils climb around support they touch.