Question

Significants of tropic movements and any two types of tropic movements

Answer 1

Bending of plants parts towards any external stimuli eg. sun flower bend towards sun or light.
1 Phototropism
2 Geotropism
3 Hydrotropism
4 Chemotropism

Answer 2

Tropic Movement:-

They are directional growth movements of curvature in which the direction of movement is determined by direction of stimulus.

Tropic movements can be seen in stems and roots.

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1. Phototropism:- It's directional growth movement in response to unidirectional exposure to light.

• Leaves and the whole shoots are positively phototropic
• Roots are negatively phototropic.

2. Geotropism:- It's directional growth movement which occurs in response to gravity.

• Roots are positively geotropic
• Shoots are negatively geotropic.

3. Hydrotropism:- Its directional growth movement which occurs in response to unidirectional stimulus of water.

• Roots are positively hydrotropic

4. Thigmotropism:- Its directional growth movement which occurs in response to stimulus of contact.

5. Chemotropism:- It's directional growth movement which occurs in response to chemical stimulus.