Movement in plants
The plants are fixed at a place with their roots in the ground , so they cannot move from one place to another.That is plants cannot show locomotion ( movement of the entire body). But plants can move their individual parts .
The two types of plant movements are :- 1.) Tropic movements 2.) Nastic movements
The growth movement in plants in which the direction of the external stimulus is a factor is known as Tropic movements .
- .) the growth movement towards the direction of stimulus is known as positive tropism .
- .)the growth movement away from the direction of stimulus is known as negative tropism.
ex:- Bending of shoot towards sunlight is a Positive Tropic movement
- Types of tropism - Stimulus
- 1.Hydro tropism - Water
- 2.Photo tropism - Light
- 3.Chemo tropism - Chemical
- 4.Thigmo tropism - Touch
- 5.Geo tropism - Gravity
Non growth movements of a plant where the external stimulus is not the determinant is know as nastic movements.
ex:- Closing of leaves of the Touch-me-Not plant is a nastic movement.