Plant movements

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.