Plants show two main types of movements: tropic and nastic. Tropic movements are directional responses to stimuli like light, gravity, water, chemicals, or touch. They include phototropism, geotropism, hydrotropism, chemotropism, and thigmotropism. Nastic movements are non-directional responses unaffected by the stimulus direction, such as the folding or drooping of leaves in the touch me not plant in response to changes in leaf water levels.

1. Movements in Plants
Class-10th

2. Learning Objectives
After completing this lesson ,students will able
to –
• Define plant movements.
• List various types of movements in plants.
• Explain various types of movements in plants.

3. Movements in plants
Plants show many types of movements. Movements in plants
are of two main types. They are :-Tropic movements and Nastic
movements.
Tropic-Movement Nastic Movement

4. Tropic movements
Tropic movements are directional
movements towards or away from the
stimulus and it depends on growth.
Tropic movements in plants are as
follows.
(Click on buttons)
Photo-tropism
Geo-Tropism
& Hydro-tropism
Chemotropism Back
Thigmotropism

5. Phototropism
It is movement of plants in
response to light.
If it is towards light, it is called
positive phototropism. Eg:-
Bending of shoot towards
light.
If it is away from light, it is
called negative phototropism.
Eg:- Bending of root away from
light.
Back

6. GEOTROPISM
Geotropism :- It is the movement of
plants in response to gravity
. If it is towards gravity it is called
positive geotropism. Eg:- Downward
growth of roots
If it is away from gravity it is called
negative geotropism. Eg:- Upward
growth of shoot.
Hydrotropism
It is the movement of plants in response
to water.
Eg :- Growth of roots towards water.
Back

7. Chemotropism
It is movement of
plant in response to
chemical stimuli.
Eg:- Growth of pollen
tube towards the
ovule.
Back

8. Thigmotropism Thigmotropism is the
directional movement
,shown by parts of plants in
response to touch or
physical contact with other
object.
It is shown by tendrils of
plants.
Back

9. Nastic movements
These are non directional movements and unaffected by direction of stimulus.
Eg :- If we touch the leaves of “Touch me not plant”, its leaves fold up
and droops down immediately due to the change in the amount of
water in the leaves. Depending upon the amount of water in the
leaves, it swells or shrinks.