Plant movement

1.

Plant movement

2.

Lesson objectives
Describe the meaning of plant
movement.
Explain the causes of plant movement

3.

Plant movement
Plants cannot change its location,
but it can move its organs.

4.

TROPISM MOVEMENT
Plant movement due to stimuli is
called as tropism.
Stimuli is a anything that cause
change.
According to type of stimuli there
are 3 types of tropic movement:
1. Phototropism (light)
2. Geotropism (gravity)
3. Chemotropism (chemicals)

5.

There are two types of tropism
movement
according to direction:
1. positive = if direction is towards to
stimuli
2. negative= if direction is away from
stimuli

6.

Phototropism
Stem has positive phototropism

7.

8.

Roots have negative phototropism

9.

Geotropism
Roots have positive geotropism, but
stems have negative geotropism.

10.

Chemotropism
Pollen tube grow toward the ovule
due to chemotropism

11.

Nastic movement
It is non-directional movement of
plant organs.
According to stimuli there are :
1. Photonasty (light)
2. Nyctinasty (dark condition)
3. Thigmonasty (touch)

12.

Photonasty and Nyctinasty
Opening and closing of flowers

13.

14.

Thigmonasty
Mimosa plant leaves move if
something touches it.

15.

Let’s do activity on p81

16.

Homework
Read p.80-81
Literacy on p. 81
New words