UNIT 2: AIR
C. Plants need air
Imagine what will happen to a plant if it does not get air.
As you have learnt in grade 3, plants are living things. So plants also need air to stay alive,
but plants do not have a nose like us. So how do they take in air from the environment?
Let us nd out.
Observe the Figure 8.
Figure 8 - Plants need air
A tree A leaf
air
air
air
air
(a) Which part of the tree takes in air?
...............................................................................................................................................................................................................................
A plant takes in air through very small holes in the leaves.
These holes are invisible to our eyes.
29