Page 22 - Science class 4

The midrib and side veins have small tubes inside them. These tubes are of
two types :

± The tubes that carry water from the roots to the leaves.

± The tubes that help in carrying the food made in the leaves to all the
other parts of the plant.

The inside part of a leaf shows many layers of cells. Look at the cells through a
microscope. You will see many layers of cells. Spaces between the cells form

small openings called Cuticle

stomata . Air comes into Upper epidermis
the leaves through these
Palisade mesophyll cell
small openings. Stomata

are usually found on the Bundle sheath cell
lower surface of a leaf.
Vein Xylem

Phloem
Guard cell
Lower epidermis
Stoma
Cuticle Spongy mesophyll cells

A section of leaf as seen under a microscope
Keeping Update

Vanamahotsava programme encourages to promote the planting of trees.

Food Preparation Process by the Food Preparation Process by the
Food Preparation Process by the
light energy
Leaves
Leaves
Leaves
For making its food, a plant gets water
from the soil and absorbs carbon dioxide
oxygen from the air. It takes the energy needed to

produce food from the Sun. Water and

carbon carbon dioxide are changed into food or
dioxide sugar with the help of chlorophyll in the
presence of sunlight. Carbon dioxide is

taken in through the stomata.
carbohydrates
After the food is prepared, oxygen is

Leaf prepares food for the plant given out through the stomata.

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