class iv green plants

Class IV Science

The Green Plants

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LeafLeaves appear green due

to the presence of chlorophyll.

Parts of a leafThe flat part of the leaf is called

Leaf BladeEach leaf has one main vein and

many side veinsThe veins help in transportation

of substances like water, minerals and prepared food to-and-from the leaf.

The lower surface of the leaf has stomata which helps a plant to breathe.

Parts of a leaf


Functions of a leafThe green leaves of a plant manufacture

food. So it is known as the food factory of a plant.

Leaf helps the plant to breathe through the holes called stomata.

Trees on mountain have needle like leaves to prevent water loss.


Leaves - PhotosynthesisThe process by which

leaves make their own food is called Photosynthesis. Photo means ‘light’, synthesis

means ‘to put together’.Green Plants make their

own food with help of chlorophyll present in leaves

Sunlight + Water + carbon dioxide are used .

Oxygen is given out in this process.

Water is absorbed by the roots and carried by the stem to the leaves

When light falls on

the leaves, it is

absorbed by

chlorophyll

Carbon dioxide is taken in through stomata


Leaves - Photosynthesis• The food prepared

by process of photosynthesis is called sugar

• Stems and branches of the plant take the prepared food from the leaves to other parts of the plants.

• Extra food is stored as starch in roots, stems, leaves ,fruits and in flowers.


Interdependence of Plants and Animals Green plants are the food producers .

Animals depend on these plants for food.

Plants give out oxygen, which is needed by animals to breathe. Animals in return give out carbon-di-oxide which is needed by plants to produce food.


Food ChainA chain exists in nature for obtaining

food. A chain that shows a series of organisms

where each member depends on the lower member in the series for food is called a food chain.

The interdependence of plants and animals in a food chain helps to maintain a balance between the number of plants and animals.


class iv green plants

Education

leaf leaves

food chain

prepared food

food producers

extra food

food factory

green leaves

leaves photosynthesis