Page 25 - Science class 4

Scientific Terms

Food factories : green leaves
Chlorophyll : a green pigment present in leaves
Heterotroph : an organism that obtains its food from other organisms

Leaf blade : flat part of the leaf
Main vein : double pipe line of cells that runs in the centre of the leaf
Photosynthesis : process of making food by green plants

Side vein : parallel veins attached to the main vein
Stalk : attached part of the stem
Starch : food stored in plants

Stomata : tiny openings present in the lower surface of the leaf
Food chain : flow of energy in the form of food from one living thing to
another

Chapter at a Glance
³ Most plants that you see around are green in colour.

³ Veins help to distribute water and food within the leaf.
³ Plants and animals depend on each other.

³ Green plants make their own food by a process called photosynthesis.
³ Water, carbon dioxide, sunlight and chlorophyll are necessary for the process of
photosynthesis.

³ Space between the cells form small openings called stomata.
³ Stomata helps in the exchange of carbon dioxide and oxygen. They also give out

water vapours.
³ Plants use the food which they make for many purposes.
³ Some plants like croton has colourful leaves.

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photosynthesis Starch stomata glucose chlorophyll leaf blade