Page 222 - New Medley 4 Semester 1

This process of making food by green During this process, oxygen gas and
plants is called photosynthesis. The water vapour are given out in the air.
process of photosynthesis can be written
shortly in the form of an equation.

Carbon dioxide + Water Sunlight Glucose + Oxygen + Water vapour
Chlorophyll

Teacher tells the students how plants use the food they make.

Like animals, plants also use
the food they make for their
growth, building new cells
and to repair the worn-out
cells. Plants store food in the
form of starch. They store
food in seeds, roots, stem
and in leaves.

Teacher wants students to know that plants store food as starch. So, she

explains an activity.

Let us check if starch is present in
the given food sample.
• Take a piece of potato, iodine
solution and a dropper.
• Pour iodine drops on a piece of
potato with the help of dropper.

• See, the yellow-brown colour of
iodine changes to blue-black.
This shows that food item (potato)
has starch in it.

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