Page 145 - Science Class 6 Times Publication

The baking soda is also known as edible soda and is used by people
who are suffering from acidity.

Yeast (Marcha)

Yeast is an unicellular, microscopic and non-green plant. It grows
quickly in sugar rich substances. The yeast contains the vitamins B
and E and proteins. The yeast produces an enzyme called zymase.
This enzyme converts the foodstuffs containing sugar into alcohol
and carbon dioxide. Hence, yeast is used to manufacture alcohol,
beer, wine, etc.

The process of conversion of sugars into alcohol by the use of yeast is
called fermentation. Cooked and cooled rice, millet, wheat, potato, etc
can be fermented to alcohol by using yeast.
Yeast can also be used in the production of bread, cake and biscuit.

Main Points to Remember

1. Some of the chemical substances have good taste and other
useful properties.

2. Common salt, baking powder, sour juice, iodine, turmeric,
zymase (an enzyme produced by yeast), etc are some useful
chemicals used in our daily life.
3. The chemical name of common salt is sodium chloride.

4. Turmeric powder is obtained by cleaning, slicing, drying,
and grinding the rhizome of a turmeric plant.
5. Sour juice or chook is a locally produced dark thick syrup
with strong sour taste. Chemically, it contains citric acid.

6. Baking powder is the common chemical used in bakeries.

Exercise

1. Choose the best alternative in each case:

a. The spice that provides hot taste to our food

i. Chilli powder ii. Ginger

Times' Crucial Science and Environment 141 Book 6