Q11 of 28 Page 8

Name one commercial use of yeast.

One commercial use of yeast is making bread.

Bread dough is a mixture of flour, water, salt, sugar, yeast cells. Yeast converts sugar to alcohol and carbon dioxide. Due to the production of carbon dioxide gas, the dough rises in volume and bread becomes porous and spongy.


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9

Suggest a suitable word for each of the following statements.

(a) Chemicals added to food to prevent the growth of the microorganism.


(b) Nitrogen-fixing micro-organisms present in the root nodules of legumes.


(c) Agents which spread pathogens from one place to another.


(d) Chemicals which kill or stop the growth of pathogens.

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Match the names of the scientist given in COLUMN A with the discovery made by them given in COLUMN B.

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Name the process in yeast that converts sugar into alcohol.

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In the soil, which nutrients are enriched by blue-green algae (cyanobacterial)?