Q5 of 28 Page 7

The gas released during the preparation of bread is

During preparation of bread yeast converts sugar to alcohol and release carbon dioxide gas by the process of fermentation.

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The two micro-organism which live in symbiotic association in lichens are

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The disease caused by a protozon and spread by an insect is________.

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Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packed with some agriculture waste. In pit B, she dumped the same kind of a waste but without packing it in a polythene bag. She then covered both the pits with soil. What did she observe after a month?