Some sugar solution is taken in a test-tube and a little of substance X in powder form is added to it. The mouth of test-tube is closed with a cork and allowed to stand for sometime. On opening the cork, a characteristic smell of substance Y is obtained and a gas Z is also observed to be formed. The gas Z extinguishes a burning matchstick.
(a) What could be (i) X, (ii) Y, and (iii,) Z ?
(b) What is the process of converting sugar into substance Y by the action of X known as ?
(c) What type of respiration is exhibited by X in the above process ?

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Solution

(a)(i)Yeast (ii)Ethanol (iii)Carbon dioxide
(b)Fermentation
(c)Anaerobic respiration

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(a)(i)Yeast (ii)Ethanol (iii)Carbon dioxide (b)Fermentation (c)Anaerobic respiration

(a)(i)Yeast (ii)Ethanol (iii)Carbon dioxide
(b)Fermentation
(c)Anaerobic respiration