Colonies of yeast fail to multiply in water, but multiple in sugar solution because:
i. In the presence of water, yeast is not able to multiply as there is no source of food for them.
ii. On the other hand, in the presence of sugar solution, yeast is able to multiply as sugar gives energy to yeast by providing food.
iii. In sugar solution, yeast can respire and as a result get multiplies.
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