Colonies of yeast fail to multiply in water,but multiply in sugar solution. Give one reason for this.

(N/A) Yeast is a heterotrophic organism that requires an external source of energy to perform metabolic activities,including reproduction.
Sugar solution provides the necessary carbohydrates (glucose/sucrose) that yeast cells break down through respiration to generate $ATP$ (energy).
In water,there is no source of nutrition or energy available for the yeast cells to sustain their life processes or to undergo cell division,hence they fail to multiply.