Long answer V — task. Science CBSE, Class 7.

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A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.

1. Why was sugar added to the dough?

The yeast's transpiration releases oxygen, raising dough.
Sugar acts as food for yeast.
The yeast's respiration releases oxygen, raising dough.
The yeast's transpiration releases carbon dioxide, raising dough.

2. What would have happened if the dough was kept in the refrigerator, soon after it was prepared?

In cold temperatures, yeasts can multiply and respire, preventing dough from rising and souring, which is necessary for baking.
In cold temperatures, yeasts cannot multiply and respire, preventing dough from rising and souring, which is necessary for baking.
In hot temperatures, yeasts cannot multiply and respire, preventing dough from rising and souring, which is necessary for baking.
In cold temperatures, yeasts cannot multiply and respire, allows dough for rising and souring, which is necessary for baking.

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28. Long answer V

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