Question

Take two bottles and mark them A and B. Fill the bottles with water leaving some space at the top. Put two spoonfuls of sugar in each of the bottles. Add a spoonful of yeast in bottle B. Inflate the two balloons incompletely. Now tie the balloons on the mouths of each bottle. Keep them in a warm place, away from sunlight. Watch the setup every day for next 3-4 days. Record your observations and think of an explanation

Answer 1

Answer:

Bottle B inflates the balloon after a few days.

Explanation:

The yeast consumes the sugar and turns it to energy. When it does this, it also produces carbon dioxide. This process is called fermentation. The carbon dioxide produced inflates the balloon.

Hope it helps

Answer 2

Answer:

As the yeast feeds on the sugar, it produces carbon dioxide. With no place to go but up, this gas slowly fills the balloon.

A very similar process happens as bread rises. Carbon dioxide from yeast fills thousands of balloonlike bubbles in the dough. Once the bread has baked, this is what gives the loaf its airy texture.