Increased physical activity increases the rate of oxidations of food, which in turn needs more oxygen. This further results in increase of the breathing rate.
Question
What happens during increased physical activity?
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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. Q1. Why did the dough rise? Q2. Why did the dough smell sour? Q3. Why was sugar added to the dough? Q4. What would have happened if the dough was kept in the refrigerator, soon after it was prepared?
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1. Which process is being tested in the activity? 2. What is the result of the activity? Give reasons. 
1.In which jar, will the amount of CO2 be the highest and why? 2. In which jar, will the amount of CO2 be the lowest and why?