In water, frogs exchange gases through its thin, moist and smooth skin which is richly supplied with blood capillaries. On land, frogs breathe through lungs.
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How do frogs breathe on land and in water?
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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. 
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