When fish is kept outside water, the gills become dry and stick to each other. Thus, gas exchange cannot occur.
Question
Why does a fish die when kept outside water, even though there is oxygen in the surrounding air?
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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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