Question
In the figure, label the arrows and indicate the direction of 1. movement of air. 2. movement of diaphragm. 3. movement of ribs.
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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? Paheli participated in a 400 m race competition held at her school and won the race. When she came home she had mixed feelings of joy and pain as she had cramps in her leg muscles. After a massage she was relieved of the pain. Answer the following questions related to the situation. Q1. What can be the possible reasons for the pain in her legs? 2. Why did she feel comfortable after a massage?
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