7 th (VII) Chapter: 07: Respiration of plants and Animals Hots Questions Solved 1. Why do plants have respiratory system? Ans: Plants directly absorb CO 2 through stomata present in leaves and used to prepared food and release O 2 2. Why do we yawn when we are sleepy? Ans: when we are sleepy our brain needs more oxygen to function properly. We yawn to gather a large amount of oxygen for our brain, to help it function faster and control drowsiness. 3. Can respiration take place in absence of oxygen? Ans: Yes, Respiration takes place in absence of oxygen when we are doing some strenuous activity. It is called anaerobic respiration. 4. What do you mean by Vital Capacity? What is vital capacity of a normal man? Ans: The maximum volume of air inhaled or exhaled by lungs is called vital capacity. It is measured by Spirometer.The vital capacity of a normal man is 4 to 6 lit. Chapter: 09: Reproduction in Plants and Animals 1. Can a single plants cell develop i
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