A. Answer the following in not more than
1. How do earthworms breathe?
2. How does an insect take in air and how does the air reach the different parts of its body?
3. What is respiration rate?
4. How do the leaves of plants exchange gases with the atomsphere?
5. Why do gardeners loosen the soil from time to time?
6. When does anaerobic respiration occur in our body?
7. What roles do the hair and the membrane of the nasal cavity play?
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