Q.3- Answer each of the following questions in few sentences.
1.- what are alveoli ? Write their function.
2.- A jet aeroplane covers 3300 km in 5 hours. Calculate its speed.
3 - What is average speed ?
4- give two methods to prevent rusting of iron.
5- Why is cooking of food is considered a chemical change ?
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Answer:
The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. Oxygen breathed in from the air passes through the alveoli and into the blood and travels to the tissues throughout the body.
Explanation:
2 Distance = 3300 km
Time = 5 hrs
Speed = distance/time
= 3300/5 km/hr
= 660 km/hr
Hence, the speed of jet aeroplane is 660 km/hr
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