Question

B. Answer the following in not more than 40 words.
1. How do fish and tadpoles breathe?
2. Why does the respiration rate increase after exercise?
3. What are the two steps involved in respiration?
4. What is anaerobic respiration? How do we make use of it?​

Answer 1

Answer:

1 .fish breathe in water using gills. Water flows across the gills and blood is allowed to exchange oxygen and carbon-dioxide.Tadpoles breathe the same way as fishduring that stage of life before maturing into frogs that use their lungs to breathe.

2. When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise.

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