Question

EXERCISES
3. In fish, exchange of gases takes place through Tracheae are presentin alan (b) spiracles (a) lungs (c) body skin O(d) gills 4. (b) fish (a) frog (c) earthworm (d) insect 5. We can hold our breath only for a few (d) years (a) seconds 6. Alcohol is formed in (a) aerobic (b) hours (c) days respiration. (b) anaerobic (c) cellular 7. As the air passes through the nasal cavity, it becomes (b) very cold (c) warm 8. Normal range of breathing rate in an average adult person atrestis O b (b) 15-18 (c) 21-24 (d) leaf (a) cold Ö (d) hot times/minute. (d) 30-33 (a) 9-12 9. In cockroaches, air enters the body through (b) gills 0 c (c) spiracles (d) skin (a) lungs 10. During exhalation, the ribs (a) move outwards B. Fill in the blanks: (b) move upwards (c) move downwards (d) do not move at all 1. The number of times a person breathes in a minute is called branches into two thinner tubes called​

Answer 1

Explanation:

Oxygen and carbon dioxide dissolve in water, and most fishes exchange dissolved oxygen and carbon dioxide in water by means of the gills.

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Answer 2

answer in this attachment