Question

02. Name the organs through which insects take in air
03. Which organ extracts dissolved oxygen from water in fishes?
04. Where does exchange of gases take place in lungs?
Q5. Why do we feel hungry after the physical activity?
Q6. Explain the mechanism of breathing in human
Q7. What is respiration without oxygen called? How do plants take in air?
Q8. Give reasons
a. Valves are present in veins.
b. Artenes have thick & elastic muscular wall.
o White patches are formed on our clothes in summer​

Answer 1

tracheae

Explanation:

Oxygen and carbon dioxide gases are exchanged through a network of tubes called tracheae. Instead of nostrils, insects breathe through openings in the thorax and abdomen called spiracles.

Answer 2

Respiration without air is called unaerobic respiration.