Q5 of 12 Page 118

In cockroaches, air enters the body through

(i) lungs (ii) gills


(iii) spiracles (iv) skin

A cockroach has small openings called spiracles on the sides of its body (see the picture attached).



Oxygen rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body.


More from this chapter

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3

Why do we often sneeze when we inhale a lot of dust-laden air?

 4

Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in the test- tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?

 5

During heavy exercise, we get cramps in the legs due to the accumulation of

(i) carbon dioxide (ii) lactic acid


(iii) alcohol (iv) water

 5

Normal range of breathing rate per minute in an average adult person at rest is:

(i) 9-12 (ii) 15-18


(iii) 21-24 (iv) 30-33


Correct option: (ii) 15-18