| (i) In cockroaches, air enters the body through spiracles. |
| (ii) During heavy exercise, we get cramps in the legs due to accumulation of carbon dioxide. |
| (iii) Normal range of breathing rate per minute in an average adult person at rest is 12-18. |
| (iv) During exhalation, the ribs move upwards. |
A)
(i)
(ii)
(iii)
(iv)
F
T
F
T
B)
(i)
(ii)
(iii)
(iv)
T
T
F
T
C)
(i)
(ii)
(iii)
(iv)
T
F
T
F
D)
(i)
(ii)
(iii)
(iv)
T
T
T
F
Correct Answer: C
Solution :
During heavy exercise, we get cramps in the legs due to accumulation of lactic acid. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position, this movement reduces the size of chest cavity and air is pushed out of the lungs.
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