Pawan Prajapati
Last Activity: 3 Years ago
Answer:(a) In cockroaches, air enters the body through
(i) lungs
ii. gills
(iii) spiracles √
(iv) skin
(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
ii. lactic acid √
ii. alcohol
(iv) water
(c) 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
(d) During exhalation, the ribs
(i) move outwards
(ii) move downwards √
(iii) move upwards
(iv) do not move at all