Q47. How do the cockroaches breathe?
Q48. Why does an athlete breathe faster and deeper than usual after finishing the race?
Q49. Why do we respire?
Q50. List the similarities and differences between aerobic and anaerobic respiration.
Q51. How do we breathe?
Q52. Take three test-tubes. Fill ¾ th of each with water. Label them A, B and C. Keep a snail in 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?
Q53. Write one word for the following:
i. The air tubes of insects - ___________
ii. Skeletal structures surrounding chest cavity - _____________
iii. Muscular floor of chest cavity - ______________
iv. Tiny pores on the surface of leaf - _________________
v. Small openings on the sides of the body of an insect - _____________
vi. The respiratory organs of human beings - _____________
vii. The openings through which we inhale - ___________
viii. An anaerobic organism - __________
ix. An organism with tracheal system - ___________
Q54. Whales and dolphins often come up to the water surface. They even release a fountain of water sometimes while moving upwards. Why do they do so?
Q55. Explain the mechanism of breathing with the help of an activity.