Air around us Worksheet-5

Air around us Worksheet-5

Multiple-Choice Question:

41. During burning, __________ is produced.

(a) oxygen                                        (b) carbon dioxide                

(c) nitrogen                                      (d) None of these

42. Most aquatic animals such as crabs and shrimps have special organs for respiration called:

(a) lungs              (b) spiracles       (c) gills                 (d) None of these

43. Birds have a very efficient _________ system as they need high levels of oxygen during flight.

(a) digestive                                     (b) respiratory

(c) circulatory                                  (d) excretory

44. The balance of oxygen and carbon dioxide in the atmosphere is maintained through _________ in animals and by _________ in plants.

(a) photosynthesis, respiration     

(b) respiration, photosynthesis

45. Air pollution also leads to a lot of lung diseases, such as:

(a) Asthma                                       (b) Lung cancer

(c) Bronchitis                                   (d) All of these

46. By which of the following ways we can reduce air pollution?

(a) Recycling plastics  

(b) Planting more and more trees

(c) Regular checking of vehicles for emission of harmful gases

(d) All of these

47. Plants produce _________ during photosynthesis and utilize _________ during respiration.

(a) oxygen, oxygen                          (b) carbon dioxide, carbon dioxide

(c) oxygen, carbon dioxide             (d) None of these

48. Most ___________ breathe with the help of lungs.

(a) reptiles                                        (b) mammals

(c) insects                                         (d) aquatic animals

49. The human respiratory system consists of:

(a) Windpipe       (b) Alveoli            (c) Diaphragm     (d) All of these

Answer Key:

41. (b)
42. (c)
43. (b)
44. (b)
45. (d)
46. (d)
47. (a)
48. (b)
49. (d)