Air around us Worksheet-5

Air around us Worksheet-5


Multiple-Choice Question:

  1. During burning, __________ is produced.

(a) oxygen                                        (b) carbon dioxide                

(c) nitrogen                                      (d) None of these


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

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


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

(a) digestive                                     (b) respiratory

(c) circulatory                                  (d) excretory


  1. 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


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

(a) Asthma                                       (b) Lung cancer

(c) Bronchitis                                   (d) All of these


  1. 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


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

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

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


  1. Most ___________ breathe with the help of lungs.

(a) reptiles                                        (b) mammals

(c) insects                                         (d) aquatic animals


  1. The human respiratory system consists of:

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


Answer Key:

  1. (b)
  2. (c)
  3. (b)
  4. (b)
  5. (d)
  6. (d)
  7. (a)
  8. (b)
  9. (d)