Respiration in organisms Worksheet-2

Respiration in organisms Worksheet-2


Multiple-Choice Questions:

  1. Which of the following animals have tracheae?

(a) Earthworms                                (b) Grasshoppers         

(c) Hydras                                         (d) Corals


  1. The respiratory control center of humans is located in the:

(a) Alveoli

(b) Trachea         

(c) brainstem (medulla oblongata)

(d) Erythrocytes


  1. The exchange of gases between interstitial fluid and the blood occurs in the:

(a) Capillaries      (b) Arteries          (c) Venules          (d) Veins


  1. The location in the lungs where the exchange of gases take place is the:

(a) Bronchiole     (b) Alveolus         (c) Bronchus        (d) pleural membrane


  1. The expansion of the lung and inhalation of air are in part the result of:

(a) the contraction of the muscles of the diaphragm

(b) the relaxing  of muscles of the lungs, allowing the lungs to get larger

(c) the contraction of the muscles of the ribs

(d) the relaxing  of muscles of the diaphragm


Fill in the Blanks:

  1. The process of breathing out of air rich in carbon dioxide is called _______.
  2. The process of intake of air rich in oxygen is called _______.
  3. One of the main functions of the _______ system is to allow exchange of gases in our body.
  4. When food is broken down in our body, ______and carbon dioxide is produced.
  5. ______ is the process of intake of air rich in oxygen and giving out air rich in carbon dioxide.



  1. The brain regulates the rate at which we breathe by monitoring the amount of oxygen in the blood.
  2. Birds have evolved active transport mechanisms to augment their respiratory gas exchange.
  3. Respiratory gases are exchanged by diffusion only.
  4. Respiration is essential for survival of living organisms.
  5. The oxygen we inhale is used to breakdown glucose into water and energy.
  6. If the breakdown of food in the body cells occurs without the use of oxygen, the respiration is called anaerobic respiration.
  7. The diaphragm is a muscular organ that helps in inhalation and exhalation.
  8. During inhalation, our lungs contract and then come back to the original state as the air moves out during exhalation.


Answer key:

Multiple-Choice Questions:

  1. (B)
  2. (C)
  3. (A)
  4. (B)
  5. (A)

Fill in the Blanks:

  1. Exhalation
  2. Inhalation
  3. Respiratory
  4. Water
  5. Breathing


  1. F
  2. F
  3. T
  4. T
  5. F
  6. T
  7. T
  8. F