Respiration in organisms Worksheet-4

Respiration in organisms Worksheet-4


Multiple-Choice Questions:

  1. The process that transfers carbon from plants and animals into the atmosphere is:

(a) Fermentation                             (b) cellular respiration

(c) Decomposition                           (d) Breathing


  1. How/Where do plants store glucose?

(a) In leaves                                      (b) In cytoplasm

(c) As chlorophyll                            (d) As starch


  1. In photosynthesis, carbon gets transferred:

(a) from the cell to the air

(b) from the living to the nonliving environment

(c) from the nonliving to the living environment

(d) from the air into the cell


  1. Small spaces in the skull thought to regulate the temperature and humidity of the air taken into the body are called:

(a) Sinuses           (b) Alveoli            (c) Tonsils


  1. This tube carries air down to the windpipe.

(a) Sinuses           (b) Pharynx         (c) Larynx            (d) Oesophagus


Fill in the Blanks:

  1. _______ is the process of releasing energy from the breakdown of food.
  2. In unicellular animals, ______ gas is absorbed directly from the water or air and carbon dioxide is released by diffusion.
  3. Most aquatic animals such as fishes use special organs called ________ for breathing.
  4. The gills of the fish are like slits and are made up of a large number of thread-like structures called ______.
  5. The filaments in fishes are richly supplied with tiny blood vessels called _____.



  1. In animals like cow, buffalo, dog and cat; the respiratory organs and the process of breathing are similar to those in humans.
  2. The breakdown of glucose in the plant cells is not similar to that in other living beings.
  3. During heavy exercise when the supply of oxygen to our muscle cells is insufficient, food breakdown is by aerobic respiration.
  4. The respiratory system of humans comprises the nose, trachea, bronchus, lungs, and alveoli.
  5. The breakdown of glucose does not occur in the cells of an organism (cellular respiration).
  6. In a plant, the roots take in air which is present in the soil.
  7. Breathing takes place inside the cells.


Answer key:

Multiple-Choice Questions:

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

Fill in the Blanks:

  1. Respiration
  2. Oxygen
  3. Gills
  4. Filaments
  5. Capillaries


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