Test: Respiratory Organs, Human Respiratory System

10 Questions MCQ Test Biology Class 11 | Test: Respiratory Organs, Human Respiratory System

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The alveoli of lungs are lined by:

  • The respiratory or gas-exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous epithelium.
  • This epithelium is exceedingly thin to facilitate the diffusion of oxygen and CO2
  • The alveolar walls also contain cuboidal surfactant-secreting cells.

Which one of the following mammalian cells are not capable of metabolising glucose to carbon dioxide aerobically?

  • In animal cells process of aerobic respiration is carried out in mitochondria. The mammalian red blood cells (RBC) lack nucleus, mitochondria and all other major cell organelles as well.
  • Hence, RBCs cannot metabolize glucose aerobically and depend on anaerobic respiration for their energy needs.

The pharynx opens into the larynx by a slit-like aperture called ______.

  • The pharynx opens into the larynx by a slit-like aperture called the glottis, which is covered by a cartilaginous flap called the epiglottis.
  • The epiglottis closes the glottis to prevent the entry of food particles during swallowing.

Book lungs are respiratory organs of:


book lung is a type of respiration organ used for atmospheric gas exchange that is found in many arachnids, such as scorpions and spiders.


Which of the following is not the function of the respiratory system?

  • The respiratory system helps in the regulation of blood pH, gaseous exchange and also contain receptors of smell, produces vocal sound and filter inspired air.
  • While the cardiovascular system protects against blood loss by the formation of blood clots.

The two organisms that breath only through their moist skin are:

  • Earthworms respire only through the moist skin which is permeable to gases and Leeches also breathe through the skin.
  • Frogs don't respire always through the skin whereas Fishes respire through gills.

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:

  • The volume of air remaining in the lungs even after a forcible expiration is called residual volume.
  • This residual volume prevents the lungs from collapsing.

Lungs have a large number of narrow tubes called ______.

  • The narrow tubes found inside the lungs are called bronchioles
  • When we breathe, air travels from the nose or mouth, and goes down the trachea and reaches the part called the carina.
  • From here the tube branches into two, creating two bronchi that lead to the left and right lung each.
  • From there onwards, the bronchi split into smaller and smaller bronchioles until it terminates in the alveoli where gas exchange occurs.Bronchiole - Wikipedia 

The lungs are enclosed in a covering called ______.

  • The pleural membranes are two layers of the serous membrane which enclose and protect the lung.
  • The superficial layer is called the parietal pleura and lines the wall of the thoracic cavity.
  • The deep layer is called the visceral pleura and covers the lungs themselves.

Which of the following statement is true about Trachea, in a respiratory system?


The trachea serves as a passage for air, moistens and warms it while it passes into the lungs, and protects the respiratory surface from an accumulation of foreign particles.