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Breathing and Exchange of Gases Test 20

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Breathing and Exchange of Gases Test 20
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  • Question 1
    1 / -0
    How are alveoli designed to maximize the exchange of gases?
    Solution
    Alveoli are small pouches or sacs. Large number of alveoli occur inside each lung. The whole surface area of an alveolus functions as a respiratory surface. Due to large number of  alveoli in each lung, a very large area of respiratory surface becomes available (about $$80{ m }^{ 2 }$$) for exchange of gases. Thus, alveoli are designed to maximize the exchange of gases.
    Therefore, the correct answer is option C.
  • Question 2
    1 / -0
    .......... is the respiratory pigment which carry oxygen in the blood.
    Solution
    A respiratory pigment is any molecule that increases the oxygen carrying capacity of blood. The oxygen carrying capacity is the amount of oxygen the red blood cells in blood can carry to our tissues and organs. In humans and most other vertebrates, the most common respiratory pigment is a protein called haemoglobin. Haemoglobin is the protein molecule in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.
  • Question 3
    1 / -0
    The plants excrete $$CO_2$$ produced as a waste during ______ process in night time.
    Solution
    Plants eliminate waste through diffusion. During the day, excess oxygen gas produced by photosynthesis is released through the stomata. Carbon dioxide produced by respiration is normally used up during photosynthesis. At night, however, as photosynthesis slows, carbon dioxide is not used up as fast as it is produced, and it is released as a waste product. Plants also produce oxygen as a by-product of photosynthesis. The oxygen that is not used for respiration is also excreted through the stomata.
  • Question 4
    1 / -0
    Why do whales and dolphins often come up to the water surface?
  • Question 5
    1 / -0
    Sulphur dioxide affects  
  • Question 6
    1 / -0
    Which parts make air move into the lungs?

  • Question 7
    1 / -0
    The process of respiration is concerned with the
    Solution
    Every living organism requires energy to carry out the various life processes such as nutrition, locomotion and movement, digestion, etc. This energy is obtained through the process of respiration. Respiration is the biochemical process of breakdown of glucose to liberate energy.
    So, the correct answer is 'C'.
  • Question 8
    1 / -0
    Which one of the following has the smallest diameter?
    Solution

    Solution

    Correct answer is option D.

    Explanation for correct option:                                

    • Bronchi are present on both left and right side in lungs.
    • Each of this bronchus is divided into smaller secondary bronchi.
    • These secondary bronchi further divide to give more smaller tertiary bronchi which eventually branches in very small tubules called as bronchioles. The respiratory bronchioles have a diameter of 0.5 millimetres.
    • Each respiratory bronchiole branches into 2 to 11 alveolar ducts.

  • Question 9
    1 / -0
    Which of the following is not a water borne disease?
    Solution
    Cholera is the infection of the small intestine by some strains of the bacteria Vibrio cholerae. The bacteria are transmitted between humans through fecal-oral route, a bite of contaminated food or a sip of contaminated water.
    Amoebiasis is an infection caused by the amoebas of the Entamoeba group. Amoebiasis can be transmitted by ingestion of water contaminated with feces containing amoebic cysts.
    Asthma, however, cannot be transmitted from person to person.
    Therefore, the correct answer is option A.
  • Question 10
    1 / -0
    Characteristic feature of haemoglobin
    Solution
    Haemoglobin is a protein which is used in red blood cells to store and transport oxygen. The reversible nature of the binding of oxygen allows for both the uptake of oxygen in the lungs and its release in body tissues.
    Haemoglobin does not contain any Cu, it contains Fe.
    The globulins are a family of globular proteins that have higher molecular weights than albumins and are insoluble in pure water but dissolve in dilute salt solutions. They are not present in haemoglobin.
    So the answer is 'Reversible union with oxygen'. 
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