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Breathing and Exchange of Gases Test 30

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Breathing and Exchange of Gases Test 30
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  • Question 1
    1 / -0
    In which part of the body, the blood is purified (oxigenation) ?
    Solution
    The lungs are responsible for the oxygenation (purification) of blood. In the lungs, alveoli are thin-walled structures and surrounded by numerous capillaries. At this site, the CO$$_2$$ from the blood is taken up by the alveoli and O$$_2$$ is replenished in the blood. 
    Thus, the correct answer is option C.
  • Question 2
    1 / -0
    Observe the given model that can be used to demonstrate the breathing mechanism in human beings.
    Name the structures which can be compared to.

    Solution
    The given model is of lungs. There is a pair of lung present in the human body contain air sacs called alveoli. They are connected to trachea. Trachea is also called windpipe that connects the pharynx and larynx to the lungs.
    So the correct answer is 'Lungs'. 
  • Question 3
    1 / -0
    The CO$$_{2}$$ in the blood is mostly carried
    Solution
    Carbon dioxide is carried in the body in the following forms:
    •7% of carbon dioxide is transported in the dissolved state in plasma.
    •23% of carbon dioxide is transported as carbaminohaemoglobin in blood.
    •70% of carbon dioxide is transported as bicarbonates in plasma.
    Hence, maximum carbon dioxide is carried in blood in plasma as bicarbonate ions.
    So, the correct answer is 'In the plasma as bicarbonate ions'.
  • Question 4
    1 / -0
    Tracheal respiration takes air to
    Solution
    The respiratory system consists of a network of the trachea, these thin tracheal branches carry oxygen from the air to the tissues. The opening of the spiracles is regulated by the sphincters. Exchange of gases takes place at the tracheoles by diffusion.
    So the correct answer is 'Tissues'.
  • Question 5
    1 / -0
    At rest the volume of air that moves in and out per hour is called
    Solution
    Tidal volume is the amount of air replaced during normal inhalation and exhalation when no extra effort is applied. It is 500ml in a normal healthy person.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    What is correct about breathing in adult Frog?
    Solution
    • Frogs can live both on land and in freshwater and belong to class Amphibia of phylum Chordata. 
    • Frogs respire on land and in the water by two different methods. In water, skin acts as a respiratory organ(i.e cutaneous respiration) by diffusion. 
    • On land, the buccal cavity, skin and lungs act as the respiratory organs. The respiration by lungs is called pulmonary respiration. Hence, on land adult frog breathe with skin, buccal cavity.
    So, the correct answer is 'on land skin, buccal cavity'.
  • Question 7
    1 / -0
    The medullary respiratory centre is directly affected
    Solution
    Chemical regulation of breathing is part of the involuntary (autonomic) control of breathing. This mechanism is part of the bodies homeostasis to maintain an appropriate balance and concentration of CO2, O2, HCO2- and pH. There are two types of chemoreceptors that react strongly to a change in the blood gases: central and peripheral chemoreceptors. Central chemoreceptors are located on the ventrolateral surface of the medulla oblongata. They respond indirectly to blood pCO2 but not to pO2. CO2 diffuses across the blood brain barier from blood to cerebral spinal fluid (CSF) while H+ and HCO3- are unable to.
    So, the correct option is 'Chemically'.
  • Question 8
    1 / -0
    Given below are four matchings of an animal and its kind, of respiratory organ.
    I.   Silver fish - Trachea
    II.  Scorpion - Book lung
    III. Sea squirt - Pharyngeal slits
    IV. Dolphin - Skin
    Which of them is true?
    Solution
    The respiratory organ of silverfish is trachea.
    Book lung is the respiratory organ of scorpions.
    Pharyngeal slits are the respiratory organs of sea squirt.
    Like other mammals, the respiratory organ of dolphin is lungs. 
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following statements is correct with respect to respiration?
    Solution
    Respiration is of two types: aerobic and anaerobic respiration. Aerobic involves oxygen. On the other hand, in anaerobic respiration, respiration occurs in an environment where the oxygen is very less or absent. In both the processes, energy is produced for the organism. But, the energy produced by aerobic respiration is much higher than the energy produced through anaerobic respiration.
    In higher organisms, respiration involves breathing (taking in oxygen-rich air and giving out carbon dioxide-rich air through nostrils) as well as cellular respiration.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    Type of respiration in Cockroach is
    Solution
    In cockroach respiratory system is well developed. The trachea plays a vital role in the transport of respiratory gases hence respiratory system is also called the tracheal system. The tracheal system includes;
    a) Stigmata or spiracles 
    b) Trachea 
    c) Tracheoles. 
    So, the correct answer is 'Tracheal'.
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