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Life Processes Test - 28

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Life Processes Test - 28
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Weekly Quiz Competition
  • Question 1
    1 / -0

    When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of

    Solution

    Carbon dioxide reacts with limewater Ca(OH)2 to form calcium carbonate which makes the lime water milky.

  • Question 2
    1 / -0

    The correct sequence of anaerobic reactions in yeast is

    Solution

    Breakdown of pyruvate under anaerobic condition takes place in cytoplasm of yeast. Ethanol and carbon dioxide are produced at the end of this reaction.

  • Question 3
    1 / -0

    Which of the following is most appropriate for aerobic respiration?

    Solution

    In aerobic respiration, breakdown of pyruvate takes place in mitochondria. Carbon dioxide and water are produced at the end of this reaction.

  • Question 4
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    Which of the following statement(s) is (are) true about respiration?

    (i) During inhalation, ribs move inward and diaphragm is raised

    (ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air

    (iii) Haemoglobin has greater affinity for carbon dioxide than oxygen

    (iv) Alveoli increase surface area for exchange of gases

    Solution

    Statement (i) is incorrect. During inhalation, ribs move outward and diaphragm is lowered. Statement (iii) is incorrect because haemoglobin has greater affinity for oxygen than carbon dioxide.

  • Question 5
    1 / -0

    During respiration exchange of gases take place in

    Solution

    Trachea and larynx just serve as passage for air. Exchange of gases takes place in alveoli; where oxygen diffuses into blood and carbon dioxide comes out of blood.

  • Question 6
    1 / -0

    Which of the following statement (s) is (are) true about heart?

    (i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs

    (ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs

    (iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts

    (iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body

    Solution

    Deoxygenated blood circulates through right part of the heart, while oxygenated blood circulates through left part of the heart. Atrium receives blood, while ventricle pumps the blood out.

  • Question 7
    1 / -0

    What prevents backflow of blood inside the heart during contraction?

    Solution

    Walls of heart facilitate the pumping action only and have no role in preventing backflow of blood.

  • Question 8
    1 / -0

    Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

    Solution

    In option ‘a’; salamander is amphibian, while chameleon is reptile; and they have three chambered heart. Thus, these animals show partial double circulation. In option ‘c’ all animals are amphibians.
    In option ‘d’ whale is mammal, while turtle is reptile. Mammals have four-chambered heart and completely double circulation.

  • Question 9
    1 / -0

    In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

    Solution

    This happens because of single circulation.The deoxygenated blood from all body parts comes to heart and is pumped to the gills where it gets oxygenated. This oxygenated blood is transferred to all body parts from gills.

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