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Respiration in Organisms Test - 6

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Respiration in Organisms Test - 6
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  • Question 1
    1 / -0
    In insects, respiratory gas exchange occurs through:
    Solution

    Gaseous exchange in insects occurs through a system of air-filled internal tubes, the tracheal system, the finer branches of which extend to all parts of the body and may become functionally intracellular in muscle fibres. Thus, oxygen is carried in the gas phase directly to its sites of utilization.

    So, the correct answer is 'Tracheae'.
  • Question 2
    1 / -0
    Which organ is used by fish for respiration?
    Solution
    Gills in fish help them to use oxygen dissolved in water. Gills are projections of the skin. Gills are well supplied with blood vessels for exchange of gases.
    Hence the correct option is A.
  • Question 3
    1 / -0
    The breathing rate of an adult human at rest is __________.
    Solution
    The number of times a person breathes in a minute is termed the breathing rate. On average, an adult human being at rest breathes in and out 15-18 times in a minute. During heavy exercise, the breathing rate can increase up to 25 times per minute.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    In cockroach, O$$_2$$ is carried to tissue by:
    Solution
    A cockroach has small openings on the sides of its body. These openings are called spiracles. Insects have a network of air tubes called tracheae for gas exchange. Oxygen-rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body. Similarly, carbon dioxide from the cells go into the tracheal tubes and moves out through spiracles. These air tubes or tracheae are found only in insects and not in any other group of animals.
    So, the correct option is C.
  • Question 5
    1 / -0
    The respiratory organs of fish are
    Solution
    • Aquatic respiration is the process whereby an aquatic animal obtains oxygen from water.
    • Most fish exchange gases using gills on either side of the pharynx (throat).
    So, the correct answer is 'gills'.
  • Question 6
    1 / -0
    The air we breathe out contains more _________.
    Solution
    The air we inhale is a mixture of gases that includes mainly oxygen, nitrogen, and small amounts of carbon dioxide, etc. The respiratory tract carries air from the nose to the lungs. Oxygen is diffused into blood and carbon dioxide from blood diffuses into the lungs. Oxygen is used by body cells for producing energy. Thus, we exhale the air in which the percentage of carbon dioxide is more than its percentage inhaled. The amount of nitrogen inhaled is the same as the amount of nitrogen exhaled. 
    So, the correct option is B.
  • Question 7
    1 / -0
    Which is/are the respiratory organ(s) present in frog?
    Solution
    The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them. Though frogs have a pair of lungs like human beings, they can also breathe through their skin, which is moist and slippery.
    So, the correct answer is 'lungs and skin'.
  • Question 8
    1 / -0
    Chest cavity is enlarged by action of _______.
    Solution
    The diaphragm is a large muscular sheet that forms the floor of the chest cavity. Its movement is crucial for breathing. When it moves downward during inhalation, the volume of the chest cavity increases whereas its upward movement helps in expelling the air out of the lungs. 
    Hence the correct option is B.
  • Question 9
    1 / -0
    Which of the following animals breathe through their skin and lungs?
    Solution
    Fishes use a specialized organ called gills to breathe. They use the oxygen dissolved in water. Some animals which live on land have skin which is so thin that gases can easily pass through it. For example, Earthworms and amphibians have a skin which is permeable to gases. Earthworms do not have lungs and breathe only through their skin. Most amphibians breathe through both skin and lungs. The frog is an amphibian. So, the answer is B.
  • Question 10
    1 / -0
    Lenticels are found in 
    Solution
    • A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants.
    • It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. Hence, Lenticels are found in the stem in which secondary growth has taken place.
    So, the correct answer is 'The stem in which secondary growth has taken place'.
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