Gas Exchange in Animals
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Questions and Answers

Which of the following statements about stomata is true?

  • Stomata are only open during the daytime
  • Stomata allow the plant to release oxygen into the air
  • Stomata are openings on the upper epidermis of a leaf
  • Stomata are surrounded by guard and closing cells (correct)

    • What is the main function of guard cells?

  • To release oxygen into the air
  • To take in carbon dioxide for photosynthesis
  • To regulate the temperature of the leaf
  • To control the opening and closing of stomata (correct)

    • During the daytime, what happens to the guard cells?

  • They release oxygen into the air
  • They become swollen and full of water (correct)
  • They regulate the temperature of the leaf
  • They shrink and lose water

    • What happens to the guard cells at night?

    <p>They shrink and lose water</p> Signup and view all the answers

    What is the main purpose of stomata in plants?

    <p>To take in carbon dioxide for photosynthesis</p> Signup and view all the answers

    What is the color of the cobalt chloride paper after being exposed to exhaled air?

    <p>Pink</p> Signup and view all the answers

    What is the temperature of inhaled air compared to exhaled air?

    <p>Inhaled air is higher in temperature</p> Signup and view all the answers

    Which of the following is a key factor in gas exchange in plants?

    <p>The presence of stomata</p> Signup and view all the answers

    What is the net gas exchange in plants during the daytime?

    <p>Net uptake of carbon dioxide and net release of oxygen</p> Signup and view all the answers

    What happens to gas exchange in plants at night?

    <p>Net uptake of oxygen and net release of carbon dioxide</p> Signup and view all the answers

    What is the purpose of using hydrogencarbonate indicator in Experiment 7.7?

    <p>To show any change in carbon dioxide content</p> Signup and view all the answers

    What is the net release of carbon dioxide in plants?

    <p>Net uptake of oxygen and net release of carbon dioxide</p> Signup and view all the answers

    What is the main source of food for plants?

    <p>Sunlight</p> Signup and view all the answers

    What is the role of stomata in gas exchange in plants?

    <p>To allow gas exchange</p> Signup and view all the answers

    Which gas is removed from our bodies through gas exchange during respiration?

    <p>Carbon dioxide</p> Signup and view all the answers

    What is the purpose of setting up the boiling tube in Experiment 7.12?

    <p>To study the gas exchange in mealworms</p> Signup and view all the answers

    What happens to the limewater in flask B and flask D when the vacuum pump is turned on in Checkpoint 7.6?

    <p>Limewater in flask B turns yellow and limewater in flask D turns pink</p> Signup and view all the answers

    What is the purpose of the diaphragm in the human breathing system?

    <p>To draw air into the lungs</p> Signup and view all the answers

    Where does gas exchange take place in the human breathing system?

    <p>Air sacs</p> Signup and view all the answers

    What is the pathway of air flowing through the human breathing system?

    <p>Nasal cavity -&gt; Trachea -&gt; Bronchi -&gt; Lungs</p> Signup and view all the answers

    What is the texture of the pig's lungs observed in the experiment?

    <p>Soft</p> Signup and view all the answers

    Which of the following is the primary function of gas exchange in humans?

    <p>To provide a continuous supply of oxygen to body cells</p> Signup and view all the answers

    Where does gas exchange in humans take place?

    <p>In the air sacs inside the lungs</p> Signup and view all the answers

    What is the purpose of gas exchange between the air sacs and the blood capillaries?

    <p>To allow oxygen to enter the blood and carbon dioxide to leave the blood</p> Signup and view all the answers

    How large is the total surface area of our lungs?

    <p>About the size of a tennis court</p> Signup and view all the answers

    In which lungs do you think gas exchange is more effective, frog's or human's?

    <p>Human's</p> Signup and view all the answers

    How does smoking affect gas exchange in humans?

    <p>It decreases the effectiveness of gas exchange</p> Signup and view all the answers

    What is the primary purpose of the vacuum pump in the smoking experiment with pig lungs?

    <p>To simulate the smoking process by the lungs</p> Signup and view all the answers

    What is the purpose of observing the lung tissue carefully in the smoking experiment with pig lungs?

    <p>To determine if the lung tissue floats or sinks in water</p> Signup and view all the answers

    What is the effect of smoking on the lungs of a pig, as shown in the smoking experiment?

    <p>The lung tissue sinks in water</p> Signup and view all the answers

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