Heating Alcohol Experiment Quiz
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Questions and Answers

Which of the following is a by-product of photosynthesis?

  • Carbon dioxide
  • Glucose
  • Oxygen (correct)
  • Water

    • What are the raw materials for photosynthesis?

  • Oxygen and water
  • Carbon dioxide and oxygen
  • Water and glucose
  • Carbon dioxide and water (correct)

    • What is the energy source for photosynthesis?

  • Water
  • Carbon dioxide
  • Light (correct)
  • Glucose

    • What is the food produced during photosynthesis?

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

    What do plants use glucose for?

    <p>Growth and respiration</p> Signup and view all the answers

    What is the function of chlorophyll in photosynthesis?

    <p>Absorbing light energy</p> Signup and view all the answers

    Which of the following is NOT a necessary factor for photosynthesis?

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

    What is the purpose of destarching a plant before investigating the necessary factors for photosynthesis?

    <p>To ensure that the leaves do not contain any starch</p> Signup and view all the answers

    What is the role of alcohol in the experiment?

    <p>To remove the chlorophyll from the leaf</p> Signup and view all the answers

    What happens to the glowing splint when placed over the mouth of the plastic bottle?

    <p>It relights</p> Signup and view all the answers

    What is the color of the leaf after adding iodine solution?

    <p>Blue-black</p> Signup and view all the answers

    What do bubbles in water indicate during the experiment?

    <p>Presence of oxygen</p> Signup and view all the answers

    According to the text, which of the following statements about photosynthesis is true?

    <p>Photosynthesis is important for maintaining the balance of oxygen and carbon dioxide in nature</p> Signup and view all the answers

    Based on the text, what would happen if all plants on the island died?

    <p>Only the animals that feed on plants would die</p> Signup and view all the answers

    In a food chain, which of the following is true?

    <p>Plants are producers and animals are consumers</p> Signup and view all the answers

    Based on the text, what is the ultimate source of energy for all food chains?

    <p>The Sun</p> Signup and view all the answers

    According to the text, what is the significance of photosynthesis?

    <p>Providing food for living things</p> Signup and view all the answers

    Based on the text, which of the following is an example of a food chain?

    <p>Grasshopper, grass, bird</p> Signup and view all the answers

    Which variable is the only variable that is changed in an experiment?

    <p>Independent variable</p> Signup and view all the answers

    What is the purpose of destarching a plant before conducting investigations about the factors necessary for photosynthesis?

    <p>To ensure that the plant does not have any starch at the beginning of the investigation</p> Signup and view all the answers

    Which statement about carbon dioxide and photosynthesis is true?

    <p>Carbon dioxide is a necessary factor for photosynthesis</p> Signup and view all the answers

    What is the correct order of steps for testing for starch in a green leaf?

    <p>(a) Put the leaf in hot alcohol, (b) Put the leaf in boiling water, (c) Add iodine solution to the leaf, (d) Wash the leaf in hot water</p> Signup and view all the answers

    Which variable is measured in an experiment and is affected by the independent variable?

    <p>Dependent variable</p> Signup and view all the answers

    What is the purpose of destarching a plant before conducting investigations about the factors necessary for photosynthesis?

    <p>To ensure that the plant does not have any starch at the beginning of the investigation</p> Signup and view all the answers

    Which of the following is a true statement about photosynthesis?

    <p>Carbon dioxide is needed for photosynthesis.</p> Signup and view all the answers

    Which of the following statements about photosynthesis are correct?

    <p>Photosynthesis converts light energy into chemical energy.</p> Signup and view all the answers

    What is the chemical equation for photosynthesis?

    <p>6CO2 + 6H2O -&gt; C6H12O6 + 6O2</p> Signup and view all the answers

    How can we confirm that photosynthesis has taken place in a plant?

    <p>By observing the color change of iodine solution</p> Signup and view all the answers

    What is the purpose of boiling the leaf in alcohol during the starch testing experiment?

    <p>To remove the chlorophyll from the leaf</p> Signup and view all the answers

    What is the purpose of the control set-up in the iodine test for starch?

    <p>To provide a reference for the color change of iodine solution</p> Signup and view all the answers

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