Gr 8 Natural Sciences Ch 1.1 SUM: Photosynthesis and Respiration
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Questions and Answers

What is the primary source of energy for sustaining life on Earth?

  • Radioactive energy
  • Chemical potential energy
  • The Sun's radiant energy (correct)
  • Glucose

    • What is the function of chlorophyll in plants?

  • To release oxygen
  • To absorb light energy (correct)
  • To regulate temperature
  • To store glucose

    • Where does photosynthesis occur in plant cells?

  • Nucleus
  • Cell wall
  • Chloroplasts (correct)
  • Mitochondria

    • What is the product of photosynthesis that serves as a primary energy source for living organisms?

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

    What is the term for energy stored within chemical bonds?

    <p>Chemical potential energy</p> Signup and view all the answers

    What is the process by which organisms release energy from food?

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

    What is the term for a substance that gives color to plant tissues and is involved in photosynthesis?

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

    What is the storage form of glucose in plants that is insoluble in water?

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

    What is the primary source of energy for the process of photosynthesis?

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

    What is the role of glucose produced during photosynthesis?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of the iodine test in photosynthesis?

    <p>To confirm the presence of starch, an indicator of glucose production</p> Signup and view all the answers

    What is the primary difference between starch and glucose?

    <p>Glucose is insoluble in water, while starch is also insoluble</p> Signup and view all the answers

    What is the purpose of respiration in organisms?

    <p>To release energy from food for life processes</p> Signup and view all the answers

    What are the primary reactants for respiration?

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

    What is the by-product of respiration that is expelled through exhalation in humans?

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

    What is the purpose of the limewater test?

    <p>To test for the presence of carbon dioxide</p> Signup and view all the answers

    What is the equation for respiration?

    <p>Glucose + Oxygen → Carbon Dioxide + Water + Energy</p> Signup and view all the answers

    What is the term for the solution used to test for the presence of carbon dioxide?

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

    What is the primary function of glucose produced during photosynthesis?

    <p>To provide energy for growth and maintenance</p> Signup and view all the answers

    Which of the following is a characteristic of starch?

    <p>Insoluble in water</p> Signup and view all the answers

    What is the purpose of the iodine test in photosynthesis?

    <p>To detect the presence of starch</p> Signup and view all the answers

    What is the by-product of respiration that is released into the atmosphere?

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

    What is the role of chlorophyll in the process of photosynthesis?

    <p>To absorb light energy from the Sun</p> Signup and view all the answers

    What is the term for the process by which cells break down glucose to release energy?

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

    What is the purpose of limewater in detecting carbon dioxide?

    <p>To detect the presence of carbon dioxide</p> Signup and view all the answers

    What is the primary source of energy for the process of respiration?

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

    What is the role of oxygen in the process of respiration?

    <p>To accept electrons during energy release</p> Signup and view all the answers

    What is the purpose of glucose in plant cells?

    <p>To release energy for growth and maintenance</p> Signup and view all the answers

    What is the primary mechanism by which plants harness energy from the Sun?

    <p>Converting light energy into chemical energy</p> Signup and view all the answers

    What is the significance of chloroplasts in plant cells?

    <p>They are the site of photosynthesis</p> Signup and view all the answers

    What is the result of the conversion of radiant energy into chemical potential energy?

    <p>Formation of glucose</p> Signup and view all the answers

    Which of the following is a characteristic of glucose?

    <p>It is a primary energy source for living organisms</p> Signup and view all the answers

    What is the relationship between light energy and heat energy from the Sun?

    <p>Heat energy affects the environment, while light energy is used for photosynthesis</p> Signup and view all the answers

    What is the primary function of chlorophyll in plants?

    <p>To absorb light energy for photosynthesis</p> Signup and view all the answers

    What is the significance of radiant energy from the Sun?

    <p>It is converted into chemical potential energy</p> Signup and view all the answers

    What is the role of plants in the energy cycle of life on Earth?

    <p>To convert light energy into chemical energy</p> Signup and view all the answers

    What is the primary function of chloroplasts in plant cells?

    <p>To convert light energy into chemical energy</p> Signup and view all the answers

    What is the characteristic of starch in plants?

    <p>It is insoluble in water</p> Signup and view all the answers

    What is the relationship between radiant energy and chemical potential energy?

    <p>Radiant energy is converted into chemical potential energy during photosynthesis</p> Signup and view all the answers

    What is the role of plants in the energy cycle of life on Earth?

    <p>To convert light energy into chemical energy through photosynthesis</p> Signup and view all the answers

    What is the significance of the Sun's energy for life on Earth?

    <p>It provides radiant energy for photosynthesis</p> Signup and view all the answers

    What is the characteristic of glucose in plants?

    <p>It is a storage form of energy in plants</p> Signup and view all the answers

    What is the role of the Sun's heat energy in the environment?

    <p>It affects the overall environment in which plants grow</p> Signup and view all the answers

    What is the result of the conversion of radiant energy into chemical potential energy?

    <p>The storage of glucose in plants</p> Signup and view all the answers

    What is the essential role of chlorophyll in the process of photosynthesis?

    <p>To absorb light energy from the Sun</p> Signup and view all the answers

    What is the primary purpose of storing glucose as starch in plants?

    <p>For long-term storage in various plant parts</p> Signup and view all the answers

    What is the biochemical process by which cells release energy from glucose?

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

    What is the significance of the limewater test in detecting carbon dioxide?

    <p>It indicates the presence of carbon dioxide</p> Signup and view all the answers

    What is the primary function of glucose produced during photosynthesis?

    <p>To provide energy for immediate growth</p> Signup and view all the answers

    What is the relationship between glucose and starch in plants?

    <p>Glucose is stored as starch</p> Signup and view all the answers

    What is the primary difference between glucose and starch?

    <p>Glucose is soluble, while starch is insoluble</p> Signup and view all the answers

    What is the purpose of testing for starch in plants?

    <p>To confirm the occurrence of photosynthesis</p> Signup and view all the answers

    What is the primary role of oxygen in the process of respiration?

    <p>To release energy from glucose</p> Signup and view all the answers

    What is the significance of the iodine test in detecting glucose?

    <p>It indicates the presence of glucose</p> Signup and view all the answers

    What is the primary difference between the way plants and other organisms utilize energy from the Sun?

    <p>Plants convert light energy into chemical energy, while other organisms use heat energy directly.</p> Signup and view all the answers

    What is the role of chloroplasts in plant cells?

    <p>To convert light energy into chemical energy</p> Signup and view all the answers

    What is the relationship between radiant energy and chemical potential energy?

    <p>Radiant energy is converted into chemical potential energy during photosynthesis</p> Signup and view all the answers

    What is the significance of plants in the energy cycle of life on Earth?

    <p>They are the primary producers of energy</p> Signup and view all the answers

    What is the purpose of storing glucose as starch in plants?

    <p>To store energy for later use</p> Signup and view all the answers

    What is the role of chlorophyll in the process of photosynthesis?

    <p>To absorb light energy and transfer it to other molecules</p> Signup and view all the answers

    What is the biochemical process by which cells release energy from glucose?

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

    What is the relationship between light energy and heat energy from the Sun?

    <p>Light energy is used directly for photosynthesis, while heat energy is used to regulate the environment</p> Signup and view all the answers

    What is the primary function of chlorophyll in the process of photosynthesis?

    <p>To absorb light energy from the Sun</p> Signup and view all the answers

    Which of the following is NOT a characteristic of starch?

    <p>Soluble in water</p> Signup and view all the answers

    What is the primary purpose of the iodine test in photosynthesis?

    <p>To detect the presence of starch</p> Signup and view all the answers

    What is the primary function of respiration in organisms?

    <p>To break down glucose to release energy</p> Signup and view all the answers

    What is the by-product of respiration that is expelled through exhalation in humans?

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

    What is the purpose of limewater in detecting carbon dioxide?

    <p>To detect the presence of carbon dioxide</p> Signup and view all the answers

    What is the primary source of energy for the process of respiration?

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

    What is the role of oxygen in the process of respiration?

    <p>To release energy from glucose</p> Signup and view all the answers

    What is the primary function of glucose produced during photosynthesis?

    <p>To serve as food for the plant</p> Signup and view all the answers

    What is the result of the conversion of radiant energy into chemical potential energy?

    <p>The synthesis of glucose from carbon dioxide and water</p> Signup and view all the answers

    What is the primary function of glucose produced during photosynthesis in plants?

    <p>To release energy for growth and maintenance</p> Signup and view all the answers

    What is the role of oxygen in the process of respiration?

    <p>To release energy from glucose</p> Signup and view all the answers

    What is the purpose of the limewater test?

    <p>To detect the presence of carbon dioxide</p> Signup and view all the answers

    What is the characteristic of starch in plants?

    <p>Insoluble in water and not sweet-tasting</p> Signup and view all the answers

    What is the by-product of respiration that is released into the atmosphere?

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

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