Gr 8 Natural Sciences Ch 1.1: Photosynthesis
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Questions and Answers

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

  • The Sun (correct)
  • Starch
  • Chemical potential energy
  • Glucose

    • What is the green pigment in plants that absorbs light energy for photosynthesis?

  • Glucose
  • Chlorophyll (correct)
  • Pigment
  • Chloroplast

    • Where does photosynthesis occur in plant cells?

  • In the leaves and stems
  • In the chlorophyll
  • In the chloroplasts (correct)
  • In the roots

    • What is the process by which plants convert light energy into chemical energy stored in glucose?

    <p>Photosynthesis (C)</p> Signup and view all the answers

    What is the form of energy stored in the chemical bonds of glucose?

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

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

    <p>Respiration (D)</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 (A)</p> Signup and view all the answers

    What is the characteristics of starch in water?

    <p>Insoluble (C)</p> Signup and view all the answers

    What is the energy source required for photosynthesis?

    <p>Sunlight (C)</p> Signup and view all the answers

    What is the primary function of glucose produced during photosynthesis?

    <p>Energy release (B)</p> Signup and view all the answers

    What is the insoluble compound that glucose can be converted into for long-term storage?

    <p>Starch (D)</p> Signup and view all the answers

    What is the indicator that confirms glucose has been produced and stored during photosynthesis?

    <p>Presence of starch (A)</p> Signup and view all the answers

    What happens to iodine when it comes into contact with starch?

    <p>It turns from brownish-orange to dark blue-black (A)</p> Signup and view all the answers

    What is a characteristic of starch?

    <p>It is insoluble in water and not sweet (D)</p> Signup and view all the answers

    What role does the Sun's heat energy play in photosynthesis?

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

    What is the immediate use of glucose produced during photosynthesis in plants?

    <p>To release energy for growth and maintenance through respiration (D)</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 (C)</p> Signup and view all the answers

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

    <p>Plants convert radiant energy into chemical potential energy (B)</p> Signup and view all the answers

    Which of the following compounds is sweet-tasting and soluble in water?

    <p>Glucose (C)</p> Signup and view all the answers

    What is the result of the conversion of light energy into chemical energy during photosynthesis?

    <p>Production of glucose (A)</p> Signup and view all the answers

    What is the purpose of testing for the presence of starch in plants?

    <p>To validate the occurrence of photosynthesis (B)</p> Signup and view all the answers

    What is the significance of iodine turning from brownish-orange to dark blue-black?

    <p>It shows the presence of starch in plant tissues (D)</p> Signup and view all the answers

    Why is it necessary for plants to convert glucose into starch?

    <p>To store glucose for long-term energy storage (D)</p> Signup and view all the answers

    What is the outcome of converting glucose into starch?

    <p>Glucose becomes insoluble and not sweet-tasting (B)</p> Signup and view all the answers

    What is the significance of chlorophyll in plant cells?

    <p>It absorbs light energy for photosynthesis (C)</p> Signup and view all the answers

    What is the primary role of glucose in living organisms?

    <p>To act as a source of energy (B)</p> Signup and view all the answers

    What is the role of glucose in plant growth and reproduction?

    <p>It is converted into various chemicals for growth and reproduction (C)</p> Signup and view all the answers

    What is the relationship between photosynthesis and respiration?

    <p>Photosynthesis produces energy for respiration (B)</p> Signup and view all the answers

    What is the ultimate source of energy for the production of glucose in photosynthesis?

    <p>Radiant energy from the Sun (D)</p> Signup and view all the answers

    What is the role of chlorophyll in photosynthesis?

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

    What is the relationship between light energy and chemical potential energy in photosynthesis?

    <p>Light energy is converted into chemical potential energy (D)</p> Signup and view all the answers

    What is the purpose of storing glucose as starch in plant cells?

    <p>To store energy for long-term use (B)</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 (C)</p> Signup and view all the answers

    Why is photosynthesis essential for life on Earth?

    <p>Because it converts light energy into chemical energy (B)</p> Signup and view all the answers

    What is the significance of glucose produced during photosynthesis?

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

    How does radiant energy from the Sun contribute to photosynthesis?

    <p>It provides light energy for photosynthesis (A)</p> Signup and view all the answers

    What is the equation for photosynthesis?

    <p>Carbon dioxide + Water → Glucose + Oxygen (A)</p> Signup and view all the answers

    What is the purpose of starch in plants?

    <p>To store energy for long-term use (D)</p> Signup and view all the answers

    What is the primary function of glucose in plants?

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

    What is the result of testing for starch in plants?

    <p>Iodine turns from brownish-orange to dark blue-black (C)</p> Signup and view all the answers

    What is the relationship between glucose and starch?

    <p>Glucose is soluble and starch is insoluble (C)</p> Signup and view all the answers

    What is the significance of chlorophyll in photosynthesis?

    <p>It absorbs light energy from the Sun (B)</p> Signup and view all the answers

    What is the primary reason why plants convert glucose into starch?

    <p>To store energy for long-term use (B)</p> Signup and view all the answers

    What is the chemical property that allows iodine to detect starch in plant tissues?

    <p>Color change from brownish-orange to dark blue-black (D)</p> Signup and view all the answers

    What is the primary benefit of storing glucose as starch in plant cells?

    <p>Insolubility in water for long-term storage (A)</p> Signup and view all the answers

    What is the chemical compound that serves as an indicator of photosynthesis in plants?

    <p>Starch (D)</p> Signup and view all the answers

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

    <p>Release energy for growth and maintenance (D)</p> Signup and view all the answers

    What is the primary reason why plants undergo photosynthesis?

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

    What is the primary reason why plants convert light energy into chemical energy?

    <p>To store energy in the form of chemical bonds (B)</p> Signup and view all the answers

    Which of the following processes is NOT directly dependent on radiant energy from the Sun?

    <p>Respiration (A)</p> Signup and view all the answers

    What is the significance of chlorophyll in plant cells?

    <p>It absorbs light energy for photosynthesis (C)</p> Signup and view all the answers

    What is the ultimate source of energy for the production of glucose in photosynthesis?

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

    What is the primary difference between glucose and starch?

    <p>Glucose is soluble in water, while starch is insoluble (A)</p> Signup and view all the answers

    What is the significance of the chloroplasts in plant cells?

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

    What is the result of the conversion of light energy into chemical energy during photosynthesis?

    <p>The storage of energy in the form of chemical bonds (D)</p> Signup and view all the answers

    Why is photosynthesis essential for life on Earth?

    <p>It is the primary source of energy for all living organisms (C)</p> Signup and view all the answers

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