Marking Scheme 2023-24 Class X Science Quiz
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Questions and Answers

What is the role of enzymes coded by a gene?

  • Cause lack of oxygen
  • Promote growth hormones
  • Influence the formation of lactic acid
  • Break down substances biologically (correct)

    • Where is the position of an image formed by a mirror located?

  • In front of the mirror at a fixed distance
  • Behind the mirror at a fixed distance (correct)
  • On the surface of the mirror
  • Inside the mirror

    • What causes the conversion of ozone into CFCs?

  • Interaction with oxygen molecules
  • Biological breakdown processes (correct)
  • High temperature reactions
  • Exposure to sunlight

    • What happens after fertilization in a plant?

    <p>The zygote divides to form an embryo, then the ovule converts into a seed</p> Signup and view all the answers

    What is the purpose of filtering out urea and uric acid from blood in humans?

    <p>To maintain pH balance</p> Signup and view all the answers

    What are the possible responses when observing a chemical reaction?

    <p>Change in color and evolution of gas bubbles</p> Signup and view all the answers

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