2. Questions Bank
  3. 9th Class
  4. General Knowledge
  5. Conservation of Plants and Animals

9th Class General Knowledge Conservation of Plants and Animals Question Bank Plants and Animals

  • question_answer
    Nacre is a hard, iridescent, crystalline substance secreted by some animals in response to an irritant. Which of these precious substances contains nacre?

    A)  Coral

    B)  Amethyst

    C)  Pearl

    D)  Aquamarine

    Correct Answer: C

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