Laboratory Materials and Solutions Quiz
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Questions and Answers

What is the purpose of placing one potted Plectranthus plant in the dark for 48 hours?

  • To detect the presence of starch in the leaves
  • To observe the effect of ethyl alcohol on plant leaves
  • To compare the growth rate of the plant in dark and light conditions
  • To test the role of light in photosynthesis (correct)

    • What is the purpose of boiling the leaves in a water bath?

  • To test for the presence of cellulose in the leaves
  • To increase the concentration of starch in the leaves
  • To soften the leaves for easier handling (correct)
  • To extract pigments involved in photosynthesis

    • Why are the boiled leaves transferred and immersed in ethyl alcohol?

  • To preserve the leaves for future analysis
  • To remove any impurities from the leaf surface
  • To detect the presence of chlorophyll in the leaves (correct)
  • To eliminate any remaining water content

    • Which material is essential for testing starch in leaves after boiling them?

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

    Why is it important to mark the two beakers containing water during the experiment?

    <p>To avoid mixing up the beakers (C)</p> Signup and view all the answers

    What is the consequence of boiling the beaker set-up under direct flame?

    <p>Pigment extraction will be hindered (B)</p> Signup and view all the answers

    Why is it essential to compare the results between exposed and covered areas of the leaves?

    <p>To observe the effect of light intensity on color change (C)</p> Signup and view all the answers

    What is the purpose of using a water bath for boiling in the experiment?

    <p>To keep a constant temperature during boiling (B)</p> Signup and view all the answers

    Which pigment is typically extracted from the leaves during the experiment?

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

    Why do you need to drain the excess iodine after waiting for 10 minutes in step 'g'?

    <p>To remove excess starch from the leaves (C)</p> Signup and view all the answers

    What is the purpose of adding iodine solution to cover the leaves in step 'f'?

    <p>To visualize presence of starch (D)</p> Signup and view all the answers

    What are the three main requirements for photosynthesis to occur?

    <p>Light, carbon dioxide, and water (A)</p> Signup and view all the answers

    Which of the following is the general equation for photosynthesis?

    <p>6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 (C)</p> Signup and view all the answers

    Which of the following is NOT a pathway for glucose, the main product of photosynthesis?

    <p>Conversion into heat energy (C)</p> Signup and view all the answers

    What is a key objective that a student is expected to accomplish at the end of the exercise related to factors affecting photosynthesis?

    <p>Identify the impact of light intensity on photosynthesis rate (D)</p> Signup and view all the answers

    In photosynthesis, what is the main role of chloroplasts?

    <p>Facilitate the photosynthetic process by capturing light energy (B)</p> Signup and view all the answers

    What is one task a student might be expected to do related to pigments in photosynthesis?

    <p>Extract and identify the pigments involved in photosynthesis (A)</p> Signup and view all the answers

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