Carbohydrates Tests in Pharmacognosy and Plant Chemistry Lab
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Questions and Answers

What color change would you expect when conducting the Molisch Test and observing the junction of two layers?

  • Yellow
  • Green
  • Violet (correct)
  • Brown
  • Which type of starch is derived from mature wheat grains?

  • Rice Starch
  • Corn Starch
  • Wheat Starch (correct)
  • Potato Starch
  • What is the Barfoed's reagent used for?

  • Testing for monosaccharides
  • Testing for proteins
  • Testing for lipids
  • Testing for disaccharides (correct)
  • Which test is used to identify the presence of starch with a deep-blue color indicating its presence?

    <p>Iodine Test</p> Signup and view all the answers

    Which type of starch is obtained from tubers of potatoes?

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

    What does a pink color observed in the Ruthenium Test indicate?

    <p>Presence of mucilage</p> Signup and view all the answers

    What reaction proceeds extremely slowly when disaccharides are used, even though disaccharides might be used?

    <p>Barfoed’s reagent</p> Signup and view all the answers

    Which color change is observed in the Molisch Test that indicates the presence of carbohydrates?

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

    What does the deep-blue color in the Lugol’s solution test indicate the presence of?

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

    Which starch is derived from rice grains?

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

    What does the absence of a blue color indicate in the Enzyme Test?

    <p>Absence of enzymes</p> Signup and view all the answers

    Which test involves observing a red precipitate after a few minutes for monosaccharides and after 3 minutes for disaccharides?

    <p>Barfoed’s reagent</p> Signup and view all the answers

    Which color is observed when conducting the Ruthenium Test to indicate the presence of mucilage?

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

    Which type of starch is obtained from mature wheat grains?

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

    What is determined by observing a blue color in the Enzyme Test?

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

    What distinguishes the starch obtained from corn grains according to Lugol's solution test?

    <p>Deep-blue coloration</p> Signup and view all the answers

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