CBSE  /  Class 7  /  Science  /  Nutrition in Animals

  • 1. 
    The swallowed food moves downwards in the alimentary canal because of:

  • force provided by the muscular tongue.
  • the flow of water taken with the food.
  • gravitational pull.
  • the contraction of muscles in the wall of food pipe.

  • 2. 
    The acid present in the stomach:

  • kills the harmful bacterial that may enter along with the food.
  • protects the stomach lining from harmful substances.
  • digests starch into simpler sugars.
  • makes the medium alkaline.

  • 3. 
    The enzymes predsent in the saliva convert:

  • fats into fatty acids and glycerol
  • starch into simple sugars
  • proteins into amino acids
  • complex sugars into simple sugars
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