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TEKS Grade 7 Science - 7.6.A Physical & Chemical Changes

Quiz by Grade 7 Science - Texas Education Agency

Grade 7
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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4 questions
Show answers
  • Q1
    Many processes occur in the digestive system. Which process is best classified as a physical change?
    Digestive enzymes breaking down proteins into smaller fragments
    Teeth grinding an almond into smaller pieces in the mouth
    Bacteria converting lactose into simple sugars in the intestines
    Saliva converting the starch molecules in crackers into simple sugars
    60s
    7.6
  • Q2
    A student listed how different parts of the body work to aid in the digestion of food. Which of the following is a chemical change that occurs to the food?
    The reduction in size of food particles as food is chewed
    None of the above
    The breakdown of molecules of food by enzymes and acid in the stomach
    The movement of food to the stomach after food is swallowed
    60s
    7.6
  • Q3
    Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules. Which statement best describes changes to food during digestion?
    The muscle contractions and the action of the peptidase both result only in chemical changes.
    The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.
    The muscle contractions and the action of the peptidase both result only in physical changes.
    The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.
    60s
    7.6
  • Q4
    Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?
    Enzymes in saliva start the digestion of starches before food is swallowed.
    Bacteria in the intestines convert dietary fiber into fats.
    Chewing in the mouth breaks food into small pieces.
    Hydrochloric acid in the stomach breaks down proteins.
    60s
    7.6

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