Digestive System Overview
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Questions and Answers

What is a common evidence for being alive according to the text?

  • Sleeping
  • Breathing
  • Visible movement (correct)
  • Eating
  • Why do some people think plants are alive?

  • They grow over time (correct)
  • They are green
  • They are stationary
  • They have colorful leaves
  • What characteristic of life is NOT solely based on visible movement according to the text?

  • Breathing
  • Sleeping (correct)
  • Eating
  • Growth
  • Why is there controversy about whether viruses are truly alive?

    <p>They lack molecular movement</p> Signup and view all the answers

    What kind of movement is mentioned as invisible but necessary for life by professional biologists?

    <p>Molecular movements</p> Signup and view all the answers

    Why is it mentioned that a plant that is not visibly growing is still alive?

    <p>It grows over time</p> Signup and view all the answers

    What is the main function of peristaltic movements in the digestive tube?

    <p>Regulate the movement of food along the digestive tube</p> Signup and view all the answers

    How does the stomach expand when food enters it?

    <p>By contracting its walls rhythmically</p> Signup and view all the answers

    What is the role of gastric glands in the stomach?

    <p>Create an acidic medium for enzyme action</p> Signup and view all the answers

    How does dental caries or tooth decay begin?

    <p>By softening or demineralising enamel</p> Signup and view all the answers

    What is the function of mucus in the stomach?

    <p>Protect the inner lining from acid action</p> Signup and view all the answers

    Which enzyme is responsible for protein digestion in the stomach?

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

    What is the function of chloroplasts in a leaf cell?

    <p>Converting light energy into chemical energy</p> Signup and view all the answers

    What is the purpose of keeping a potted plant with variegated leaves in a dark room for three days before conducting the activity?

    <p>To ensure all the starch in the leaves gets used up</p> Signup and view all the answers

    What is the purpose of dipping the leaf in boiling water and then immersing it in alcohol during the activity?

    <p>To prepare the leaf for iodine staining</p> Signup and view all the answers

    What does boiling alcohol in a water bath after immersing the leaf help achieve?

    <p>Removing excess alcohol from the leaf</p> Signup and view all the answers

    What conclusion can be drawn if after iodine staining, green areas on the leaf turn blue-black?

    <p>There is no starch present in those areas</p> Signup and view all the answers

    How does keeping a potted plant with variegated leaves in sunlight for six hours help demonstrate the role of chlorophyll in photosynthesis?

    <p>It promotes chlorophyll synthesis and thus starch production</p> Signup and view all the answers

    Where does the breakdown of glucose into pyruvate take place?

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

    Which molecule is formed by the breakdown of pyruvate in yeast during fermentation?

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

    What is the term used for the process of breaking down pyruvate into lactic acid when oxygen is lacking in muscle cells?

    <p>Anaerobic respiration</p> Signup and view all the answers

    In which organelle does the breakdown of pyruvate into carbon dioxide take place using oxygen?

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

    Which type of respiration releases a greater amount of energy, aerobic or anaerobic?

    <p>Aerobic respiration</p> Signup and view all the answers

    What causes muscle cramps during sudden activity due to the build-up of lactic acid?

    <p>Build-up of lactic acid</p> Signup and view all the answers

    Why is it important to brush teeth after eating?

    <p>To remove plaque before bacteria produce acids</p> Signup and view all the answers

    Which part of the alimentary canal is the longest?

    <p>Small intestine</p> Signup and view all the answers

    Why do herbivores need a longer small intestine compared to carnivores?

    <p>To allow cellulose digestion</p> Signup and view all the answers

    What is the role of bile juice from the liver in digestion?

    <p>Emulsifying fats</p> Signup and view all the answers

    Why does the food coming from the stomach need to be made alkaline in the small intestine?

    <p>To facilitate pancreatic enzyme activity</p> Signup and view all the answers

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