Activity 6.3 NCERT class 10 science chapter 6 Life processes
Brief procedure: Activity asks us to take a starch solution in the test tube, treat it with saliva and then check for the presence of starch through iodine.
Observation: Iodine does not turn starch treated with saliva into blue colour.
Explanation: Saliva contains salivary amylase enzyme. It degrades starch into simple sugar. Iodine does not act on the simple sugar. Hence solution treated with saliva is not turned blue.
Inference: Saliva degrades the starch.
Next: Experiment to demonstrate we exhale carbon dioxide. Activity 6.4.
See also: Activity 6.2: CO2 is necessary for photosynthesis.
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