Explain Activity 6.3 NCERT class 10 science Life processes

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.

Activity 6.3 Starch without saliva turn blue with iodine
Starch without saliva turns blue with 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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