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Question
Given below are the groups of certain substances of particular categories. Mention the category of each group and identify the wrong example giving reason.
Tears, skin, nasal secretion, HCl (in stomach)
Solution
Tears, skin, nasal secretion, HCl (in stomach)
Germ-killing secretions. Skin is a wrong example as it is a protective mechanical barrier and prevents the entry of germs in our body.
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