Q3 of 51 Page 163

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___________is the strong acid which is secreted during digestion.

Hydrochloric acid (HCl) is the strong acid which is secreted during digestion.

Explanation: Hydrochloric acid is secreted in the stomach which is highly acidic and corrosive in nature. It is secreted to provide an acidic medium for the action of pepsin.


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Olfactory receptors present in ___________ trigger signals to brain.

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pH of saliva is ___________ in nature.