What is the role of the acid in our stomach?

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(D) The hydrochloric acid $(HCl)$ present in our stomach serves several critical functions:$1$. It creates an acidic medium ($pH$ of $1.5$ to $3.5$) w

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All of the above.

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(D) The hydrochloric acid $(HCl)$ present in our stomach serves several critical functions:$1$. It creates an acidic medium ($pH$ of $1.5$ to $3.5$) which is essential for the activation of the enzyme pepsinogen into its active form,pepsin.$2$. Pepsin is a proteolytic enzyme that breaks down complex proteins into simpler peptides.$3$. The acidic environment also acts as a defense mechanism by killing harmful bacteria and pathogens ingested along with food.Therefore,all the given options are correct.

Group $(A)$	Group $(B)$
$(a)$ Autotrophic nutrition	$(i)$ Leech
$(b)$ Heterotrophic nutrition	$(ii)$ Paramecium
$(c)$ Parasitic nutrition	$(iii)$ Deer
$(d)$ Digestion in food vacuoles	$(iv)$ Green plant

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Match Group $(A)$ with Group $(B)$:
Group $(A)$ Group $(B)$
$(a)$ Autotrophic nutrition $(i)$ Leech
$(b)$ Heterotrophic nutrition $(ii)$ Paramecium
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$(d)$ Digestion in food vacuoles $(iv)$ Green plant

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