Question

When we cut onions then why we cry?​

Answer 1

Answer:

Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.

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Answer 2

Explanation:

because onion contains sulphur vapours which comes in contact with eyes to prevent damage of eyes the water is released in eyes