Why do our eyes produce tears while cutting onions?

Options

  • A. Onion increases blood pressure
  • B. An irritating volatile compound reaches the eyes
  • C. Onion produces oxygen
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

B. An irritating volatile compound reaches the eyes

Detailed Explanation

Onion cutting releases an irritating volatile compound that reaches the eyes and stimulates sensory nerves. The nervous system responds by activating the lacrimal glands, which produce tears to dilute and remove the irritant. This is a protective reflex. The compound responsible is commonly called the lachrymatory factor of onion.
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BPSC TRE 4 General Science practice set 4

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