Q35 / 180 · NEET 2020 (Phase 1) · Botany

Snow-blindness in Antarctic region is due to

  • Correct answer
    A
    Inflammation of cornea due to high dose of UV-B radiation
  • B
    High reflection of light from snow
  • C
    Damage to retina caused by infra-red rays
  • D
    Freezing of fluids in the eye by low temperature

Solution

If the ozone layer is intact, the harmful UV-B radiation is completely absorbed by the Earth's atmosphere. UV-B causes mutation and damages DNA. It causes aging and damage to the skin and various kinds of skin cancer. In the human eye, the cornea absorbs UV-B radiation, and a higher high dose of UV-B causes inflammation of the cornea and may cause permanent damage to it. This is called snow-blindness.

Hence, the correct answer is option: 'A'.

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