Q. Consider the following statements about Ozone (O₃):

1. It is both a natural and a man-made product that occurs in the Earth's upper atmosphere.
2. UV-B and UV-C are absorbed by the ozone layer and the atmosphere.
3. Humans require UV-B to generate Vitamin D.

Which of the statements given above is/are correct?
Answer: 1, 2 and 3
Notes: All the statements are correct. Ozone (O₃) is both naturally and artificially present in the Earth's atmosphere. The ozone layer absorbs all UV-C and most UV-B rays, protecting living beings; while UV-A penetrates further. Humans require some UV-B for Vitamin D synthesis, but excessive exposure is harmful to health and crops.