MCQOPTIONS
Saved Bookmarks
| 1. |
Ozone layer of the Earth's atmosphere is important for living organisms because it [NDA 2015-I] |
| A. | prevents entry of ultra -violet rays |
| B. | prevents entry of X-rays |
| C. | maintains level of oxygen on Earth |
| D. | prevents acid rain on Earth |
| Answer» B. prevents entry of X-rays | |