1. Name the constituents of air.
1. Name the constituents of air.2. What is the proportion of nitrogen in air?
3. What is the proportion of oxygen in air?
4. Of what use is carbon dioxide to plants?
5. What is meant by nitrogen fixation?
6. How does nitrogen fixation happen?
7. What function does an observatory perform?
8. What causes greenhouse effect?
9. What is found in clouds and mist?
10. What is used in aerated drinks?
11. What is used in electric bulbs?
12. What is used to obtain very low temperatures?
13. What is used in the production of nitric acid?
14. What is mandatory to treat before letting them out?
Originally posted 2015-11-24 11:35:18.