3. Light emitted by sun reaches earth in:
(a) 8 minutes and 30 seconds(b) 10 minutes and 30seconds(c) 12 minutes and 30 seconds(d) 15 minutes and 30seconds.
3. Light emitted by sun reaches earth in: Read More »
2. Which of the following chemicals is responsible for the depletion of ozone layer inthe atmosphere?
(a) Chlorofluorocarbons(b) Nitrous oxide(c) Sulphur oxide(d) Carbon oxide
1. Which of the following terms is used for several individuals of a species living together in a locality?
(a) Biosphere(b) Bio-community(c) Ecosystem(d) Population