McqMate
| Q. |
Oxygen which is vital for life is a product of photosynthesis and comes from – |
| A. | carbonates from soil |
| B. | carbon dioxide |
| C. | water |
| D. | oxides of mineral elements |
| Answer» C. water | |
|
Explanation: The unusually high concentration of oxygen has on Earth is the result of the oxygen cycle. This biogeochemical cycle describes the movement of oxygen within and between itsthree main reservoirs on Earth: the atmosphere, the biosphere, and the lithosphere. The main driving factor of the oxygen cycle is photosynthesis, which is responsible for modern Earth's atmosphere. Photosynthesis releases oxygen into the atmosphere, while respiration and decay remove it from the atmosphere. |
|
View all MCQs in
ChemistryNo comments yet