Oxygen cycle pres 1
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Oxygen is a tasteless and odorless gas that comprises 22% of the air and supports combustion. It is essential for photosynthesis, which converts carbon dioxide and water into oxygen and carbohydrates like sugars to chemically store energy from sunlight in plants, algae and cyanobacteria. The oxygen cycle describes its movement through three main reservoirs: the atmosphere, biosphere, and lithosphere. Failure of the oxygen cycle in the hydrosphere can create hypoxic zones with low oxygen levels harmful to marine life.
Oxygen cycle pres 1
- 1. Oxygen:
- 2. Is a chemical element with symbol O and atomic number 8. Tasteless gas. Has no smell nor color. Comprises 22% of the air. Supports combustion.
- 3. Is the biogeochemical cycle that describes the movement of oxygen with its three main reservoirs : 1. Atmosphere 2. Biosphere 3. Lithosphere
- 5. NB : Failure in the oxygen cycle within the hydrosphere can result in the development of Hypoxic zones. Hypoxic zones- This is a condition caused by excessive nutrient pollution from human activities coupled with other factors which in turn deplete or lowers the oxygen level required by marine life.
- 7. Photosynthesis : Is a process used by plants and other organisms to convert light energy into chemical energy that can be later released to fuel the organisms activities. This chemical energy is stored in carbohydrate molecules such as sugars which are synthesized from carbon dioxide and water. Photosynthesis is derived from a Greek word Phõs -“light” and Synthesis– “putting together”. Most plants, Algae and Cynobacteria perform photosynthesis and they are referred to as Autotrophs. Photosynthesis is responsible for the modern earth’s atmosphere and life on earth.
- 8. 6CO2 + 6H2O + Energy C6H12O6 + 6O2
- 9. Used : To make acids (sulfuric, nitric acid) and other compounds. For boosting reaction rates and oxidation of unwanted compounds. In medicine and healthcare institutions. To generate energy. For destroying rocks in mining.
- 10. Soil: This are the air spaces present in the soil. This are the air spaces present in the soil.. Its composition is 20%.
- 11. Water : Oxygen in water is known as dissolved oxygen . Oxygen enters the water from the atmosphere as it dissolves and mixes into the water surfaces. Oxygen uptake rate (O.U.R.) is the rate at which oxygen is consumed by living organisms in the water.
- 12. It appears as water bubbles.
- 13. NB: Question me after the class please!!!! Conserve as much as you can!!!
- 14. Paulus N. Nakashole 16 March 2014