Which process in the oxygen cycle directly adds oxygen to the atmosphere?
Photosynthesis
In photosynthesis, green plants, algae and cyanobacteria use sunlight to convert carbon dioxide and water into glucose: 6CO2 + 6H2O → C6H12O6 + 6O2.
The oxygen released in this process (from the splitting of water) goes directly into the atmosphere, making photosynthesis the main process that replenishes atmospheric oxygen in the oxygen cycle.
Respiration, combustion and decomposition all use up oxygen and release carbon dioxide, so they remove oxygen from the atmosphere instead of adding it.
Hence, Photosynthesis.
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1. Photic conditions
2. Clean and sediment free water
3. Sea salinity of 6%
4. Tropical sea water with temperature of $20^\circ C$ to $21^\circ C$
Select the correct answer using the code given below : - NPP (Net Primary Productivity) is highest for
