Concentration of dissolved oxygen in water is determined by: (A) Turbulence (B) Temperature (C) Concentration of oxygen in atmosphere (D) Activity of organism (E) Genetic diversity
Choose the correct answer from the options given below:

Correct option is A

Explanation:
Dissolved oxygen (DO) levels in water are influenced by various physical and biological factors:
· (A) Turbulence: Increases surface mixing and enhances oxygen dissolution from the atmosphere into water.
· (B) Temperature: Affects the solubility of oxygen — colder water holds more oxygen.
· (C) Atmospheric oxygen concentration: Higher oxygen content in air enhances diffusion into water.
· (D) Activity of organisms: Respiration by aquatic organisms reduces DO, while photosynthetic activity by algae and aquatic plants increases DO.
· (E) Genetic diversity: Does not directly influence DO levels; it is more related to ecosystem health and resilience.
Information Booster:
Dissolved oxygen is crucial for the survival of aquatic life. Its concentration:
· Should be above 5 mg/L for healthy ecosystems.
· Can be reduced by organic pollution, leading to eutrophication.
· Is measured using Winkler's method or electronic DO meters.
In stagnant water with high temperature and biological demand, DO levels tend to drop, affecting aquatic organisms.