The level of dissolved oxygen go down after sunset because the photosynthetic activity of autotrophic organisms are reduce at sunset.
DISSOLVED OXYGEN:
- Dissolved oxygen (DO) is the amount of oxygen present in a body of water. Dissolved oxygen in an aquatic environment is increased by the photosynthetic activity of autotrophic organisms like algae, aquatic plants in the water.
- Photosynthesis, which is the process whereby some organisms obtain their food using light energy, produces oxygen as as a byproduct.
- However, at sunset, the photosynthetic activity becomes low because sunlight is required for the process to occur.
Learn more: https://brainly.com/question/12446722?referrer=searchResults
