is clear
is highly polluted
contain Algae
contain many dissolved minerals
Answer is Wrong!
Answer is Right!
The correct answer is: B. is highly polluted.
BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that is used up by microorganisms in the water to break down organic matter. A high BOD indicates that there is a lot of organic matter in the water, which can be caused by pollution from sewage, industrial waste, or agricultural runoff. This organic matter can deplete the oxygen levels in the water, which can kill fish and other aquatic life.
The other options are incorrect because:
- A. Clear water does not necessarily mean that it is clean. Water can be clear but still contain pollutants.
- C. Algae are a type of plant, and plants do not use up oxygen in the water. In fact, algae can produce oxygen during photosynthesis.
- D. Dissolved minerals do not affect the BOD of water.