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B.O.D. is connected with...

B.O.D. is connected with

A

Organic matter

B

Microbes

C

Microbes and organic matter

D

None of the above

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding BOD**: - BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. 2. **Role of Microbes**: - Microbes, particularly aerobic bacteria, play a crucial role in breaking down organic matter in water. They require oxygen to carry out this decomposition process. 3. **Organic Matter**: - Organic matter in water comes from various sources, including sewage, agricultural runoff, and other types of waste. The presence of organic matter increases the demand for oxygen by microbes. 4. **BOD as an Indicator of Water Pollution**: - A high BOD indicates a high level of organic pollution in the water, meaning that more oxygen is needed for microbes to break down the organic matter. Conversely, a low BOD suggests less organic pollution and lower oxygen demand. 5. **Analyzing the Options**: - The options given are: - A) Organic matter - B) Microbes - C) Microbes and organic matter - D) None of the above - Since BOD is related to both the presence of organic matter and the activity of microbes, the correct answer is C) Microbes and organic matter. 6. **Conclusion**: - Therefore, BOD is connected with both organic matter and microbes, making option C the correct choice. ---
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