The main cause for abundant coliform bacteria in the river Gange is

Options

A. disposal of unburnt corpses into water
B. discharge of effluents from electroplating industries
C. washing of clothes
D. immersion of ashes

Explanation

**Step-by-Step Solution:**

1. **Understanding Coliform Bacteria:**
- Coliform bacteria are a group of bacteria commonly found in the intestines of humans and animals. Their presence in water indicates contamination, particularly with fecal matter.

2. **Analyzing the Options:**
- We have four options to consider:
1. Disposal of unburnt corpses into water
2. Discharge of effluents from electroplating industries
3. Washing of bloods
4. Immersion of ashes

3. **Identifying the Main Cause:**
- Among the options, the disposal of unburnt corpses into the river is a significant concern. This practice can lead to the introduction of coliform bacteria into the water, as human remains can carry these bacteria.

4. **Evaluating Other Options:**
- While the discharge of effluents from industries and washing of bloods can contribute to water pollution, they are not directly linked to the presence of coliform bacteria as strongly as the disposal of corpses.
- Immersion of ashes does not introduce live bacteria into the water.

5. **Conclusion:**
- Therefore, the main cause for the abundant coliform bacteria in the river Ganga is the disposal of unburnt corpses into the water. Thus, the correct answer is option 1.

**Final Answer:** The main cause for abundant coliform bacteria in the river Ganga is the disposal of unburnt corpses into water (Option 1).

---