For biogas production, besides dung, an extensive use of which weed is recommended in our country?

Options

A. Mangifera indica
B. Hydrilla
C. Eichhornia crassipes
D. Solanum

Answer

To answer the question regarding which weed is extensively used for biogas production in addition to dung, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: Understand that the question is asking about biogas production, which typically utilizes organic materials, including animal dung.

2. **List Common Weeds Used**: Recall that certain weeds can be beneficial for biogas production due to their composition. The video mentions several plants.

3. **Focus on the Relevant Weed**: The video specifically highlights water hyacinth, scientifically known as *Eichhornia crassipes*, as a significant weed used alongside dung for biogas production.

4. **Explain the Reason for Its Use**: Water hyacinth is chosen because it contains a high amount of hemicellulose, which is a polysaccharide that aids in the fermentation process necessary for biogas production.

5. **Conclude with the Correct Answer**: Therefore, the weed that is extensively used for biogas production in addition to dung is *Eichhornia crassipes* (water hyacinth).

### Final Answer:
The extensive use of water hyacinth (*Eichhornia crassipes*) is recommended in our country for biogas production, alongside dung.

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