The humic acid of humus is neutralized in pheretima by 

Options

A. intestinal caecae
B. calciferous glands
C. typhlosole
D. buccal glands

Answer

To answer the question "The humic acid of humus is neutralized in Pheretima by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Organism**:
- Pheretima refers to the earthworm, which is known for its role in soil aeration and nutrient recycling.

2. **Identifying Humus**:
- Humus is the organic component of soil, formed from the decomposition of plant and animal matter. It contains humic acid, which can be acidic in nature.

3. **The Need for Neutralization**:
- When earthworms consume soil, they ingest humic acid along with other soil components. This humic acid needs to be neutralized to prevent harm to the earthworm's internal environment.

4. **Glands Involved in Neutralization**:
- The neutralization of humic acid in earthworms is carried out by specific glands. The options provided include:
- Intestinal CK (which secrete intestinal juices)
- Calciferous glands
- Typhlosol
- Buckle glands

5. **Identifying the Correct Gland**:
- Among the options, the **Calciferous glands** are responsible for neutralizing the humic acid. These glands secrete calcium compounds, which are basic in nature, thus neutralizing the acidic humic acid.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the humic acid of humus is neutralized in Pheretima by **Calciferous glands**.

### Final Answer:
The humic acid of humus is neutralized in Pheretima by **Calciferous glands**.

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