The function of blood glands in pheretima.

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to "Pheretima," which is commonly known as the earthworm.

2. **Locate the Blood Glands**: In earthworms, blood glands are located in the 4th and 5th segments of their body.

3. **Understand the Functions of Blood Glands**:
- **Production of Blood Cells**: The blood glands are responsible for producing blood cells. These cells are phagocytic in nature, meaning they can ingest and digest debris and foreign particles.
- **Production of Hemoglobin**: The blood glands also produce hemoglobin, which is a protein that carries oxygen. This hemoglobin gets dissolved in the blood plasma, contributing to the transport of oxygen throughout the earthworm's body.

4. **Summarize the Functions**: The two main functions of the blood glands in earthworms are:
- To produce blood cells that help in the immune response by ingesting debris.
- To produce hemoglobin, which is essential for oxygen transport in the blood.