In Pheretima oxygen carrying haemoglobin occurs in

Options

A. Corpuscles
B. Plasma
C. Both corpuscles and plasma
D. The statement is wrong

Answer

To answer the question regarding where oxygen-carrying hemoglobin occurs in Pheretima, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understand the Organism**:
- Pheretima is a genus of earthworms. It is important to know the basic biology of earthworms to understand their circulatory system.

**Hint**: Recall that Pheretima belongs to the group of organisms known as annelids, which have a segmented body structure.

2. **Identify the Blood Components**:
- In earthworms, blood consists of two main components: blood cells (corpuscles) and plasma (the fluid portion).

**Hint**: Remember that plasma is the liquid medium in which blood cells are suspended.

3. **Locate Hemoglobin**:
- Hemoglobin is the protein responsible for carrying oxygen. In Pheretima, hemoglobin is produced in blood glands located on specific segments (4th, 5th, and 6th segments).

**Hint**: Think about where proteins like hemoglobin are typically synthesized in organisms.

4. **Determine Where Hemoglobin is Found**:
- Hemoglobin in Pheretima is dissolved in the blood plasma, which means that while hemoglobin is produced in the blood glands, it is not contained within the blood corpuscles but rather in the plasma.

**Hint**: Consider the difference between hemoglobin being produced and where it is actually found in the blood.

5. **Analyze the Options**:
- The options provided were:
- A) Corpuscles
- B) Plasma
- C) Both corpuscles and plasma
- D) The statement is wrong
- Since hemoglobin is dissolved in plasma, the correct answer is that hemoglobin occurs in plasma.

**Hint**: Eliminate options that do not align with the understanding that hemoglobin is found in the fluid component of blood.

### Final Answer:
The correct answer is **plasma**.