Which leucocyte has bean shaped nucleus `:-`

Options

A. 1)Basophil
B. 2)Monocyte
C. 3)Neutrophil
D. 4)Lymphocyte

Answer

To solve the question "Which leucocyte has a bean-shaped nucleus?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks us to identify which type of leukocyte (white blood cell) has a bean-shaped nucleus.

2. **Identify the Options**: The options provided are:
- A) Basophil
- B) Monocyte
- C) Neutrophil
- D) Lymphocyte

3. **Analyze Each Option**:
- **A) Basophil**: Basophils have a nucleus that is typically 2 to 3 lobed and can appear S-shaped. Therefore, this option is incorrect.
- **B) Monocyte**: Monocytes are large cells with a nucleus that is distinctly bean-shaped. This matches the description in the question, making this option a strong candidate.
- **C) Neutrophil**: Neutrophils usually have a nucleus that is divided into 3 to 5 lobes. They do not have a bean-shaped nucleus, so this option is incorrect.
- **D) Lymphocyte**: Lymphocytes have a nucleus that is round or slightly indented but not bean-shaped. They are also smaller compared to monocytes. Thus, this option is incorrect.

4. **Conclusion**: After analyzing all the options, the only leukocyte with a bean-shaped nucleus is the **Monocyte**. Therefore, the correct answer is option B.

### Final Answer:
**B) Monocyte**

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