Cells taking part in the conduction of sap are

Options

A. Sieve tubes
B. Tracheae
C. Sieve cells
D. Stone cells

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks about the cells involved in the conduction of sap in plants. Sap is a fluid that contains water, nutrients, and other substances.

2. **Identifying the Options**: The options provided are:
- Sieve tubes
- Tracheae
- Sieve cells
- Stone cells

3. **Analyzing Each Option**:
- **Sieve Tubes**: These are part of the phloem and are responsible for the translocation of sugars and carbohydrates throughout the plant. They are elongated cells that form a continuous tube.
- **Tracheae**: Also known as vessels, these are part of the xylem. They are long, cylindrical structures that transport water and nutrients from the roots to other parts of the plant.
- **Sieve Cells**: Similar to sieve tubes, these are also part of the phloem and facilitate the flow of nutrients through their pores.
- **Stone Cells**: These are a type of sclerenchyma cell that provides structural support and does not participate in sap conduction.

4. **Determining the Correct Answer**:
- The question specifically asks for cells that conduct sap. While both sieve tubes and sieve cells are involved in nutrient transport, the term "sap" generally refers to the fluid that includes water and nutrients. Tracheae (xylem vessels) are primarily responsible for transporting water and nutrients from the roots to the leaves, making them crucial for sap conduction.

5. **Conclusion**: Therefore, the cells that take part in the conduction of sap are **tracheae**.