Large plant cells are

Options

A. Xylem vessel cells
B. Parenchyma cells
C. Sieve tube cells
D. Sclerenchyma fibres

Answer

To answer the question "Large plant cells are," we need to analyze the options provided:

1. **Xylem vessel cells**: These are specialized cells involved in the transport of water and minerals from the roots to the rest of the plant. While they can be large, they are not the largest type of plant cells.

2. **Parenchyma cells**: These are the most common type of plant cells and can vary in size. They are involved in storage, photosynthesis, and tissue repair, but they are not specifically known for being large.

3. **Sieve tube cells**: These are part of the phloem and are responsible for the transport of nutrients. They are elongated but not necessarily the largest cells in plants.

4. **Sclerenchyma fibers**: These cells provide structural support to the plant. They are typically large, have thickened secondary walls, and are often dead at maturity. They are known for their rigidity and strength, making them one of the largest types of cells in plants.

Based on this analysis, the correct answer is:

**D. Sclerenchyma fibers**

### Step-by-Step Solution:
1. **Identify the types of plant cells**: Review the options given (xylem vessel cells, parenchyma cells, sieve tube cells, sclerenchyma fibers).
2. **Analyze each type**: Determine the characteristics and functions of each cell type.
3. **Compare sizes**: Assess which of the cell types is known for being large.
4. **Conclude with the correct answer**: Identify that sclerenchyma fibers are the largest among the options.