Which one of these specifically are called stone cells

Options

A. Fibrosclerieds
B. Macrosclerieds
C. Osteosclerids
D. Brachysclerids

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of cells are specifically referred to as "stone cells."

2. **Identifying the Options**: The options provided are:
- Fibrosclerides
- Macrosclerides
- Osteosclerides
- Brachysclerides

3. **Defining Each Option**:
- **Fibrosclerides**: These are non-living cells that provide support to plants. They have thickened cell walls due to lignin deposition.
- **Macrosclerides**: These are rod-shaped sclerites found in the outer layer of seed coats, particularly in leguminous plants. They have thick secondary walls and no lumen.
- **Osteosclerides**: Also known as bone cells, these form the hypodermal layer in seeds, fruits, and leaves, particularly in dicots.
- **Brachysclerides**: These are roughly round sclerites found in certain fruits. They contribute to the gritty texture when eating certain fruits like pears.

4. **Identifying Stone Cells**: The transcript indicates that the "gritty things" found in pears are due to "stone cells," which are specifically identified as **brachysclerides**.

5. **Conclusion**: Therefore, the cells specifically referred to as "stone cells" are **brachysclerides**.

### Final Answer:
**Brachysclerides** are specifically called stone cells.

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