Dry scales of Onion possess in their cells

Options

A. Raphides
B. Prismatic crystals
C. Sphaeraphides
D. Crystal sand

Answer

To answer the question "Dry scales of Onion possess in their cells," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what is present in the cells of dry scales of onion. We need to identify the specific type of crystal or structure that is formed in these cells.

2. **Analyzing the Options**:
- **Rephides**: These are needle-shaped crystals of calcium oxalate found in some plant cells. They are not typically associated with onion scales.
- **Prismatic Crystals**: These are rod-shaped crystals of calcium oxalate that are formed in the cells of certain plants, including onion scales.
- **Spherophytes**: These are star-shaped crystals of calcium oxalate found in specific plants, such as the phylo clathes of Colocasia. They are not found in onion scales.
- **Crystal Sand**: This refers to the deposition of calcium oxalate in the vacuoles of leaves during developmental stages, seen in plants like beetroot. This is not relevant to onion scales.

3. **Identifying the Correct Answer**: Based on the analysis, the dry scales of onion specifically contain prismatic crystals, which are formed due to the deposition of calcium oxalate.

4. **Conclusion**: Therefore, the correct answer to the question is **Option 2: Prismatic Crystals**.