Which one is correct about the dicot stem?

Options

A. Pericycle consists of semilunar sclerenchymatous patches above the phloem and few layers of parenchyma alternatively
B. It does not show secondary growth
C. Endodermis is rich in starch, so this is also called starch sheath
D. a and c

Answer

To determine which statement is correct about the dicot stem, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Structure of Dicot Stem**:
- Dicot stems have a specific arrangement of tissues, including the epidermis, cortex, vascular bundles, and pith.

2. **Analyzing Option 1**:
- **Statement**: "Paricycle consists of semi-lunar sclerenchymatous patches above the phloem and few layers of parenchyma alternatively."
- **Evaluation**: This statement is correct. The paricycle in dicot stems is indeed made up of sclerenchyma patches and parenchyma layers.

3. **Analyzing Option 2**:
- **Statement**: "Paricycle consists of semi-lunar sclerenchyma patches above the phloem and few layers of parenchyma alternatively."
- **Evaluation**: This statement is identical to Option 1 and is also correct.

4. **Analyzing Option 3**:
- **Statement**: "Endodermis is rich in starch, so this is also called starch sheath."
- **Evaluation**: This statement is also correct. The endodermis in dicot stems can be rich in starch and is often referred to as the starch sheath.

5. **Analyzing Option 4**:
- **Statement**: (Incomplete, no information provided)
- **Evaluation**: Since there is no information given, we cannot evaluate this option.

### Conclusion:
Options 1, 2, and 3 are correct statements about the dicot stem. However, since the question asks for "which one is correct," and we have multiple correct options, we can conclude that Options 1, 2, and 3 are valid.