Thorns differ from prickles in

Options

A. having vascular supply
B. being modified leaves
C. lacking bark
D. All are correct.

Answer

To understand how thorns differ from prickles, we can break down the characteristics of each structure step by step.

### Step-by-Step Solution:

1. **Definition of Thorns**:
- Thorns are modified stems.
- They arise from internal tissues of the plant.
- Thorns have a vascular system, meaning they contain vascular bundles that transport nutrients and water.
- Thorns also have bark, as they originate from the stem.

2. **Definition of Prickles**:
- Prickles are not modified stems; they are outgrowths from the epidermis or outer tissues of the plant.
- They arise from external tissues, which means they do not have the same internal structure as thorns.
- Prickles lack a vascular system; they do not contain vascular bundles.
- Prickles do not have bark since they originate from the outer layer of the plant.

3. **Key Differences**:
- **Origin**: Thorns arise from internal tissues (endogenous), while prickles arise from external tissues.
- **Vascular System**: Thorns have a vascular system, whereas prickles do not.
- **Bark**: Thorns have bark due to their stem origin, while prickles lack bark.

4. **Conclusion**:
- Based on the differences outlined, we can conclude that thorns and prickles differ mainly in their origin, presence of a vascular system, and the presence of bark.

### Final Answer:
Thorns differ from prickles in that thorns are modified stems with a vascular system and bark, while prickles are outgrowths from the epidermis without a vascular system or bark.