Resin ducts of Cedrus are mostly present in

Options

A. Epidermis
B. Cortex
C. Pericycle
D. Pith.

Answer

To solve the question regarding where the resin ducts of Cedrus are mostly present, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: Recognize that Cedrus (commonly known as cedar) is a genus of trees that belongs to the gymnosperms. Gymnosperms are known for having certain structural features, including resin ducts.

2. **Identify the Structure of Resin Ducts**: Resin ducts are specialized structures within plants that are typically thick-walled and lignified. Their primary function is to store and transport resin, which is a sticky substance that can protect the plant from pests and pathogens.

3. **Examine the Options**: The question provides four options where resin ducts could be located:
- A. Apodermis
- B. Cortex
- C. Pericycle
- D. Pith

4. **Analyze Each Option**:
- **Apodermis**: This is the outer layer of the plant, often involved in protection but not primarily associated with resin ducts.
- **Cortex**: This is the layer between the epidermis and the vascular tissues. It is known to contain resin ducts in gymnosperms like Cedrus, as it can provide storage and support.
- **Pericycle**: This layer is involved in the formation of lateral roots and does not typically contain resin ducts.
- **Pith**: The central part of the stem, primarily involved in storage and transport, but not associated with resin ducts.

5. **Conclusion**: Based on the analysis, the resin ducts of Cedrus are mostly present in the **Cortex**. Therefore, the correct answer is option **B**.

### Final Answer:
The resin ducts of Cedrus are mostly present in **B. Cortex**.

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