Inner bark is mainly composed of

Options

A. secondary xylem
B. secondary phloem
C. cork cambium
D. phellogen

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Bark**: The bark of a tree is divided into two main parts: the outer bark and the inner bark. The outer bark is primarily made up of dead tissues, which serve as a protective layer for the tree.

2. **Identifying the Inner Bark**: The inner bark, also known as the phloem, is located beneath the outer bark. It is responsible for transporting nutrients and food produced by the leaves through photosynthesis.

3. **Composition of Inner Bark**: The inner bark is mainly composed of secondary phloem. This tissue is vital for the conduction of food throughout the plant.

4. **Conclusion**: Therefore, the inner bark is mainly composed of secondary phloem, which plays a crucial role in the plant's nutrient transport system.

### Final Answer:
The inner bark is mainly composed of **secondary phloem**.

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