Why the endodermis in dicot stem is also referred to as the starch sheath?

Explanation

### Step-by-Step Solution:

1. **Definition of Endodermis**: The endodermis is the innermost layer of the cortex in a dicot stem. It serves as a boundary between the cortex and the vascular tissue.

2. **Cell Structure**: The cells of the endodermis are compactly arranged and are barrel-shaped. This arrangement leads to a lack of intercellular spaces, meaning that the cells fit tightly together without gaps.

3. **Wavy Appearance**: The endodermis has a wavy structure, which is a characteristic feature of its cellular arrangement.

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