Define middle lamella. Give its chemical nature and function.

Explanation

**Step-by-Step Solution:**

1. **Definition of Middle Lamella:**
- The middle lamella is a layer that exists between the cell walls of adjacent plant cells. It acts as a boundary that separates two neighboring cells.

2. **Chemical Nature of Middle Lamella:**
- The middle lamella is primarily composed of calcium pectate and magnesium pectate. These compounds are polysaccharides that contribute to the structure and stability of the middle lamella.

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