Define ground tissue. What are their functions?

Explanation

### Step-by-Step Solution

1. **Definition of Ground Tissue**:
- Ground tissue is a fundamental tissue system in plants that forms the main bulk of the plant body. It encompasses all tissues except for the epidermis (the outer protective layer) and the vascular bundles (which include xylem and phloem).

2. **Origin of Ground Tissue**:
- Ground tissue is partly derived from the parenchyma and partly from the meristematic tissues (specifically, the cambium).

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