Introduction
Plant tissues are categorized based on their structure and function. Three primary types of ground tissues are parenchyma, collenchyma, and sclerenchyma, each serving unique roles in plants.

Parenchyma
- Structure: Parenchyma cells are generally thin-walled, living cells with large vacuoles and intercellular spaces. They have a simple structure and can be spherical, elongated, or irregular in shape.
- Function: These cells are primarily involved in storage, photosynthesis, and tissue repair. They make up the bulk of many plant organs, including leaves and fruits.

Collenchyma
- Structure: Collenchyma cells have unevenly thickened primary cell walls, providing flexibility and support. They are elongated and often found beneath the epidermis in stems and leaf petioles.
- Function: Collenchyma provides structural support while allowing for growth and flexibility, especially in young stems and leaves. This enables plants to withstand bending without breaking.

Sclerenchyma
- Structure: Sclerenchyma cells have thick, lignified secondary walls, making them rigid and strong. They are often dead at maturity and can be of two types: fibers and sclereids.
- Function: These cells provide structural support and protection to various plant parts. Their toughness helps plants resist external pressures and contributes to the overall strength of stems and seeds.

Summary
In summary, parenchyma, collenchyma, and sclerenchyma differ significantly in structure and function. Parenchyma focuses on storage and metabolism, collenchyma offers flexible support, and sclerenchyma provides rigidity and strength. Understanding these differences is crucial for studying plant biology.