The Ground Tissue System constitutes the bulk of the plant body.

Ground tissue is one of the three tissue systems in plants, along with the epidermal tissue system and the vascular tissue system. It is responsible for performing various functions, including support, storage, and photosynthesis. The ground tissue system is found in all parts of the plant body, including the roots, stems, leaves, and even fruits.

Functions of the Ground Tissue System:

1. Support: The ground tissue system provides mechanical support to the plant body. It consists of cells with thick cell walls that give strength and rigidity to the plant. The ground tissue system is especially important in the stems and roots, where it helps maintain the upright position of the plant and provide structural support.

2. Storage: Ground tissue often serves as a storage site for various substances, including water, nutrients, and carbohydrates. Parenchyma cells, a type of ground tissue, can store starch and other energy-rich compounds. This stored material can be utilized during periods of growth, development, or when the plant is under stress.

3. Photosynthesis: Some cells of the ground tissue system, specifically the mesophyll cells in leaves, are responsible for photosynthesis. These cells contain chloroplasts, which capture sunlight and carry out the process of photosynthesis to produce glucose, the plant's source of energy.

4. Gas Exchange: Another important function of the ground tissue system is facilitating gas exchange. The spongy mesophyll cells in leaves have air spaces between them, allowing for the diffusion of gases such as carbon dioxide and oxygen. This enables the plant to take in carbon dioxide for photosynthesis and release oxygen as a byproduct.

5. Wound Healing: Ground tissue plays a role in wound healing and tissue repair. When a plant is injured or damaged, the ground tissue cells near the site of injury can undergo cell division and differentiation to replace the damaged tissues.

Conclusion:

In summary, while all three tissue systems are essential for the overall functioning of a plant, the ground tissue system constitutes the bulk of the plant body. It provides support, storage, and photosynthesis, and is found in all parts of the plant. The ground tissue system is crucial for the growth, development, and survival of plants.