Final answer:
The ground tissue is the main component of the plant body, involved in essential functions like metabolism, photosynthesis, and storage.
Step-by-step explanation:
The plant tissue that constitutes the majority of the plant body is the ground tissue. Ground tissue serves several vital functions such as carrying out basic metabolic functions, photosynthesis, and storing food and water. It is responsible for filling the interior of a plant and forms a supporting matrix for the vascular tissue, which includes the xylem and phloem that transport fluids throughout the plant. The dermal tissue, consisting of a single layer of cells called the epidermis, covers the plant and mediates interactions with the environment. Meanwhile, the vascular tissue supports the plant by transporting water, minerals, and photosynthetic products. Therefore, ground tissue plays a crucial role in the plant structure and function, comprising most of the plant body.