The answer is ground tissue.
Plants have 3 types of tissues - dermal, vascular, and ground tissue. Ground tissue includes parenchyma, collenchyma, and sclerenchyma.
Parenchyma has a role in photosynthesis, storage. It also makes the bulk of ground and vascular tissue.
The function of sclerenchyma and parenchyma is support and strength of roots, stems, and leaves.