Some Tissues in the Plant Body
Xylem
Involved in conduct of water and ions in the plant
Typically composed of non-living conductive cells and living parenchyma cells
Conductive cells have thick secondary cell walls, often deposited unevenly in a coil-like pattern so that they may stretch
Dead at functional maturity
Two types of conductive cells- tracheids and vessels
Tracheids - long, slender cells connected to each other by pits. Found in all vascular plants
Vessels - shorter, larger diameter cells with completely perforated cell wall ends. Found only in Angiosperms
Xylem Parenchyma arranged in rays
Xylem parenchyma are also distributed throughout the tracheids and vessel elements
Phloem
Involved in transport of sucrose, other organic compounds, and some ions
Conductive cells living at functional maturity
Protoplast may lack organelles and nucleus, though
Endwalls connect to each other via sieve-plates
Two types of conductive cells in the phloem - sieve-tube members and companion cells
Sieve-tube members - actual conduit for sucrose transport
Companion cells - has a nucleus that may also control the sieve-tube element and may aid in sucrose loading
Sclerenchyma tissue is often associated with phloem
Dermal Tissue
Generally a single layer of cells
The "skin" of the plant
Primarily parenchyma cells
Main role is protection of the plant
Ground Tissue
Makes up the bulk of the plant
Predominately parenchyma, but collenchyma and schlerenchyma cells are found
Diverse functions including photosynthesis, storage, and support
Pretty much, if you look at something and it isn't dermal tissue nor is it vascular tissue, it is ground tissue