HARITHA,Subject Matter Expert at Edumarz
Solution:The complex tissues are formed of more than one type of cell and these cells function together as a unit.Xylem and phloem are the complex tissues present in plants.They constitute the complex tissues in plants.
Xylem
The main function of xylem tissue is conducting tissue for water and minerals from roots to the stem and leaves and it also provides mechanical strength to different plant parts
It is formed of four types of elements: tracheids, vessels, xylem fibres, and xylem parenchyma.Tracheids are elongated or tube-like cells with thick and lignified walls and tapering ends.They also lack protoplasm.
Vessels are long cylindrical tube-like structures formed of many cells called vessel members
Xylem fibres are characterised by highly thickened walls
Xylem parenchyma cells are living,thin-walled cells and their cell walls are composed of cellulose
The primary xylem is present in two forms called protoxylem and metaxylem
Phloem
The main function of phloem tissue is the transport of food materials mainly from leaves to other parts of the plant
In angiosperms, phloem is formed of sieve tube elements,companion cells, and phloem parenchyma
Gymnosperms contain albuminous cells and sieve cells but they lack sieve tubes and companion cells.