complex tissue Flashcards
complex tissue consist of——-
Xylem and phloem
Function of xylem
conducting water and minerals
Xylem functions as a conducting tissue for water and muneral from roots stem and leaves.
What is the other function of xylem other than conducting water
provide mechanical strength
How many type of element are require to compose xylem
four
Trachieds , vessels , xylem fibers and xylem parenchyma
Name the four elements of xylem
Trachieds , vessels , xylem fibers and xylem parenchyma
Which phylum lack vessels in their xylem
Gymnosperm
Structure of tracheids cells
Elongated or tube like cells
Tracheids are elongated or tube like cells with thick and lignified walls and tapering end
Dead element of xylem
Tracheids
These are dead and without protoplasm
Which are the main water transporting elements in Angiosperm
Trachied
Vessel members
vessel is a long cylindrical tube like structure made up of many cells called vessel members
Each with lignified walls and large central cavity
* The vessels cells are devoid of protoplasm
* Vessels members are connected through perforation in their common walls
Presence of vessels is a charateristic freatures of which phylum
Angiosperm
The chief water conducting element of xylem in gymnosperms
Tracheids
Xylem fibers
Have highly thickened walls and obliterated central lumems
These may either be septate or aseptate
Xylem parenchyma
Cells are livingand thin walled, and their cell walls are made up of cellulose
Function of xylem parenchyma
They store food
They store food materials in the form of strach or fat and other substances like tannins
