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 Dermal tissue
 Ground tissues
 Vascular tissue

 Consists of the epidermis and the
periderm
 Epidermis is a single layer of closely
packed cells
 It also covers and protects the plant

 Epidermis of the plant’s leaves secretes a
coating called cuticle
 Cuticle helps the plant retain water
 Guard cells in the epidermis regulate gas
exchange between the plants and the
environment

 It synthesize organic compounds
 Supports and provide storage for the
plant
 It is made up of Parenchyma,
Collenchyma and sclerenchyma cells

 Parenchyma cells synthesize and store
organic products in the plants
 Parenchyma cells in leaves control
photosynthesis
 Collenchyma cells have a support
function in plants

 They do not restrain growth due to their
lack of secondary cells and absence of
a hardening agent in their primary walls
 Sclerenchyma cells also have support
function in plants but they have a
hardening agent and are much more
rigid

 It is made up of xylem and phloem
 The xylem and phloem allows water and
other nutrients to be transported
throughout the plant
 Xylem is made up of two cells called
tracheids and vessel elements

 Tracheids and vessel elements form tube
shaped structures that provide pathways
for water and minerals to travel from the
roots to the leaves
 Tracheids are found in all vascular plants
 Vessels are found only in angiosperms

 Tracheids are non-living
 Phloem consists of cells called sieve
tubes and companion cells
 The cells assist in the transportation of
nutrients and sugar produced during
photosynthesis from leaves to the other
parts of the plant

 Sieve-tubes and companion cells of
phloem are living
 Companion cells contain nucleus and
actively transport sugar into and out of
the sieve tubes

http://biology.about.com/od/plantbiology
/ss/plant-tissue-systems_2.htm

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