Download - Plant tissues slides
Plant tissuesDescriptions and functions
Plant tissues
Plant tissues
Types of plant tissues
Dermal tissue Ground tissues Vascular tissue
Dermal tissue
Dermal tissue
Consists of the epidermis and the periderm
Epidermis is a single layer of closely packed cells
It also covers and protects the plant
Continuing…
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
Ground tissue
ground tissue
It synthesize organic compounds Supports and provide storage for the
plant It is made up of Parenchyma,
Collenchyma and sclerenchyma cells
Continuing…
Parenchyma cells synthesize and store organic products in the plants
Parenchyma cells in leaves control photosynthesis
Collenchyma cells have a support function in plants
Continuing…
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
Vascular tissue
Vascular tissue
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
Continuing…
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
continuing
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
Continuing…
Sieve-tubes and companion cells of phloem are living
Companion cells contain nucleus and actively transport sugar into and out of the sieve tubes
Source
http://biology.about.com/od/plantbiology/ss/plant-tissue-systems_2.htm