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