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

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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

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

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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

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

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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

Source

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