PLANT TISSUES

Tissue:

• A tissue is an ensemble of similar cells from the same origin that together carry out a specific function

Cells tissuesform to

Plant Tissues

We are going to focus on Angiosperms. In general,

they have 4 types of tissues;

• Meristem tissue

• Ground tissue

• Vascular tissue

• Dermal tissue3

Meristem Tissue

• Meristem tissue are found in growth regions of plants.

• They could be divided.They occur mitotic division during the their life.

• They could be formed new cells.

• They have a capability of occuring various tissues.

• So let’s say;

• There are 3 types of tissue which all derive from meristematic tissue;

• Dermal tissue

• Ground tissue

• Vascular tissue

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Dermal Tissue

• The dermal tissue system protects the soft tissues of plants and controls interactions with the plants' surroundings.

• It can be thought of as the plant's "skin."• The epidermis is a dermal tissue that is usually

a single layer of cells covering plants' leaves, flowers, roots and stems.

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Dermal tissue can be differentiate into specialized formation. These are;• Hydathode• Trichome • Thorns• Stomata

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Hydathode;

Hydathode is the pore that

provide disposing of the

excess water as the liquid

when there is no sweats at

night or when the air is

saturated with moisture.

Trichome; • They play a role in

protecting the plant from predators and the disease‐causing organisms they carry (Glover,1990).

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Thorn;

• They with the function of mechanically deterring herbivory.

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Stomata;

• Stomatal guard cells are essential to keep one particular component inside the plant—water. However, they must also allow the gaseous exchange essential for photosynthetic activity (Glover,1990).

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Ground tissue• The ground tissue of plants can be divided into

three classes;ParenchymaLocated in every organ of the plantStorage of food and water,ventilation among of tissues

Collenchymamechanical support

Sclerenchymathick cell wall,mechanical support

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• The ground tissues of plants could be seen whole parts of plants.

• They provide structural support.

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Vascular tissue

They perform transportation of water and minerals in plants.

Vascular tissues include the xylem and phloem, both of which are conductive tissues.

Xylem ;

• They carry water and minerals from root to top of

plants

• They occur with dead cells

• They are composed many cell types.Tracheids and

vessel elements largely involved in water and

mineral.

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Phloem;

• Phloem is the living tissue

• Phloem carries organic nutrients

such as sucrose to all parts of

the plant where needed.

• The movement of organic

molecules in plants is called

translocation.20

Resources

• http://bcs.whfreeman.com/thelifewire8e/bcs-pages/body-right_10.asp?s=34000&n=00010&i=34010.01&v=chapter&o=%7C00010%7C&ns=0

• http://www.phschool.com/science/biology_place/biocoach/plants/dermal.html

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