Download Plant Tissues

Lecture 3
Plant Tissues
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Plant organs:
A plant has two organ systems:
1) the shoot system,
2) the root system.
The shoot system is above
ground and includes the
organs such as leaves, buds,
stems, flowers and Fruits.
The root system includes
the parts of the plant below
ground, such as the roots
and tubers.
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Plant Tissues:
Plant cells are formed at meristems, and then
develop into Permanent tissues that are of 3
types
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Plant Tissues:
Meristematic Tissues:
This tissue is composed of relatively small cells
with thin walls and large nuclei and small
vacuoles.
Its main function is division and growth.
The production of new cells is confined to
certain areas of the plant known as Apical
Meristems that are present in the tops of the
roots and stems.
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Plant Tissues:
Meristematic Tissues:
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Plant Tissues:
Meristematic Tissues:
Apical meristem in stem
Apical meristem in root
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Plant Tissues:
Permanent tissues: are of 3 types:
Permanent
Tissues
Dermal tissue
system
- Epidermis
Ground tissue system
Vascular
- Paranchyma tissue
tissue system
- Collenchyma tissue
- Xylem tissue
- Sclerenchyma tissue
- phloem tissue
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Permanent tissues:
Dermal tissues:
Epidermis: It is the outer layer of cells in leaves,
stems and roots.
It consists of one layer of striated circular cells and
covered externally by cuticle and associated with
pores .
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Permanent tissues:
Dermal tissues:
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Permanent tissues:
Ground tissues:
Ground
Tissues
Paranchyma
tissue
Collenchyma
tissue
Sclerenchyma
tissue
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Ground tissues:
Parenchyma Cells:
Spherical cells with thin, cell walls and a large central
vacuole, located below the epidermal tissue
Function: Food production and Storage.
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Ground tissues:
Collenchyma:
They have thick wall, cell walls thicker in corners
Function: Support and food production
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Ground tissues:
Sclerenchyma :
They have very thick secondary wall
Function: Support only
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Permanent tissues:
Vascular Tissues:
Vascular
tissues
Xylem
Phloem
Vascular tissues consisting of cells joined into tubes that
transport water and nutrients throughout the plant body.
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Permanent tissues:
Vascular Tissues:
Xylem tissue
It is responsible for transporting water and salts from
root to leaves.
Phloem tissue
It is responsible for transporting food from leaves that
produced by photosynthesis to all plant organs.
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Xylem Tissues
Xylem
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Phloem Tissues
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Xylem & Phloem Tissues
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Exercise:
Match the sentences
1- Vascular tissue responsible for the transport of nutrients and the
Sclerenchyma
carbohydrates produced by photosynthesis, moves in all directions
Phloem
2- Plant tissue consisting of cells joined into tubes that transport
water and nutrients throughout the plant body.
Epidermis
3- Spherical plant cells with thin, cell walls and a large central
vacuole; important for storage and food production.
Xylem
4- Type of ground tissue, builds very thick secondary cell walls.
Vascular
tissue
5- Cells in ground tissue flexible for support, cell walls thicker in
corners
6- The dermal tissue system, usually consisting of a single layer of
Parenchyma
cells
Meristematic 7- Cells that transports water and dissolved minerals upwards from
roots to stems to leaves
Tissue
8- Cells are actively dividing cells, located in the tips of roots and
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Collenchyma
shoots in young seedlings.