plant structures and tissues. 3 organs in vascular plants 1.roots 2.stem 3.leaves
TRANSCRIPT
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Plant Structures and Tissues
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3 Organs in Vascular plants
1. Roots2. Stem 3. Leaves
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Roots: 2 main functions
1. Anchor and support the plant in the ground
2. Absorbs water and nutrients from the soil
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Root Tissues
1. Epidermis 3. Endodermis2. Cortex 4. Vascular Cylinders
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Roots: Epidermis
Function: 1. Protects inner cells of the root2. Absorbs water and minerals
Structure:• Unicellular layer found on the outer surface of
the root• Contains root hairs: Increase the surface area of
the root and absorb water and nutrients
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Roots: Cortex
Function: 1.Cells make molecules such as starch2.Transport minerals and water from epidermis
to the central rootStructure: • Layer of cells between the epidermis and the
endodermis
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Roots: Endodermis
Function: 1. Controls the entrance of water and nutrients in
and out of the vascular cylinder2. Ensures that water does not exit the vascular
cylinderStructure:• Outer layer of endodermis called Casparian strip • Cells are coated with wax
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Roots: Vascular Cylinder
Function:1.Xylem: Transports water to the leaves of the
plant2.Phloem: Brings energy in the form of glucose
to the root
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Stems: 2 main functions
1. Holds leaves up towards sunlight2. Conducts substances between roots and
leaves
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2 Types of Stems
1. Herbaceous Stems 2. Woody Stems- Do not Survive the winter -Survive the winter
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Herbaceous Stems
• Do not survive the winter• Composed of vascular bundles (collections of
xylem and phloem) surrounded by an epidermis
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Woody Stems- 5 layers
1. Cork – Outer layer of tree (bark)
2. Phloem3. Vascular Cambium– Layer where a new layer of xylem and phloem are
produced every year4. Sapwood– Recent layer of xylem
5. Heartwood– Layers of previous years xylem – Responsible for annual rings
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Woody Stems- 5 Layers
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Leaves
• Responsible for making sugars through photosynthesis: CO2 + H2O + light C6H12O6 + O2
• Location of chloroplast
• Designed to have maximum sunlight exposure
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Leaf Tissues
1. Epidermis 2. Mesophyll3. Veins
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Leaves: Epidermis
Function: 1. Provides a protective barrier for inner leaf tissues2. Water-proof the leaf3. Studded with stomata which are responsible for
gas exchangeStructure:• Cuticle: outermost waxy layer of epidermis• Studded with stomata (singular-stoma)
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Leaves- Stoma
Function:1.Allow Oxygen and water vapor to leave the
plant2.Allows Carbon Dioxide to enter the plant3.Stoma stay open during the day (let CO2 in)
and close at night (to prevent water loss)4.Stomata close when it is very hot or if there is
a lack of water in the soil
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Leaves- Stoma
Structure:• Made up of 2 guard cells (specialized kidney-shaped
epidermal cells)• During the day ions moveinto guard cells resulting in a flow of water into the cell. This results in the opening of the stomata. • During the night the ions and water leave the guard cells causingthe stomata to close
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Leaves- Mesophyll
Function:• The location where photosynthesis occurs• Site where gas exchange occurs within the leaf
Structure:2 layers of cells:1. Palisade layer: densely packed cells responsible for
photosynthesis 2. Spongy layer: Less densely packed cells responsible for
gas exchange (absorb CO2 and release O2)
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Leaves- Veins
Function:Vascular bundles in leaves that transport water
to leaves and retrieve glucose made in the leaves
Structure:The xylem and phloem are branched through
the mesophyll portion of the leaf
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Now that we’ve talked about the organs… Let’s learn more
about the tissues!
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3 types of Tissues in Vascular Plants
1. Vascular Tissues2. Ground Tissue3. Meristematic Tissue
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Vascular Tissue- Xylem (water transport)
Function: Transports water from roots to leaves
Structure: 2 Types of Xylem Cells: 1. Vessel elements
• Only found in angiosperms• Vessel elements connect end to end• Ends are absent or perforated
2. Tracheids• Found in all vascular plants• Narrower than vessel elements with pointy ends
*Both types of Xylem cells are dead at maturity!
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Vascular Tissue- Phloem Cells
Function: Transports water and dissolved sugars from leaves to other parts of the plant
Structure:Made up of Sieve tube cells• Alive at maturity• Sieve plates at end of each cell• Cells lack a nucleus at maturity• Each sieve cell is connected to a companion cellwhich directs its operation
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Ground Tissue3 types of ground tissue:1. Parenchyma: – Found in roots, stems, and leaves of plants– Location where photosynthesis occurs– Storage for food and water
2. Collenchyma:– Thickened cell walls provide plant with support (ex.
Cellery stalks)3. Schlerenchyma:– Thickened cell walls provide plant with further support
(ex. Shell of a nut)– Dead at maturity
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Meristematic Tissue
• Type of tissues that produces new cells by mitosis• Plant can only grow in regions with
meristematic tissueApical Meristems:-located at ends of root and stems -responsible for primary growth of plant
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Homework
Pg. 545 Q: 1, 2, 4,