Transcript
DermalVascularGround
Plant Biology Part 2 - Tissues
Plant Tissue
Dermal Tissue
Vascular Tissue
Ground Tissue
Dermal Tissue
Outermost layer of a plantEpidermis: thin layer of cells that
covers the surface of leaf, stem and root
Periderm tissue: bark on stem and large roots of woody plants (replaces the epidermis)
Dermal Tissue
Some dermal tissues have unique functions
Root cells: root hairs (long extensions)
Leaf cells: produce cuticle
Vascular Tissue
Plant circulatory systemVessels that connect roots to leavesTransports water, dissolved
minerals, and sugars throughout plant, providing cells with materials to carry out life functions
Two types: Xylem Phloem
Vascular Tissue: Xylem made up of long hollow tubes
formed by non-living cell walls (left over from plant cells that have died)
transports water and dissolved minerals upwards from roots
Vascular Tissue: Phloem Made up of elongated cells that are
living Transports:
solutions of sugars (food) Dissolved nutrients Hormones
Bi-directional movement of materials downward to roots upward to leaves
Vascular Bundle
Plant Sugars
Starch is NOT soluble in water Starch can be broken down into
sucrose Sucrose IS soluble in water Sucrose is transported through the
phloem to the plant parts that require it Sucrose can be broken down into
glucose Glucose is used in cellular respiration to
make cellular energy
Starch sucrose glucose
Early Spring Trees need energy to
grow leaves Energy comes from
cellular respiration of glucose:Glucose + oxygen carbon dioxide + water + energy
Glucose can be obtained by: Photosynthesis - but
spring trees don’t have any leaves to do photosynthesis
Converting it from starch
Early Spring Starch
Stored in the roots Insoluble in water so it cannot be transported
through phloem Convert to sucrose
Sucrose Soluble in water Transport from root to tree bud through phloem Convert to glucose in tree bud
Glucose Use in cellular respiration Converted to cellular energy needed to grow leaves
Tree Sap
Starch Sucrose GlucoseRoots Stem LeavesStorage Transport Photosynthesi
s
Plant Sugars
SugarSolubilityin water
Location Function
Starch No Root Storage
Sucrose Yes Stem Transport
Glucose Yes Leaf Photosynthesis
Summer
Once leaves have grown, they can perform photosynthesis to produce their own glucose
Glucose is converted to sucrose and transported through the phloem to the roots
Sucrose is converted to starch in the roots for storage
Glucose(leaves)
Sucrose(stem)
Starch(roots)
Winter storage
Summer and Fall
Summer and Fall
Spring
Spring
Sugar Movement through Phloem
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Cells in the Root Cells in the root have no chloroplasts and are not
exposed to sunlight so they can not undergo photosynthesis to make their own food
Root cells must perform cellular respiration to obtain cellular energy
Glucose + oxygen carbon dioxide + water + energy
Glucose comes from the starch stored in the root Oxygen is absorbed through the soil
Plants at Night At night, plants are not exposed to sunlight so
they can not undergo photosynthesis to make their own food
Plants must perform cellular respiration at night to obtain cellular energy
Glucose + oxygen carbon dioxide + water + energy
Glucose comes from the starch stored in chloroplast and vacuoles of most plant cells
Stomata opens at night to allow oxygen to enter the leaves and carbon dioxide to exit
Ground Tissue
Filler tissue in between the dermal and vascular tissue
Variety of processes depending on where it is in the plant
In leaf: palisade and spongy mesophyll cells
3 Tissue Types in Leaf
3 Tissue Types in Stem
http://bio1151b.nicerweb.net/Locked/media/ch35/35_16StemTissueLayers.jpg
3 Tissue Types in Root
http://bio1151b.nicerweb.net/Locked/media/ch35/35_12PrimaryRootGrowth.jpg
3 Tissue Types in Roothttp://bio1151b.nicerweb.net/Locked/media/ch35/growth-root_tissues.html
3 Tissue Types in 3 Plant Parts
http://bio1151b.nicerweb.net/Locked/media/ch35/tissue_system.html
3 Tissue Types in 3 Plant Parts
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