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PLANT CIRCULATION

PLANT CIRCULATION. Leaves - photosynthetic organs. Figure can be found in Campbell pg. 749. Stem - contain vascular tissue. Roots - gas exchange, H 2 O absorption, mineral uptake. cuticle. epidermis. pallisade mesophyll. XYLEM. spongy mesophyll. H 2 O. CO 2. Stoma.

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PLANT CIRCULATION

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  1. PLANT CIRCULATION Leaves - photosynthetic organs Figure can be found in Campbell pg. 749 Stem - contain vascular tissue Roots - gas exchange, H2O absorption, mineral uptake

  2. cuticle epidermis pallisade mesophyll XYLEM spongy mesophyll H2O CO2 Stoma LEAF CROSS SECTION

  3. Phloem Xylem STEM CROSS SECTION Carbohydrates Shoot Root H2O

  4. Carbohydrates Phloem Xylem H2O & Minerals ROOT CROSS SECTION

  5. Air Movement Atmospheric Pressure HOW DOES WATER MOVE? Adhesive Properties of Water Capillary Action

  6. TRANSPIRATION Driving Forces I. Root Pressure II. Evaporation

  7. TRANSPIRATION The osmotic absorption of water in the plant roots, and pressure from water loss through the leaves that draws water up through the plants xylem vessels. CONFLICT: CO2 Intake versus Transpiration Stomata must be open for CO2 intake, but such opening also allows for water loss.

  8. ROOT ABSORPTION Endodermis w/Casparian Strips H2O -enters by osmosis. Minerals -actively transported into roots. Casparian Strips - endodermal cells regulate passage of minerals into the vascular tissue, while water moves through or between cells. The strip is a belt of waxy material that prevents simple diffusion, and forces minerals and water to enter the vascular tissue through active transport by way of the endodermal cells

  9. ENDODERMIS & CASPARIAN STRIPS EPIDERMIS ENDODERMIS CASPARIAN STRIP XYLEM

  10. ROOT ABSORPTION Mycorrhizae The symbiotic interaction of root hairs and fungal hyphae provide increased surface area for water and mineral absorption and allow for more efficient transport of these into the plant. Guttation When root pressure is very high, it can force water up through The leaves of small plants, where the water exits through Structures as the ends of the leaf veins (hydathodes).

  11. increase in guard cell K+ concentration causes increased • turgor pressure, causing guard cell to bulge and stoma to open. A • maintenance of open stoma is dependent upon ATP, in order to actively • pump in K+. When this ceases, turgor pressure decreases and stoma close. B TRANSPIRATION Regulation by Stoma A B epidermal cell guard cell arrow direction represents movement of water

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