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Transpiration

Transpiration. Transpiration Objectives 7-9. How is water transported to the uppermost leaves of a tree that is over 100 feet tall? Root Pressure

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Transpiration

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  1. Transpiration

  2. TranspirationObjectives 7-9 How is water transported to the uppermost leaves of a tree that is over 100 feet tall? Root Pressure • Plants use active transport (movement of materials that requires ________) to bring minerals such as nitrogen, phosphorous and potassium into the roots. Energy

  3. TranspirationObjectives 7-9 Decreases • As the concentration of minerals increases, the relative concentration of water _____________. • Water moves into a plant’s roots through _____________ since there is a higher concentration of water in the soil than in the root. • The water moves to the center of the root to the _______________where it is trapped in long tube like cells. • As more and more water moves into the root it is pushed upward through the ___________. This is called root pressure. osmosis Vascular Tissue Xylem

  4. TranspirationObjectives 7-9 Capillary Action • Cohesion—the attraction of __________ molecules to each other due to hydrogen bonding. Water

  5. TranspirationObjectives 7-9 water • Adhesion—the attraction of __________ molecules to other substances (such as the walls of a glass tube or xylem cells). • The combination of these 2 forces will cause water to move up thin tubes and is called capillary action.

  6. TranspirationObjectives 7-9 ***How does capillary action help water to move through the stem of a plant? Water is attracted to xylem and to each other. As water moves up it pulls other water molecules with it.

  7. TranspirationObjectives 7-9 In larger plants root pressure and capillary action are not sufficient to transport water to the uppermost branches and leaves.

  8. TranspirationObjectives 7-9 Transpiration • Transpiration—the loss of ___________ from leaves through _____________. • As water is lost from the plant, _____________ causes water to move upward through the plant to replace the lost water. Water Evaporation Osmosis

  9. TranspirationObjectives 7-9 Osmosis Xylem • The force of _____________ ‘pulls’ water upward through the vascular system (__________). • When a plant is not able to replace lost water quickly enough it begins to _______. Cells in the leaves lose pressure and the guard cells shrink, closing the ______________ to prevent water loss. Wilt Stomata

  10. TranspirationObjectives 7-9 ***How does this help the plant maintain homeostasis? Wilting closes the stomata and slows down water loss. This keeps the plant from losing too much water.

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