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Objective – To continue our learning about the leaf

Objective – To continue our learning about the leaf. Warm Up Put your leaf lab in the center of the table What are smart things to do while taking an exam Reminder – today is the regents practice test. Epidermis. Out layer of cells covering the leaf Boundary with the outside world

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Objective – To continue our learning about the leaf

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  1. Objective – To continue our learning about the leaf • Warm Up • Put your leaf lab in the center of the table • What are smart things to do while taking an exam Reminder – today is the regents practice test

  2. Epidermis • Out layer of cells covering the leaf • Boundary with the outside world • Often transparent (no chloroplasts – allows light through to photosynthesizing cells) • Often covered with a waxy coat (sometimes reduced on the underside) • Functions: • Protection against water loss • Regulation of gas exchange (has openings call stoma or stomata – plural = stomates) • Secretion of metabolic compounds • In some species it may help in water absorption

  3. Stoma – (Opening and Guard Cells) • Openings in the leaf surface • Zone of gas exchange (Carbon Dioxide, Oxygen and Water) • Bordered by Guard Cells • Specialized cell that respond to the environment to control gas exchange • Especially sensitive to water conditions and regulating water loss. (They close to prevent the greatest amount of water loss. Especially important in succulents that grow in arid environments.)

  4. Mesophyll • Palisade Layer • Generally cells are very close • Most concentrated chloroplasts • Site of Photosynthesis • Spongy Layer • More space exists between cells (for air) • Cells contain chloroplasts • Site of Photosynthesis • Veins run through this layer of cells

  5. Comparison Plant Animal (Human) Protection Regulated exchange with the environment Responds to the environment (goose bumps, etc.) No food production • Protection • Regulated exchange with the environment • Responds to the environment (guard cells especially) • Region of primary food production

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