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Leaf Adaptation

Leaf Adaptation. D. Crowley, 2008. Leaf Adaptation. To know how leaves are adapted for photosynthesis. Respiration & Photosynthesis. Complete the respiration and photosynthesis worksheet. Respiration & Photosynthesis. carbon dioxide + water (+ light energy) → oxygen + glucose

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Leaf Adaptation

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  1. Leaf Adaptation D. Crowley, 2008

  2. Leaf Adaptation To know how leaves are adapted for photosynthesis

  3. Respiration & Photosynthesis • Complete the respiration and photosynthesis worksheet

  4. Respiration & Photosynthesis carbon dioxide + water (+ light energy) →oxygen + glucose oxygen + glucose→carbon dioxide + water (+ energy) • Photosynthesis • 0400 – 2000 • 1200 – 1600 was when most CO2 was used • Photosynthesis happens fastest when the light is brightest • Fewer bubbles • Less light = slower photosynthesis • More bubbles • More of the raw materials for photosynthesis

  5. The Leaf • Leaves are designed for one thing – making food via photosynthesis • Leaves are broad and flat to capture lots of light • Veins carry water to the leaf, and food away to the rest of the plant (veins also support the leaf) • Small holes called stomata in the underside of the leaf allow gases in and out

  6. Leaf Components There are specialised parts to a leaf which help with photosynthesis

  7. Epidermal Cells & Waxy Cuticle • Cells in the epidermis make wax which covers the leaf surface (especially at the top) which limits water loss and acts as a protective barrier

  8. Palisade Cells • These cells are full of chloroplasts (containing chlorophyll) which it where photosynthesis takes place

  9. Spongy Mesophyll • This layer is full of air spaces which allows CO2 to reach chloroplasts in the palisade layer

  10. Stomata • Stomata are tiny holes which allow CO2 into the leaf (they also allow water to escape) • The stomata are pores which open and close automatically controlled by guard cells • When there is lots of water they become turgid so the pore opens • When there is not much water they become flacid which closesthe pore preventing water loss but it also stops CO2 getting in so photosynthesis stops too!

  11. Xylem & Phloem • Xylem transports water • Phloem transports food

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