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

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Presentation transcript:

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 oxygen + glucose → carbon dioxide + water (+ energy)  Photosynthesis  0400 – 2000  1200 – 1600 was when most CO 2 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

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

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

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

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

Spongy Mesophyll  This layer is full of air spaces which allows CO 2 to reach chloroplasts in the palisade layer

Stomata  Stomata are tiny holes which allow CO 2 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 closes the pore preventing water loss but it also stops CO 2 getting in so photosynthesis stops too!

Xylem & Phloem  Xylem transports water  Phloem transports food