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The Leaf of a Flowering Plant

The Leaf of a Flowering Plant. Factory of Photosynthesis. Leaf Functions. Carries on Photosynthesis Stores food Limited capability of reproduction Regulates transpiration. External Leaf Anatomy. Blade: The flattened part of the leaf. Margin: The edge of the blade.

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The Leaf of a Flowering Plant

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  1. The Leaf of a Flowering Plant Factory of Photosynthesis

  2. Leaf Functions • Carries on Photosynthesis • Stores food • Limited capability of reproduction • Regulates transpiration.

  3. External Leaf Anatomy • Blade: The flattened part of the leaf. • Margin: The edge of the blade. • Petiole: Connects the blade with the stem. • Vein: xylem, phloem, and connective tissue.

  4. Leaf Type • Simple Leaf: The blade is one complete structure. • Compound Leaf: The blade is divided into smaller units called leaflets.

  5. Leaf Venation • Netted: One main vein with many branching ones off to the sides. (Dicots) • Parallel: Many main veins running along the length of the blade. (Monocots)

  6. Margin

  7. Internal Leaf Anatomy • Epidermis • Cuticle • Palisade Mesophyll (chloroplasts) • Spongy Mesophyll • Vein (xylem and phloem) • Air Spaces • Lower Epidermis • Stomata • Guard cells Upper Epidermis Palaside Mesophyll Xylem Phloem Air Space Stoma Guard Cells

  8. Stomata • Guard cells regulate the size of the stoma. • K+ (potassium ions) enter the cells causing them to fill with water. • This opens the stoma when they become turgid. • A loss of K+ causes the opposite to occur, and they close when they become flaccid. Stomata Control Open The Cells are Turgid Closed The Cells are Flaccid

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