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STOMATA ON LEAVES

STOMATA ON LEAVES. CELL WALL. GUARD CELL. STOMA (PORE). EPIDERMAL CELLS. STOMATA – STRUCTURE . Found on the lower (and sometimes upper) epidermis (surface) of leaves Holes/pores in leaf Singular – stoma, plural – stomata Hole is surrounded by two guard cells

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STOMATA ON LEAVES

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  1. STOMATA ON LEAVES

  2. CELL WALL GUARD CELL STOMA (PORE) EPIDERMAL CELLS

  3. STOMATA – STRUCTURE • Found on the lower (and sometimes upper) epidermis (surface) of leaves • Holes/pores in leaf • Singular – stoma, plural – stomata • Hole is surrounded by two guard cells • These can open by becoming turgid and close by becoming flaccid • Guard cells contain chloroplasts • Usually open during the day and closed at night

  4. STOMATA – ROLES, FUNCTIONS • To control the entry and exit of gases into and out of the leaf • Guard cells open and close to control this • Stomata respond to outside conditions • When conditions are right for photosynthesis, stomata open wide for gas exchange • When it is too dry or dark, stomata close up. • Closed stomata prevent water loss in plant

  5. TRANSPORT OF WATER AND FOOD • Vascular bundles/tissues • Contain xylem for transporting water UP from roots to leaves • Contain phloem for carrying food/nutrients like sugars and amino acids down from leaves to plant

  6. Vascular Bundle Xylem Phloem

  7. A vascular bundle in a stem

  8. Your turn to find some! • Use the celery stems to cut a VERY fine slice • View under microscope • Find a vascular bundle on low then med power • Xylem will be redish? Maybe?

  9. WHAT YOU SHOULD TRY TO SEE XYLEM PHLOEM

  10. DIDYMO ORGANISMS

  11. Didymo algae cell

  12. Unicellular organisms • They will be moving!

  13. Paramecium

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