STOMATA ON LEAVES.

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Presentation transcript:

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 These can open by becoming turgid and close by becoming flaccid Guard cells contain chloroplasts Usually open during the day and closed at night

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

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

Vascular Bundle Xylem Phloem

A vascular bundle in a stem

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?

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DIDYMO ORGANISMS

Didymo algae cell

Unicellular organisms They will be moving!

Paramecium