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Structure of plants • Vascular plants- have roots, stems and leaves ( ) • Leaves are adapted for photosynthesisbroad leaves have Broad leafed Thin leafed Structure of a leaf • Epidermis• Cuticle- top of epidermis, • Stomata- openings found – Allow for gas exchange C02 in (photosynthesisO2 out (photosynthesisH2O vapor out (transpiration- ) • Guard cells- regulate opening & closing of stomate• Palisade Layer- below epidermis• Spongy Layer- below palisade, gas exchange, • http://www.youtube.com/watch?v=IlmgFY mbAUg Vascular Tissue • Veins• Xylem- carries • Phloem- carries – • Roots- absorb water and nutrients Root hairs- Vascular Tissue Monocot Stem This is a cross section through part of a plant: Is it root or stem? Is it monocot or dicot? How do you tell? scattered vascular bundles throughout Name structure A. vascular bundle Name tissue B. ground tissue Example Corn Dicot Stem This is a cross section through part of a plant: Is it root or stem? Is it monocot or dicot? How do you tell? ring of vascular bundles Name tissue A. epidermis Name structure B. vascular bundle C and D are both ground tissue. Specifically, C is pith and D is cortex. Example Sunflower Chemical Regulation • Auxin- Plant hormone, causes • Phototropism- plant bends toward light, auxin – • Geotropism- roots grow down, • Apical Meristem- region of growth (lengthwise)-