Continue of Plant kingdom

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Presentation transcript:

Continue of Plant kingdom Roots, Stems and Leaves Continue of Plant kingdom

I. Specialized Tissues A. Seed plants have organized tissues 1. Roots A. Anchor plants B. Absorbs water C. Prevent Erosion 2. Stems A. Supports B. Transports C. Protects 3. Leaves A. Photosynthesis B. Adjustable pores to prevent water loss

II. Roots A. Two types of roots 1. Taproots 2. Fibrous roots A. Mainly found in dicots Single, large root 2. Fibrous roots A. Mainly found in monocots

III. Stems A. Three important functions 1. Produce leaves, branches and flowers 2. Hold leaves up to sunlight 3. Transports substances between roots and stems

B. Distinct Regions 1. Nodes: where leaves are attached 2. Internodes: Regions between nodes 3. Buds: Attached to nodes A. Make new leaves and stems

C. Monocots and Dicots stems A. Vascular bundles are scattered Flower petals come in multiples of 3 Parallel veins in leaves 2. Dicots B. Vascular bundles are arranged in a cylinder Flower petals come in multiples of 4 or 5 Netted veins in leaves Monocot Dicot

IV. Leaves A. Structure designed to optimize light and do photosynthesis 1. Blades: thin flat section 2. Petioles: attaches blade by a thick stock 3. Covered by a thick cuticle A. protects and limits water loss

B. Photosynthesis 1. Mostly occurs in the tissues called the Mesophyll A. Palisade mesophyll: absorbs the light B. Spongy mesophyll: loose tissue filled with air spaces Air spaces connect to the outside by the Stomata

C. Transpiration 1. Loss of water through leaves 2. Helps pull water up through stomata Stomata also stays open for gas exchange, but not too long because of water loss

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