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Plant Diversity What are Plants? • Multicellular (made of many cells) • Eukaryotes (cells have nucleus & organelles) • Cell Walls made of Cellulose • Autotrophs – Photosynthetic using chlorophyll a & b Survival • Plants need 4 things: 1) Sunlight: without light they cannot get energy 2) Water & Mineral: needed for photosynthesis 3) Gas Exchange: take in CO2 & let out O2 4) Movement of Water & Nutrients: food made by plant needs to get to all parts of the plant First Plants • What organism have we covered that looks like a plant? – Multicellular GREEN ALGAE – Thought to have started in the ocean Mosses & Bryophytes • Non-vascular Plants – Don’t have tissues transporting water through them • Dependent on Water – Take in water through osmosis • Bryophytes Include: – Mosses, Liverworts, & Hornworts 1) Mosses 2) Liverworts 3) Hornworts Seedless Vascular Plants • Include: – Club Mosses – Horsetails – Ferns • Most numerous • Have true roots, leaves, & stems Vascular Tissue • Vascular Tissue: – transfers water & nutrients through the plant • Traicheids: cells specialized to move water • Xylem: cells that move water up the plant • Phloem: cells that move nutrients and carbohydrates made by photosynthesis True Integral Parts • These are the 1st plants to show: – True Roots: underground organs that absorb water and minerals – True Leaves: photosynthetic organs that contain vascular tissues – True Stems: supporting structures that connect roots and leaves; carry water Seed Plants • Can reproduce without water! Why? – They have flowers or cones – Transfer sperm by pollination – Embryo is protected in seed Types of Seed Plants • Two Types: – Gymnosperms • have seeds directly on surface of cones – Angiosperms (Flowering Plants) • have seeds that are protected by a layer of tissue (i.e. Fruit: has tissue around seed) Angiosperms • 2 Types: Dicots & Monocots Life Span • Three Categories: – Annual: flowering plants that complete life cycle in one growing season – Biennial: complete their life cycle in two years – Perrenial: flowering plants that live more than 2 years