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Unit 3 Parts of the Plant and Their Functions

Unit 3 Parts of the Plant and Their Functions. Plant life is essential for life on earth. -Plants provide food, oxygen, and enjoyment Plants are made up of four basic parts 1. Leaves 2. Stems 3. Roots 4. Flowers. Leaves. Leaves are the food factory of the plant.

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Unit 3 Parts of the Plant and Their Functions

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  1. Unit 3Parts of the Plant and Their Functions • Plant life is essential for life on earth. -Plants provide food, oxygen, and enjoyment Plants are made up of four basic parts 1. Leaves 2. Stems 3. Roots 4. Flowers

  2. Leaves • Leaves are the food factory of the plant. • External Leaf Structure • Petiole - leaf stalk • Blade - usually the flat part • Veins – structural frame • Margin-edge of leaf

  3. Parts of a leaf

  4. Leaves help in the identification of horticulture plants.

  5. Internal Leaf Structure • Epidermis-skin of the leaf • Chloroplasts-process food • Photosynthesis - is the process by which carbon dioxide and water in the presence of light are converted to sugar and oxygen. Carbondioxide+water+sunlight=sugar+oxygen 6CO2 + H2O + Sunlight = C6H12O6 + 6O2 • Guard Cells • Open and Close stoma to allow the leaf to exchange gases

  6. Stems • 2 Main Functions • Movement of materials • Support the leaves and reproductive structures • Also used for food storage, reproduction methods • External Stem Structure • Terminal Bud • Axillary Bud • Bud Scale Scar • Lenticle

  7. Internal Stem Structure • Phloem – manufactured food travels down • Xylem – water and minerals travel up • Cambium – produces the new stems Cross Section of a Stem

  8. Roots Functions • Anchor the plant and hold it Upright • Absorb water and minerals from the soil and conduct them to the stem • Store large quantities of plant food • Propagate or reproduce some plants

  9. Flowers • Complete Flower – • Both Male and Female Parts • Incomplete Flower – has only the male or female parts. • 4 Main Parts • Sepals – protect the flower bud • Petals – leaves (attract insects) • Stamens – Male reproductive parts • Pistil – Female Parts

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