Parts of a Plant and Their Function

Plants Primary source of energy Carbon cycle Sun -> grass -> deer -> humans Carbon cycle Take in carbon dioxide, produce glucose and oxygen Keep us cool, wind breaks, holds soil in place, provide habitat, building materials, fuel

Parts of a Plant Four basic parts Leaves Stems Roots Flowers (fruit/seeds)

Leaves “Food Factory” through photosynthesis Vary in shape, size, and arrangement Help identify plants Simple, compound Toothed, pointed, smooth Lobed, ovate, lanceolate Whorled, alternate, opposite

Parts of a leaf Petiole – leaf stalk Blade – flat part of the leaf Midrib – large center vein Veins – branch of the midrib and form network Margins – edges of the plant leaves

Leaf is made of specialized cells Epidermis Outer, protect the leaf from loss of moisture Guard cells responsible for opening and closing stomata All the plant to breathe Center, food making Chloroplast has chlorophyll Photosynthesis Process by which carbon dioxide and water in the presence of light are converted to sugar and oxygen

Food manufactured in leaf moves down through the stem to the roots Used or stored in stem or root Sometimes cells in roots, stems, and leaves Respiration Oxygen used to produce energy for cells Too much water can affect efficiency