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chapter26notes

chapter26notes - ChL 26 Plant tissue Our Focus is on...

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ChL 26    Plant tissue:  Our Focus is on angiosperms. Life Cycle - germination --> seed formation -> death Annuals - life cycle is 1 single season. These are usually non-woody  (herbaceous) plants. Biennials - live for two connective seasons; roots, stems & leaves form the Ist season Flowers & seeds m fee 2s* season; then plants die, Ex: carrots Perennials - live year to year; bulbs can reform and re-grow. Shoots &  Roots (Fig.26.2) Shoots are the above-ground parts, such as leaves, stems, and flowers,  Flowers are the reproductive organs & Leaves conduct photosynthesis. Roots grow downward & outward in soil. Roots absorb water & minerals. Roots anchor the plant. Root stores food (glucose) and supplies the shoots, 3 tissue systems ground Vascular (2 kinds) Dermal (covers and protects) Meristems Meristems are where growth starts. Apical Meristems  - the tip of the shoot; plant begins to lengthen and  root starts; primary growth.  Lateral Meristems  - Vascular cambium makes the secondary vascular tissue. Thick stem grows outward.  (3)1 o meristems protoderm = epidermis Ground = ground tissue Procambium = 1 vascular tissue Sturdier covering (periderm) that replaces the epidermis. As a whole, the thick stems and roots = 2 o growth.
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