Presentation on theme: "Review What are the three main tissue systems of plants"— Presentation transcript:
1 Review What are the three main tissue systems of plants Compare and Contrast How do the three main functions of a plant’s tissue differForm and Function How might the presence of meristems explain the ability of plants to regenerate from cuttingsInfer With your prior knowledge of the circulatory system, write a paragraph comparing and contrasting the structure and function of the vascular system of a plant to the human circulatory system
2 Ch 23 Plant Structure and Function 23.1 Specialized Tissues in Plants
3 Seed Plant StructureThree principal organs of seed plants are roots, stems, and leaves.
4 Roots Anchor plant in ground Help prevent erosionAbsorb water and nutrients and transport to rest of plantStore foodHold plant upright.
5 Stems Support system for the plant body Transport system that carries nutrientsDefensive system to protect against predators and diseaseProduces leaves and flowers.
6 Leaves Main photosynthetic organs Regulates water by controlling air exchange.
7 Plant Tissue Systems Three main tissue systems: Dermal Vascular Ground.
8 Dermal Tissue Protective outer covering of a plant Epidermis Single layer of cells that makes up the dermal tissueMay have tiny hair like projections on leaves and roots.
9 Vascular Tissue Supports the plant body Transports water and nutrients XylemPhloemConsist of long, slender cells that connect almost like sections of pipe.
10 Xylem Tracheids Xylem cells Leave cell walls made of lignin when they dieOpenings allow water movement from cell to cell.
11 Xylem Vessel elements Wider than tracheids and are arranged end After cell dies, cell walls allow water to move freely.
12 Phloem Alive at maturity Transports sugar throughout plant Sieve tube elementsArranged end to end with ends having many small holesLose nuclei and organelles as they matureKept alive by companion cells.