BIO_SC 1200 Lecture Notes - Lecture 1: Vascular Tissue, Ground Tissue, Pith
15 Jan 2015
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Document Summary
Vascular tissue: move water, sugar, nutrients, and chemical signals through the plant. Ground tissue: bulk of the plant, giving it strength and storage. Some leaves have specialized shape: less wind resistance, etc, evergreens have needle shaped leaves. Upper epidermis top of the leaf: one layer thick, covered in waxy cuticle. Mesophyll cells: one kind in monocots, two in dicots. Palisade cells upright, column like structure: primary site of photosynthesis, contain 80% of chloroplasts. Spongy mesophyll: have air spaces between cells, vascular bundles are embedded in mesophyll. Lower epidermis: single layer on bottom of cells, also has waxy cuticle, studded with guard cells. Stomata are pores that allow for air exchange. Apical meristem (root and shoot) are the only places where mitosis occurs. Move because of gravotropism: detect gravity store starch structure, make up one third of the mass, outermost layer is the epidermis protect the root. Mangrove tree: parasitic roots embed in host plant, feeding off of its resources.
