Brooks Biodiversity Unit 3 Latest Update Graded A+

Coevolution adaptations go hand in hand, with one species evolving with the other Plant/Animal Hierarchy Cells --> Tissues --> Organs 3 Plant Tissues 1. Dermal ("Skin") 2. Vascular ("Veins") 3. Ground Tissue ("support tissue") Leaves Responsible for collection and conservation of solar energy Main photosynthetic organ of most vascular plant Stems Positioning and support of leaves Trunks of trees are actually modified stems Roots Anchorage and absorptionVery important for gas exchange Roots must anchor quickly and take up water Are all stomata on the lower surface of the leaf? No! Only most On exam Vascular Tissue Xylem and Phloem Responsible for transport Leaf Structure 1. Epidermis 2. Mesophyll 3. Vein (Vascular Bundle/Vascular Tissue) Epidermis of Leaf (2 Parts) Dermal Tissue Composed of: 1. Cuticle 2. Guard Cells with StomataCuticle Non-living structure made of wax Produced by the Epidermis to resist desiccation (drying out) Stomata Contain tiny pores called stoma and guard cells Most are located on the surface of the plant, but there are some on the upper surface Purpose is to regulate gas exchange Guard Cells Control the opening and closing of stomata Purpose is to regulate gas exchange Mesophyll Middle part of the leaf that is the photosynthetic layer (dermal tissue) Composed of parenchyma Parenchyma Cells that make up the mesophyll and cells in plants Generalized cell type in plants, which can be modified into collenchyma and sclerenchyma Thin and flexible cells Most common and versatile ground tissue Used for metabolic functions and storage of organ