Brooks Biodiversity Unit 3 Exam 2024 with complete solution

Brooks Biodiversity Unit 3 Exam 2024 with complete solution Plants Architecture Plant needs i. collection & conversion of solar energy - leaves ii. positioning & support of leaves - stems iii. anchorage & absorption - roots iv. transport - vascular system Leaf Structure Epidermis, Mesophyll, and Vein (Vascular Bundle) Epidermis contains what? - Cuticle - Guard cells with Stomata Epidermis outermost cell layer of a plant body cutin: (wax) excreted by epidermis Cuticle Waxy waterproof covering of a plant. Produced by the epidermis and has wax to resist desiccation. Guard Cells Responsible for opening and closing stomata. Works together with stomata to regulate gas exchange. Prevents movement of water ACROSS surface Stomata Small openings on the underside of a leaf through which oxygen and carbon dioxide can move. Mostly on lower surfaces, sometimes on upper surfaces. Found on both surfaces. Allows for gas exchange. 2 aspects of Photosynthesis light dependent reactions light independent reactions Mesophyll contains what? - Parenchyma - Dicots have Palisade & Spongy Layers Mesophyll Middle leaf structures photosynthetic layer. Parenchyma Ground tissue that forms the bulk of the mesophyll Can be modified into collenchyma and sclerenchyma Thin and flexible cells Most common and versatile ground tissue Used for metabolic functions and storage of organic products Palisade & Spongy layers Palisade layer: where light dependent reactions occur, near the surface. Top part of the mesophyll in dicot plants. Spongy mesophyll or spongy parenchyma: soft lower layer. Has access to CO2