Biology 2217B Lecture Notes - Lecture 4: Woody Plant, Herbaceous Plant, Papaya

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Today"s lecture brought to you by tobacco and papaya. Two systems of plant body: root system (below ground part, normally underground, dark, moist, woody. Shoot system: aerial portion part (part that is above the surface) Illuminated, relatively dry: herbaceous (does not develop woody parts) Plant body: plants grow where there s meristematic tissue, which is tissue that is actively dividing, meristems produce three types of tissues: dermal, ground, and vascular tissues, these are the places of active growth in a plant. Leaf cross-section: brownish area (top) - epidermis, depending on the leaf, the arrangement will be different and the thickness will be different. Dermal tissues: root hairs have different functions depending on the kind of leaf, guard cells. Inside you can find 3 cell types: parenchyma, collenchyma, sclerenchyma: what makes up the bulk of the body of the plant, bulk of herbaceous plants, distinguished by cell wall structure, growing cell secretes a primary cell wall.

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