BI111 Lecture Notes - Lecture 7: Sieve Tube Element, Vascular Cambium, The Plant Cell
Document Summary
Almost all plants are photosynthetic autotrophs(use photosynthesis to feed themselves-fixing carbon based on capture of solar energy) Shoot system above ground: photosynthetic leaves, stems. Root system below ground: nonphotosynthetic roots. Plant bodies are dendritic(spreading and branched in form) Highly adaptive for photosynthesis and positions flowers for pollination. Vegetative(nonreproductive: stem with attached leaves and buds, bud gives rise to extension of shoot or new, branching shoot. Reproductive shoot: produces flowers which later develop fruits containing seeds. Absorbs water and dissolved minerals from soil. 3 tissue systems: ground, vascular and dermal. Organ/tissue system: body structure that contains two (or more!) types of tissues and have a definite form and function. Tissue: group of one (or more!) types of cells and intercellular substances that function together in one (or more!) specialized tasks. Primary cell wall (surrounding plasma membrane and cell contents: cellulose fibres in matrix of hemicellulose, rigid but flexible.
