BI111 Lecture Notes - Eudicots, Vascular Cambium, Sieve Tube Element
Document Summary
Plant bodies are dendritic (spreading and branched in form) Highly adaptive for photosynthesis and positions flowers for pollination. Buds give rise to extension of shoot or new, branching shoot. Produces flowers which later develop fruits containing seeds. 3 tissue systems: groumd, 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) Large vacuole (30-80% of internal volume) aka tonoplast. Used for storage and to maintain turgor pressure against the cell wall. Hemicellulose is a branching polymer consists of chains of 500-3,00 sugar units. Cellulose is a branched polymer made of 7,000 - 15,000 glucose molecules per polymer (most abundant organic substance on earth!) Pectins particularly abundant in the non-woody parts of terrestrial plants.
