BISC 101 Lecture Notes - Lecture 9: Pollen, Vascular Plant, Eudicots
29 Oct 2017
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Bisc 101: midterm 2 review - plant form and function: describe the difference b/w monocots & eudicots. Absorb h2o & nutrients from the soil with root hairs. Carries h2o/minerals from roots leaves(xylem) & photosynthesis (sugars) in both directions b/w roots & shoots (phloem: describe some diverse root systems. Structural support holds up tree sin shallow/unstable soils. Repeating series nodes, internodes, leaves & apical/axillary buds. Shoot with very short internodes & thick leaves. Arranged in vascular bundles eudicot = ring . Secondary cell walls strengthened w lignin avoid collapse with h2o transport. 1. cell division: mitotic cells revealed by staining for cyclin. 2. vessels shorter/wider/thinner walled tubes stacked end-end with perforations b/w adjacent cells = h2o passes. 1. sieve tube elements: describe the sugar conducting cells of the phloem. Have sieve plates (pores) b/w adjacent cells. Alive @ functional maturity w/o nucleus, ribosomes, vacuoles, cytoskeleton. Enable sap to pass easier tube connecting cells. Connected by sieve tubes by many plasmodesmata.
