BIOL-1507EL Lecture Notes - Lecture 1: Gynoecium, Gnetophyta, Eudicots
14 Apr 2017
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Essay points: seed plants, pollination by insects and animals. Welwitschia: it is well adapted to desert or arid conditions (it has giant strap-like leaves) Gnetum: grows in the tropics as tree vines. Ephefra: it is a shrub of american desert. The flowering plants are the most diverse and geographically widespread of all plants. There are about 300. 000 species so far identified compared with gymnosperm has about 550 species. Examples of monocots: lilies, orchids, palms, and grasses including lawn grasses, sugarcanes and grain crops (corn, wheat rice and other) Examples of dicots: roses, peas, buttercups, sunflowers, oak and maples. Most angiosperms employ insects and other animals plus wind to transfer the pollen from male to female gametophytes. Xylem tissue in angiosperm or flowering consists of tracheadis and vessel elements compared to gymnosperm, their xylem manly consists of tracheadis the flower is the reproductive structure of angiosperms. Know life cycle of the flowering plant (pg. 526 - fig 26. 31)
