BIOL 1011 Lecture Notes - Lecture 2: Eudicots, Cotyledon, Vascular Tissue

• School: Dalhousie University
• Department: Biology
• Course: BIOL 1011
• Professor: Multiple

Document Summary

Flowering plants & the structure and growth of land plants. Anthophyta division flowering plants: ~250,000 species, reproductive organs in flowers, sporophyte dominant, heterosporous, microgametophyte = pollen, megagametophyte: 8 nuclei, triploid (3n) endosperm. A flower is a shoot with highly modified leaves. Flower structure: 4 whorls of modified leaves. There are two major groups of anthophytes, monocots and eudicots. Monocot: one cotyledon, veins are usually parallel, vascular tissues are scattered, root system is fibrous, pollen grain has one opening, floral organs in multiples of 3, ex. Eudicot: two cotyledons, veins are usually net-like, vascular tissue arranged in a ring, taproot usually present, pollen grain has three openings, floral organs are in multiples of four or five, ex. Almost all flowering plants have male and female organs within the same flower. 85% of angiosperm species are cosexual or hermaphrodite flowers. Pollination arrival of pollen on stigma (on flowering plants) or on receptive female cone (conifers).