BIO 1406 Lecture Notes - Lecture 16: Pollination, Illicium Verum, Germination
Document Summary
Seeds changed the course of plant evolution, enabling their bearers to become the dominant producers in most terrestrial ecosystems. Seed plants originated about 360 million years ago. A __seed__ consists of an embryo and nutrients surrounded by a protective coat. Seeds can disperse over long distances by wind or other means. Concept 30. 1: seeds and pollen grains are key adaptations for life on land. In addition to seeds, the following are common to all seed plants. The gametophytes of __seed plants__ develop within the walls of spores that are retained within tissues of the parent sporophyte. The ancestors of seed plants were likely homosporous, while seed plants are heterosporous. __magasporangia_ produce megaspores that give rise to female gametophytes. Microsporangia produce microspores that give rise to male gametophytes. An ovule consists of a megasporangium, _magaspore_, and one or more protective. Microspores develop into ____pollen grains______, which contain the male gametophytes.
