Ch. 30 - Chapter 30 Plant Diversity II The Evolution of...

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Chapter 30 Plant Diversity II: The Evolution of Seed Plants Book Notes Overview 30.1 – The reduced gametophytes of seed plants are protected in ovules and pollen grains 30.2 – Gymnosperms bear “naked” seeds, typically on cones 30.3 – The reproductive adaptations of angiosperms include flowers and fruits 30.4 – Human welfare depends greatly on seed plants Summary Table Key Terms Overview
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Seed Plants o Seeds changed the course of plant evolution enabling their bearers to become the dominant producers in most terrestrial ecosystems Section 30.1 Seed Plants o In addition to seeds, the following are common to all seed plants Reduced gametophytes developed within the spores retained within tissues of the parent saprophyte Heterospory Ovules Pollen Heterospory: The Rule Among Seed Plants o Seed plants evolved from plants that had megasporangia which produce megaspores that give rise to female gametophytes o Seed plants evolved from plants that had microspoangia which produce microspores that give rise to male gametophytes Ovules and Production of Eggs o An ovule consists of a megasporangium, megaspore, and protective integuments Pollen and Production of Sperm o Micropores develop into pollen grains which contain the male gametophytes of plants o Pollination is the transfer of pollen to the part of a seed plant containing the ovules
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Ch. 30 - Chapter 30 Plant Diversity II The Evolution of...

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