Chapter 30

Chapter 30 - Chapter 30: Plant Diversity II-The Evolution...

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Chapter 30: Plant Diversity II—The Evolution of Seed Plants 2/26/10 Concept 30.1: The reduced gametophytes of seed plants are protected in ovules and pollen grains Characteristics common to all seed plants 1. Seeds 2. Reduced gametophytes 3. Heterospory 4. Ovules 5. Pollen Gametophyte/sporophyte relationships 1. Gametophytes of seed plants develop within the walls of spores retained within tissues of the parent sporophyte 2. No longer dependent on water for fertilization Figure 30.2 Ovules and production of eggs 1. An ovule consists of a megasporangium, megaspore, and protective integuments Figure 30.3
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Pollen and production of sperm 1. Microspores develop into pollen grains a. Contain male gametophyte 2. Pollen can be dispersed by air or animals, eliminates the need for water in fertilization Microsporangia Pine pollen angiosperm pollen grains If a pollen grain germinates… 1. It gives rise to a pollen tube that discharges sperm into the female gametophyte within the ovule 2. See second part to figure 30.3
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Chapter 30 - Chapter 30: Plant Diversity II-The Evolution...

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