Exam 3 Notes

Exam 3 Notes - Chapter 30 Chapter 30 Plant Diversity IIThe...

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Chapter 30 Chapter 30: Plant Diversity II—The Evolution of Seed Plants 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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Chapter 30 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 30.3b A seed 1. Develops from the whole ovule 2. Includes sporophyte embryo, food supply, protective coat Pine seed 3. See third part to figure 30.3c Clicker Question: Which does not apply to gymnosperms or angiosperms? Single spore type Clicker Question: In seed bearing plants, microspores develop into pollen grains Concept 30.2: Gymnosperms bear “naked” seeds, typically on cones Gymnosperms include… 1. Phylum Cycadophyta a. Sago palms 2. Phylum gingkophyta 3. Phylum gnetophyta Gymnosperms include… (cont’d)
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Chapter 30 4. Phylum coniferophyta a. Pines b. Firs c. Junipers d. Sequoias Figure 30.5 A closer look at the life cycle of a gymnosperm 1. Key features of the gymnosperm life cycle include a. Dominance of the sporophyte generation b. The role of pollen in transferring sperm to ovules b.i. No water required c. The development of seeds from fertilized ovules Pine Life Cycle Figure 30.6 Clicker Question: How many generations are represented in the seed of a gymnosperm? 3
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Chapter 30 Clicker Question: Gymnosperms include _________. Cycads, conifers, Ginkgo biloba , and gnetophytes Concept 30.3: The reproductive adaptations of angiosperms include flowers and fruits 1. Angiosperms, a.k.a., flowering plants a. “covering seeds” 2. Derived traits are the reproductive structures called flowers and fruits 3. The most widespread and diverse of all plants a. 250,000 species b. 90% of all extant plant species Angiosperm Diversity Figure 30.12 Figure 30.13 Flowers 1. Specialized for sexual reproduction 2. Specialized shoot with modified leaves a. Sepals: enclose the flower b. Petals: brightly colored, attract pollinators c. Stamens: produce pollen d. Carpels: produce ovules Figure 30.7 Fruits 1. A mature ovary a. Ovary matures after fertilization of ovules 2. Can be carried by wind, water, or animals, enhancing dispersal
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Chapter 30 Figure 30.8 Figure 30.9 The angiosperm life cycle 1. Double fertilization occurs when a pollen tube discharges 2 sperm into the female gametophyte within an ovule a. 1 st sperm fertilized the egg b. 2 nd
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Exam 3 Notes - Chapter 30 Chapter 30 Plant Diversity IIThe...

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