Exam 3 Notes

Exam 3 Notes - BIOL 1202 Exam 3 Notes...

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BIOL 1202 Exam 3 Notes Chapter 30: Plant Diversity II: The Evolution of Seed Plants Concept 30.1: Seeds and pollen grains are key adaptations for life on land  Characteristic common to all seed plants 1. Seeds 2. Reduced Gametophytes 3. Heterospory 4. Ovules 5. Pollen Gametophyte/sporophyte relationships o Gametophytes of seed plants develop within the walls of spores retained within  tissues of the parent sporophyte  o No longer dependent on water for fertilization
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2 Oveules and Production of Eggs o An ovule consists of megasporangium,  megaspore, and protective integuments Pollen and production of sperms o Micorspores develop into pollen grains o Pollen can be dispersed by air or animals, eliminates the need for water in  fertilization
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3 If a pollen grain germinates,. . o It gives rise to a pollen  o 30.3b  A Seed o Develops from the whole ovule o Includes sporophyte embryo, food supply,  protective coat  o Pine seed pic o Figure 30.3c Concept 30.2: Gymnosperms bear “naked” seeds,  typically on cones Gymnosperms include… o Phylum cycadophyta Sago palms o Phylum Ginkophyta
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4 o Phylum Gnetophyta  o Phylum Coniferophyta Pines, Firs, Junipers, Sequoias A closer look at the Life Cycle of a Gymnosperm o Key features of the gymnosperm life cycle include Dominance of the sporophyte generation The role of pollen in transferring sperm to ovules
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5 No water required The development of seeds from fertilized ovules  o Pine Life Cycle Figure 30.6
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6 Concept 30.3: The reproductive adaptations of angiosperms include flowers and fruits Angiosperms, a.k.a., flowering plants “covered seeds”
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7 Derived traits are the reproductive structures called flowers and fruits The most widespread and diverse of all plants 250,000 species 90% of all extant plant  species Angiosperm Diversity Amborella Found in the South  Pacific Water Lily Star Anise Southern Magnolia Figure 30.12 Figure 30.13 Figure 30.13
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8 Monocots Grasses, palm trees, lilies, wheat, barley, several grains One seed leaf Eudicots The majority of angiosperms Two seed leaves Trees, bushes, zucchini
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9 Flowers Specialized for asexual reproduction Specialized shoot with modified leaves Sepals – enclose the flower protect flower before it blooms Petals – brightly colored, attract pollinators smaller petals for flowers that distribute pollen through the  wind Stamens – produce pollen Contains the filament Carpels – produce ovules Ovules produce the megasporangium Fruits A mature ovary Ovary matures after fertilization of ovules Can be carried by wind, water, or animals, enhancing dispersal Figure 30.8 Figure30.9 The Angiosperm Life Cycle
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Exam 3 Notes - BIOL 1202 Exam 3 Notes...

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