1202_test_3

1202_test_3 - 1 2/27/07 Test 3 Chapter 30 Plant Diversity...

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Unformatted text preview: 1 2/27/07 Test 3 Chapter 30 Plant Diversity II: The Evolution of Seed Plants Chapter 30 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 (spores that will always develop into male parts, and there are ones that will always develop into female parts.) 4. Ovules 5. Pollen Gametophyte/ Sporophyte relationships *Gametophytes of seed plants develop within the walls of spores retained within tissues of the parent sporophyte *No longer dependent on water for fertilization Figure 30.2 Heterospory: The Rule Among Seed Plants *Seed plants evolved from plants that had both megasporangia ( female symbol gametophytes) and microsporangia (male symbol gametophytes) Figure (pg586) Ovules and production of Eggs *An ovule consists of a megasporangium, megaspore, and protective integuments Figure30.3a Pollen and Production of Sperm *Microspores develop into pollen grains-Contain male gametophyte *Pollen can be dispersed by air or animals, eliminates the water requirement for fertilization Figures If a Pollen Grain germintates,;;; *It gives rise to a pollen tube that discharges two sperm into the female gametophyte within the ovule Figure 30.3b 2/20/08 A Seed *Develops form the whole ovule 2 *Includes sporophyte embryo, food supply, protective coat Figure 30.3c Which does not apply to gymnosperms or angiosperms?-Vascular tissues-Diploid dominance C-Single spore type-Cuticle with stomata Concept 30.2: Gymnosperms bear naked seeds, typically on cones Gymnosperms include Figure 30.4 Gymnosperm Evolution *Fossils reveal that by the late Devorian plants called progymnosperms had some characteristics of seed plants *Gymnnosperms dominated Mesozoic terrestrial ecosystems-Known as the Age of Cycads Figure 30.5 A Closer Look at the Life Cycle of a Gymnosperm *Key features of the gymnosperm life cycle include: 1. Dominace of the sporophyte generation 2. The role of pollen in transferring sperm to ovules-No water required 3. The development of seeds fom fertilized ovules Pine Life Cycle Figure 30.6 Concept 30.3: The reproductive adaptations of angiosperms include flowers and fruits *Angiosperms, aka, flowering plants-Covered seeds *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 Gymnosperms and angiosperms have the following traits in common except____-seeds-pollen-vascular tissue C-ovaries-ovules 3 Flowers *Specialized structure in angiosperms for sexual reproduction *Specialized shoot with modified leaves-Sepals: enclose the flower-Petals: brightly colored, attract pollinators-Stamen: produce pollen-Carpel: produce ovules Figure 30.7 Fruits *Typically consist of a mature ovary-Ovary matures after fertilization of ovules *Can be carried by wind, water, or animals, enhancing dispersal Figure 30.8 and 30.9Figure 30....
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This note was uploaded on 03/31/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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1202_test_3 - 1 2/27/07 Test 3 Chapter 30 Plant Diversity...

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