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Chapter 30

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

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Chapter 30 Plant Diversity II: The Evolution of Seed Plants I. Concept 30.1: The reduced gametophytes of seed plants are protected in ovules and pollen grains a. Characteristics common to all seed plants i. Seeds ii. Reduced gametophytes iii. Heterospory 1. Produced different male and female spores (size and how they develop) iv. Ovules 1. Structure where the seeds develop v. Pollen 1. Frees the seed bearing plants for the need of water to reproduce II. Gametophyte/Sporophyte relationships a. Figure 30.2! **** b. Ferns and other seedless vascular plants i. Sporophytes = dominant c. Seed plants i. Gametophyte = reduced, dependent on surrounding Sporophyte tissue for nutrition ii. Sporophyte = dominant d. Gametophytes of seed plants develop within the walls of spores retained within tissues of the parent Sporophyte e. No longer dependent on water for fertilization III. Ovules and Production of Eggs a. An ovule consists of a megaspore, spore wall, megasporangium, and protective integuments IV.Pollen and production of Sperm
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a. Microspores develop into pollen grains i. Contain male gametophytes b. Pollen is coated for sporopollenin (waterproof) c. Pollen can be dispersed by air or animals, eliminates the need for water in fertilization V. If a pollen grain germinates a. It gives rise to a pollen tube that discharges sperm into the female gametophyte within the ovule VI.A seed a. Develops from the whole ovule b. Includes Sporophyte embryo, food supply, protective coat i. Protective integument becomes the seed coat that protects the embryo and its food source VII. Which of the following does not apply to gymnosperms or angiosperms a. Vascular tissues – they do have vascular tissue so cant be this b. Diploid dominance c. Single spore type – Heterospory (make 2 types of spores… microspores that develop into male gametophyte and the mega spore
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Chapter 30 - Chapter 30 Plant Diversity II The Evolution of...

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