Lab 7_plants_part2_2010_student

Lab 7_plants_part2_2010_student - Lab topic 8: Plants II...

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Lab topic 8: Plants II Seeded Plants pp. 147-167
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Evolution and diversity Today’s lab
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SEED plants! (1-5 are derived traits) Earth dried up 1. Seed : consists of embryo and its food supply (acutally made of female gametophyte tissue) protected by a seed coat to withstand drought 2. Pollen grains are male gametophytes enclosed in a protective wall. Once it reaches ovule, it forms a pollen tube that discharges sperm to ovule Plant sperm is no longer motile -> no longer depends on water to get to egg Pollen travel by wind ( gymnosperms ) or by specific pollinators ( angiosperms )
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3.reduced gametophyte Fig. 30-2 Reduced (usually microscopic), dependent on surrounding sporophyte tissue for nutrition Reduced, independent (photosynthetic and free-living) Gametophyte Sporophyte (2 n ) Sporophyte (2 n ) Gametophyte ( n ) Sporophyte Example Gametophyte ( n ) Dominant Dominant Dominant Reduced, dependent on gametophyte for nutrition
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This note was uploaded on 10/29/2010 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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Lab 7_plants_part2_2010_student - Lab topic 8: Plants II...

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