Lecture 13, Ch. 30

Lecture 13, Ch. 30 - Lecture #13 Date _ Chapter 30 ~ Plant...

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Lecture #13 Date ________ Lecture #13 Date ________ Chapter 30 ~ Plant Diversity II: The Evolution of Seed Plants
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Seed Plant Reproductive Adaptations Seed Plant Reproductive Adaptations Reduction of the gametophyte : shift from haploid to diploid condition; female gametophyte and embryo remain in sporangia (protection against drought and ionizing radiation on land?) Advent of the seed multicellular sporophyte embryo with food supply and protective coat; heterosporous (two types of spores): megaspores--->female gametophyte--->eggs; microspores---> male gametophyte--->sperm Evolution of pollen : develop from microspores which mature into the male gametophytes; resistant and airborne for a terrestrial environment; eliminated water (sporopollenin coats)
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Gymnosperms Cone-bearing plants Lack enclosed chambers (ovaries) for seeds Ovules and seeds develop on specialized leaves called sporophylls Ginkgo, cycads, and conifers All are “evergreens”
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This note was uploaded on 09/22/2009 for the course BIOL BIOL 51 taught by Professor Janetkoprivnikar during the Spring '08 term at Pacific.

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Lecture 13, Ch. 30 - Lecture #13 Date _ Chapter 30 ~ Plant...

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