Lecture 13 � Tracheophytes � seed plants- gymnosperms and Magnoliophyta (Angiosperms

Lecture 13 � Tracheophytes � seed plants- gymnosperms and Magnoliophyta (Angiosperms

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Lecture 13 – Tracheophytes – seed plants: gymnosperms and Magnoliophyta (Angiosperms) A. Greatest invasion of land (any plants with seeds) 1. Seeds – protect embryo from drying, provide food for embryo - - Most of seed is food – gives baby plant energy to grow out of ground - Seed coat – keeps seed from drying out and helps the spread of it 2. Pollen – male gametophyte. Sperm (pollen is the common name). No water for fertilization - This is the male gametophyte(gamete-producing plant) or micro gametophyte (micro refers to male) - The pollen is taken to the female and it germinates (no water needed) B. Heterosporous – two kinds of spores (advanced) - Separate male and female gametophyte plants (dioecious) 1. Microspores – male gametophyte. Pollen (what produces the sperm). Sperm. 2. Megaspores – female gametophyte (megagametophyte); called the mature embryo sac (where egg is produced). Egg.
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C. Gymnosperms (fig. 27-4) 1. Pinophyta (phylum)– conifers, pines (make paper and wood out of) 2. Needles – (long and thin) megaphylls (because they have complex vascular systems; at least 2 major veins). Drought resistance (have reduced leaf surface area); can live under arid conditions (hot and dry) or extreme cold
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Lecture 13 � Tracheophytes � seed plants- gymnosperms and Magnoliophyta (Angiosperms

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