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Lecture 9

Lecture 9 - Plants.pdf

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Christoph Richter

Lecture 9 - Plants Thursday, 6 February, 2014 11:36 AM Today's Topics: Announcements: Homework:  Land plant reproduction  Raffle tickets for book Lab 4 package - $3/ticketor $5/2 Lab test 1  Plant life cycles  Using animals tickets Assignment 2 Lecture Topic: Key adaptations of land plants in order to survive on land have two purposes:  Survival - in air, with lack of water for nutrients and support ○ Cuticle ○ Pores or stomata ○ Vascular tissue  Reproduction ○ Embryo is contained and nourished by the parental plant  Problem:the embryo has to grow in the same place as the parental plant - competitionfor resources □ This happens in horsetails and mosses □ Problem is solved by using seeds ○ Seeds contain the embryo and nutrients and are a way to transport the embryo away from the parent plant  This avoids competitionfor resourcesbetween parent and child plants Angiosperms have their own set of adaptations for reproduction on land.  Two male sperm and one female egg are used in fertilization ○ One sperm fertilizes the egg to form the 2n zygote ○ One sperm c
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