Lecture16_handout_30Sep11 - BioEE1780 Evolution and...

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BioEE1780 Evolution and Biodiversity Today’s lecturer: Cole Gilbert Lecture 16: Sept. 30, 2011 Diversity 5 page -1 Greening of the Land: The rise of higher plants Readings: Life, 9 th ed. Chapter 28, sect 28.3, pp. 602-605; Chapter 29 In the last lecture we saw how plants began to move on to land, first with liverworts that hugged the ground and then with mosses that achieved a slightly higher stature. Nevertheless, primitive terrestrial plants are still small of stature and are restricted to habitats that are moist or have very high humidity. They have overcome some of the challenges of moving on to land, such as desiccation and increased UV radiation, but they have evolved neither the structural support that would allow them to get big in the struggle for sunlight nor the vascular system to move nutrients around in a big body. In this lecture we will start with a discussion of some other primitive land plants: lycophytes, horsetails, and ferns. They were the first plants to evolve a sophisticated vascular system of xylem
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This note was uploaded on 01/01/2012 for the course BIOEE 1780 taught by Professor Harrison during the Fall '10 term at Cornell University (Engineering School).

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Lecture16_handout_30Sep11 - BioEE1780 Evolution and...

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