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BI111 (176)
Tristan Long (166)
Lecture

Chapter 25.docx

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Department
Biology
Course
BI111
Professor
Tristan Long
Semester
Winter

Description
Chapter 25Important of land plantsImportant evolutionary eventDramatically influence both terrestrial aquatic and atmospheric conditionsCreated new environmental niches300000 living species 10 phylaimportant to todays ecological processescarbon water nitrogen etcprimary producers in terrestrial food webDomestication and cultivation of plantsLand plants first evolved in the Ordovician periods 488317 to 443715 million years agoEarly to middle ordocvician mild climate with moist atmosphereMarines and freshwater organism had dramatically changed atmosphere Cyanobacteria use water as a reducing agent producing atmospheric O as a byproduct but CO levels were still 2210X greater than todayThe origin of land plants HwoAncestor was likely a Charophyte a type of green algae aka StonewortMulticellular with cellulose cell walls2 forms of chlorophyll a and bMost cells are photoautotrophicStorage of products of photosynthesis as amylose starch
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