Bio153_Lecture7_Greenalgae-Plants_sv-1

Bio153_Lecture7_Greenalgae-Plants_sv-1 - Green Algae and...

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Unformatted text preview: Green Algae and Land Plants Green Algae traditionally been considered protists, but studied with land plants: (1) are the closest living relatives to land plants (2) the transition from aquatic to terrestrial life occurred when land plants evolved from green algae Green Algae * ancestors to land plants aquatic chloroplasts with double membrane chlorophylls a and b, starch cellulose green algae in symbiosis with fungi form lichen some live as endosymbionts in protists according to the fossil record, plants colonized land with fungi in a mutualistic association Importance of Plants produce oxygen build soil hold soil hold water in soil moderate local climate Importance of Plants dominant primary producers in terrestrial ecosystems provide the base of the food chain are the key to the carbon cycle on the land Importance of Plants provide most of our food supply as well as a significant percentage of the fuel, fibers, building materials, and medicines agricultural research began with the initial domestication of crop plants Artificial selection for plants with certain properties has lead to dramatic changes in plant characteristics Crops and Artificial Selection Plant-Based Fuels and Fibers Table 30.1 How Do Biologists Study Green Plants? 1. compare the fundamental morphological features of various green algae and green plants 2. analyze the fossil record of the lineage 3. assess similarities and differences in molecular traits such as the DNA sequences from selected genes Read Box 30.1: A model organism: Arabidopsis thaliana Analyzing Morphological Traits green algae are closely related to plants on the basis of several key morphological traits: chloroplast and cell wall structures green algae include species that are unicellular, colonial, or multicellular and that live in marine or freshwater habitats based on morphology, the major phyla of plants are grouped into three categories: nonvascular plants, seedless vascular plants, and seed plants . Morphological Diversity: Nonvascular Plants Nonvascular plants do not have vascular tissue to conduct water and provide support. Hepaticophyta (liverworts) Anthocerophyta (hornworts) Bryophyta (mosses) Morphological Diversity: Seedless Vascular Plants Seedless vascular plants have vascular tissue but do not make seeds....
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This note was uploaded on 02/01/2012 for the course BIOLOGY 153 taught by Professor Dr.arts during the Fall '10 term at University of Toronto- Toronto.

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Bio153_Lecture7_Greenalgae-Plants_sv-1 - Green Algae and...

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