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BIO153H5 (147)
Chapter 30

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University of Toronto Mississauga
Christoph Richter

Chapter 30 Green Algae and Land PlantsThe green algae compromise two major types of organisms the green algae and the land plantsGreen algae are important photosynthetic organisms in aquatic habitats lakes ponds and other freshwater settingsAlthough green algae have traditionally been considered protists it is logical to study them along with land plants for reasons 1they are the closest living relative to land plants and form a monophyletic group with them2transition from aquatic to terrestrial life occurred when land plants evolved from green algaeAn ecosystem consists of all organisms in a particular area along with physical components of the environment such as the atmosphere precipitation surface water sunlight soil and nutrients ThetransitionofplantsfromfreshwaterenvironmentstolandoccurredjustonceWhichofthefollowingstatementsisatruedescriptionoftracheidsLackcytoplasmRosebushesfernsandpinetreesreleasesporesthecommonlyvisibleformofmossesreleasesgametesGreen algae and land plants provide because they enhance the ecosystem services lifesupporting attributes of the atmosphere surface water soil and other physical components of an ecosystem Green plants alter the environment in ways that benefit many other organisms In the process of stripping electrons from waterplants release oxygen molecules O2 as a byproduct Leaves and roots and stems that are not eaten when they are alive fall to the ground and provide for worms fungi bacteria archaea protists and other decomposers in the soil These organisms add organic matter to the soil which improves soil structure and the ability of soils to hold nutrients and water By taking up nutrients in the soil plants prevent the nutrients from being blown or washed away When areas are devegetated by grazing farming logging or suburbanization large quantities of soil and nutrients are lost to erosion by wind and waterPlant tissues take up and retain water Intact forests prairies and wetlands also prevent rain from quickly running off a landscape plant leaves soften the physical impact of rainfall on soil and plant organic matter builds the soils waterholding capacity
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