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Lecture 14

BIO SCI 94 Lecture 14: Green Algae and Land Protists Part 1Premium


Department
Biological Sciences
Course Code
BIO SCI 94
Professor
Brad Hughes
Lecture
14

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02/06/19
Introduction
Green plants-green algae and land plants
Green algae-important photosynthetic organism in freshwater habitats
Land plants- photosynthetic in terrestrial environment
Green algae considered protists, why we study them with land plants:
Closest relatives to land plants
aquatic→ terrestrial life happened when green algae evolved into land
plants
Land plants-first organisms to live exposed completely to air
Before land plants, terrestrial life-bacteria, archaea, single celled protist
Plants transformed nature of life
Ecosystem Services Potential: Green Plants
Biologist study plants, why? Plants are interesting, humans can't live without
plants
Plants needed for food, oxygen, fuel, building material, clothing, rope,
paper, basket fibers
Agriculture, forestry, horticulture supported by biological science
Why Do Biologist Study the Green Plants?
Study plants harmful to people:
Weeds lower crop productivity
Invasive species degrade natural areas
Plants Provide Ecosystem Services
Ecosystem consists of:
All organism in area
Physical components of environment
Atmosphere
Precipitation
Surface water
Sunlight
Soil
Nutrients
Green algae/land plants provide ecosystem services
Help life supporting traits of physical components of ecosystem
Green plants change environment→ helps other organisms
Ecosystem services provided:
Oxygen from oxygenic photosynthesis
Provide food for decomposers→ help soil
Hold soil, prevent nutrients from being lost from erosion
Hold water in soil
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