CSU AGRI 116 - Plant Biology, Evolution, and Ecology (5 pages)

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Plant Biology, Evolution, and Ecology



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Plant Biology, Evolution, and Ecology

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A summary of the evolution of plants.


Lecture number:
2
Pages:
5
Type:
Lecture Note
School:
Colorado State University- Fort Collins
Course:
Agri 116 - Plants and Civilizations (GT-SS3)

Unformatted text preview:

AGRI 116 1nd Edition Lecture 2 Outline of Current Lecture I Plant Biology Evolution Diversity a Photosynthesis b Metabolism III Plant interactions with Animals a Pollination b Dispersal c Defense Current Lecture Evolution of Plants 500 Million Years Ago Algae Algae showed up first b c there wasn t a lot of oxygen in the atmosphere Algae are photosynthetic Tissues are not organized into organs No leaves or roots Seaweed obtains nutrients from sun or osmatryphy pulled in through osmosis Moss Showed up around the same time as algae Bryophytes non vascular plants By not having vascular systems particularly lignin they can t grow up get tall grow diferse structures Lignin is a key feature of higher more advanced plants No flowers fruit combs or seeds Need high moisture for reproduction Don t really have a root system These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 420 ish Million Years Ago Ferns First true land plants Started showing lignin and ability to grow leaf structures helpful with photosynthesis They have vascular systems which allow them to evolve into larger size Reproduce and survive without being immersed in water Reproduce through spores not seeds Seedless vascular plants 380 ish Million Years Ago Cycads and conifers Gymnosperm naked seeded i e pine cones Immense conifer forests pull carbon out of the air and bring it down to bind it as organic compounds Clean air 140 250 ish Million Years Ago Angiosperms Seeds that are enclosed in a fruiting body i e apple tree Commonly know as fruiting or flowering plants Broken down into monopods and dipoids o Monocots arrowhead lily orchid one nutrient storage area cotyledon o Dicots buttercup rose aster two storage areas cotyledons When the angiosperms came onto the scene it allowed plants to diversify the planet Photosynthesis Photosynthesis is breaking down energy into plant food engine for plant metabolism This



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