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Lecture

Biology - Day 9.docx

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Department
Biology
Course
BIOL 1130
Professor
Berkley
Semester
Fall

Description
Monday October 1, 2012 Food Storage Roots - Example – sweet potatoes, turnips, radishes  Store starch, Carbohydrates,  Biennials – 2 years to complete life cycle. (Second year flowering) Aerial Roots - Advantageous – orchids  Velican roots - retention Prop Roots - Corn, adventitious - Support (physically vs. wind) Propagative Roots - plants (Poplar) that develop aerial stems from buds on roots - Terminal “suckers” – fruit tree Buttress Roots - Provide support in shallow soils  fig tree, cypress tree Pneumatophores - Involved in gaseous exchange in flooded areas - Example  Cypress trees - Termed – “knees” Contractile Roots - Roots which “pull” developing bulbs into the soil column - Example  Bulbs, lilies Parasitic Roots - Obtain sugars from host plants - Have no chlorophyll production - Dodder (vine–like) Mycorhizae
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