Biology 102Lecture 17Outline of Last Lecture:I. ProtistsII. Animal-Like ProtistsOutline of Current Lecture:I. Clicker QuestionsII. Protist EvolutionIII. Plants and Fungi Clicker QuestionsWhat challenges did plants face when colonizing land?a. Competing with other plants for nutrientsb. Dry environmentc. Temperature d. Reproduction on lande. CO2 from airf. SupportWhy aren’t algae considered plants?a. They have a different type of chlorophyllb. They lack the roots and leavesc. They lack vascular tissued. They lack a cuticle stomatae. They don’t protect the developing embryo of offspringf. All of the aboveProtist EvolutionDiatom- single cell plant like protists- Use flagella to move colonies aroundColonial organism- lose federation of cells, not enough specialization to be considered multicellular- Volvox: colonial organismo Loose federation of cellso Some degree of specializationo Ex. some make food for the colony, make gametesBiology 102 Not true multicellularityProtists are ancestors to plants, animals, and fungiPlants and FungiPlants and fungi colonized land together- Plants did not make it to land by themselves - Fungi and plants used each other symbiotically to get to landPlants: animals and people use them- Perform photosynthesis, remove CO2 from the atmosphereCharophytes: the difference between algae and plants - Algae doesn’t have a true root like a
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