class notes 2.22

class notes 2.22 - Bio-1006: 2/22/10 Plants: basis for all...

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Bio-1006: 2/22/10 Plants: basis for all food changes, all energy and proteins and nitrogen are fixed on the planet by plants o Eukaryotic- have a nucleus o Multi-cellular- made of many cells which create an organism o Autotrophs (photosynthetic) – chlorophyll (CO2 + H2O (sunlight) O2 + glucose o Have embryo (sometimes within seed)- sexual reproduction o Cell walls made of cellulose (1 st cell wall made of cellulose, woody plants have a 2 nd cell wall made of lignin) o Terrestrial plants Phytoplankton (single celled, microscopic algae): microscopic algae which make up the majority of productivity on our planet o Some single celled, some are multi-cellular, they are the primary producers of the oceans o Diatoms- single celled algae which have a shell made of silicon dioxide (glass), they are rich in oils The crude oil we use today is the result of millions of years of compaction of the diatoms and collection of the oil from these tiny algae (diatomaceous earth) Advantages to plant life in the water: easier existence o Surrounded by water o No cuticle needed o No transport systems needed o Nutrients and gases are dissolved in the water o Metabolic wastes removed by diffusion Advantages to plant life on land:
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class notes 2.22 - Bio-1006: 2/22/10 Plants: basis for all...

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