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Biology Notes 3-3-08

Biology Notes 3-3-08 - are needed This type of transport is...

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Biology Notes March 3, 2008 Sugar is manufactured due to photosynthesis. Where it is manufactured cannot consume all of the sugar, so it has to be stored or moved. Sugar is transported when sugar enters the companion cells and then moves into the STM. Water then diffuses into the STM by osmosis. The overall pressure inside the STM increases. Other locations in the plant body require sugars for growth, reproduction. A source is where sugars are in excess, they move to the sink which is where the sugars
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Unformatted text preview: are needed. This type of transport is known bulk flow. Sugar and water entering the STM has a positive pressure gradient. When sugar and water exit the STM there is a less positive pressure gradient. Aphids stab their style into the plant to attempt to strike one of the sieve tubes. The positive pressure forces the sugar into the aphid, they are small enough to not evoke wounding responses. Biology Notes March 3, 2008 Vocabulary: Sieve tube member Companion cells Pressure gradient...
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Biology Notes 3-3-08 - are needed This type of transport is...

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