Pressureflow Hypothesis

Phloem Xylem

Phloem Xylem

^^ Sugar from source enters phloem.

TA Water from xylem enters phloem.

^^ Pressure pushes sugars down.

figure 29-12

O Sugars from a source enter the sieve tubes of the phloem. © Water moves from the xylem to the phloem by osmosis. O The water creates pressure that moves the sugars down the phloem. O The sugars exit the phloem and enter the sink, where they will be used or stored.

Sugar from phloem enters sink.

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