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Advantage and disadvantages of Fensom and Spanner Electroosmotic Flow Hypothesis
The model has several advantages over Munch's model. The presence of P- proteins, and the occlusion of sieve plate pores by filaments bearing negative fixed charges are in favour of this model. While these filaments would greatly impede the flow of phloem sap under a pressure gradient, they would make electroosmotic flow more efficient. The negative aspects of this model are:
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HISTORY ON CLASSIFICATION IN BIOLOGY
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