41. According to the pressure-flow model of phloem transport, long-distance movement of sucrose depends primarily on _____.
(A) active transport of water into sieve-tube elements at the source
(B) capillary forces within sieve plates
(C) a pressure difference established between source and sink tissues
(D) diffusion of sucrose through plasmodesmata over long distances
(E) bulk flow driven by transpiration in xylem vessels
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統計: A(1), B(0), C(6), D(0), E(0) #3852895
統計: A(1), B(0), C(6), D(0), E(0) #3852895