試題詳解

31. Which of the following does not appear to involve active transport across membranes?
(A) the movement of sugar from mesophyll cells into sieve-tube members in corn
(B) the movement of mineral nutrients into cells of the root cortex
(C) K⁺ uptake by guard cells during stomatal opening
(D) the movement of mineral nutrients from the apoplast to the symplast

(E) the movement of sugar from one sieve-tube member to the next