Movement of phloem sap from a source to a sink _____

A) occurs through the apoplast of sieve-tube elements
B) depends upon active transport of sugars into the sieve-tube elements
C) depends on tension, or negative pressure potential
D) depends on active transport of water into sieve- tube elements at the source
E) results mainly from diffusion of sugars into companion cells


Answer: B

Biology & Microbiology

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