Movement of Phloem Sap from a Source to a Sink

question 36

Multiple Choice

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

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