The Existence of a Hydrostatic Pressure Gradient in Phloem Tubes

question 33

Multiple Choice

The existence of a hydrostatic pressure gradient in phloem tubes can be accounted for by

• A)the fact that the leaves are higher than the roots, which means that gravity creates pressure.
• B)the diffusion of water from one sieve-tube cell to the next.
• C)the loading of sugars into phloem at sources and removal of sugars at sinks.
• D)the active transport of water from sugar sources to sugar sinks.

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