Which of the following statement is correct concerning the flow of sap in xylem of trees? (a) In...

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Which of the following statement is correct concerning the flow of sap in xylem of trees?
(a) In the morning sap begins to flow first in the twigs and later in the trunk
(b) Flow is driven by high conc. of sugar in the vessel elements
(c) Flow from the roots to the twigs would be accelerated if the leaves are removed
(d) Rapid flow of water puts the xylem under a pressure much greater than atmospheric pressure.
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