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-HADLEY cell circulates air between topics and subtropics (approximates real world well). Warm air rises at the equator-As the flow moves poleward, it begins to cool and sinks at 20Â°-35Â° latitude.-Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums.-FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums. -FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.
What drives phloem transport? Lower water potential in the phloem; water flows from xylem to phloem and creates a pressure gradient that drives translocation of sugar What is the exact process by which sugar moves from source companion cells to sink companion cells (aka pressure flow model) Sugar is loaded into the phloem and water follows by osmosis due to the high pressure gradient. Then sugar is unloaded from phloem and water follows by osmosis due to a low pressure gradient.