Cells at the Top of a Tree Have a Higher

question 112

Multiple Choice

Cells at the top of a tree have a higher concentration of sugars than cells at the bottom.How might this fact assist a tree in moving water upward from its roots?

• A)Cells with high concentrations of sugar are more dense.As these cells migrate downwards,cells containing fresh water are able to migrate upwards.
• B)Water is pushed upwards by osmostic pressure.
• C)It doesn't.In fact,water makes it to the top of a tree because that is where the water molecules are being evaporated.
• D)Fresh water is drawn upwards to the sugar containing cells by way of dipole-dipole molecular interactions.

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