How Can Researchers Confirm That Phloem Moves from a Source

question 44

Multiple Choice

How can researchers confirm that phloem moves from a source to a sink?

• A)They can observe aphids and cut off their beaks.
• B)They can study the cause of maple sap flow in producing syrup.
• C)They can observe the effects of girdling a tree below the level of the majority of leaves.
• D)They can use radioactive tracers to measure the flow of sap between two distances over time.
• E)They can observe the uptake of ink into the stem of celery.

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Financial contributions required by law to be made by a non-custodial parent to support their minor children.

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