Which of These Is Not a Reason That Aphids Feed

question 5

Multiple Choice

Which of these is not a reason that aphids feed on phloem?

• A)Phloem is under positive pressure,so when the aphid pierces a phloem tube,sap is pushed into its mouth.
• B)Xylem is under negative pressure,so it would be very difficult to suck the fluids.
• C)Phloem contains high concentrations of sugars,as well as some minerals and other nutrients.
• D)Xylem contains mostly water and fewer nutrients.
• E)In soft herbaceous plants,phloem is more accessible than xylem.

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