Practice question
Question
Phloem translocation is bidirectional because:
Explanation
Go with B — Different sieve tubes carry flow in opposite directions. Under PHLOEM TRANSLOCATION, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Phloem sap flows both ways in one sieve tube; C) Diffusion occurs freely; D) Xylem assists phloem. When two options sound similar, choose the one that matches the textbook definition most tightly.
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