Phloem · Botany

Which statement best describes the direction of phloem transport?

  1. It is always upward from roots to leaves
  2. It is always downward, moving continuously from leaves to roots
  3. Its direction depends on the locations of sources and sinks
  4. It occurs only from xylem to epidermis
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Correct answer: Its direction depends on the locations of sources and sinks

Phloem transport depends on the location of sources and sinks. Different sieve tubes can transport materials upward or downward at the same time in different parts of the plant.

Difficulty: Medium Question 11 of 20

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