Identifying phloem and stomatal flows in leaf transport

Steps:

• Define translocation as sugar transport downward in phloem from source (leaf) to sinks.
• Define transpiration as upward water movement in xylem followed by evaporation through stomata.
• Examine diagram arrows: 1 enters leaf (xylem up), 2 cycles internally, 3 exits via phloem (downward), 4 exits stomata (water vapor out).
• Match: arrow 3 aligns with phloem translocation, arrow 4 with stomatal transpiration.

Why C is correct:

• C pairs translocation with phloem flow (arrow 3) and transpiration with stomatal loss (arrow 4), matching vascular tissue definitions in plant physiology.

Why the others are wrong:

• A misassigns upward xylem entry (1) to translocation and internal flow (2) to transpiration.
• B incorrectly links internal cycle (2) to translocation and unrelated (3) to transpiration.
• D swaps phloem exit (4) for translocation and entry (1) for transpiration.

Final answer: C