Transport in Plants and Animals
Question 1 of 30
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In a tall tree on a hot, dry, windy day, xylem vessels are at risk of collapse. Which structural feature most directly prevents collapse while still allowing upward water flow?
Select one option.
A
Thickened lignified secondary walls in xylem vessels
B
Large stomatal pore diameter in the lower epidermis
C
Presence of companion cells alongside xylem vessels
D
Sieve plates with pores in the xylem
E
High concentration of sucrose in xylem sap
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