Which sequence places the tissues in the stem of a young tree in the correct order, starting from the exterior of the plant with the outermost layer of stem tissue, and moving toward the centre?
a. secondary phloem ? primary xylem ? secondary xylem ? primary phloem
b. primary phloem ? secondary xylem ? secondary phloem ? primary xylem
c. primary phloem ? secondary phloem ? secondary xylem ? primary xylem
d. primary xylem ? secondary xylem ? secondary phloem ? primary phloem
Ans: c. primary phloem ? secondary phloem ? secondary xylem ? primary xylem
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