Question

The vascular system of a three-
year-old dicot stem consists of
a) 2 nngs of xylem and 2 of phloem.
b) 2 rings of xylem and 3 of phloem
c) 3 rings of xylem and 3 of phloem.
d) 3 rings of xylem and 1 of phloem.​

Answer 1

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d) 3 rings of xylem and 1 of phloem.

The xylem rings represent the age of the plant as a result of the fluctuating activity of the vascular cambium in a year, and since it is 3 years old there will be 3 rings of the xylem present and contains 1 phloem.