[Campbell Biology P.816] Based on the 'Addition of secondary xylem and phloem cells' diagram... | Practice Question

Based on the 'Addition of secondary xylem and phloem cells' diagram and accompanying text, what is the typical pattern of cell production by the vascular cambium?

  • A: Equal amounts of secondary xylem and phloem are produced to the outside and inside, respectively.
  • B: Secondary xylem cells (X) are produced to the inside of the cambium, and secondary phloem cells (P) are produced to the outside, with typically more xylem.
  • C: Cork cells (C) are produced to the outside of the vascular cambium, increasing circumference.
  • D: Only xylem cells are produced, forming the bulk of the plant's length.

Explanation

The diagram and text clearly state that when a vascular cambium cell divides, it produces secondary xylem X to the inside and secondary phloem P to the outside. It also mentions that 'usually many more xylem cells are produced,' contradicting the idea of equal amounts.