Question

Vascular cambium produces

(a) primary xylem and primary phloem

(b) secondary xylem and secondary phloem

(c) primary xylem and secondary phloem

(d) secondary xylem and primary phloem

Answer 1

Correct option (b) secondary xylem and secondary phloem

Explanation

Vascular cambium is formed by fasciular and interfascicular cambium. lt leads to secondary growth in dicot roots and dicot stems. Cells of vascular cambium, known. as fusiform. initially produce secondary phloem on the outside and secondary xylem on the inner side.

Youngest xylem layer occur inner to vascular cambium while oldest layer of secondary xylem is found outside the primary xylem or towards pith. In case of phloem, youngest layer of secondary phloem lies just outside the vascular cambium while oldest layer is towards outside, inner to primary phloem.