Question

When secondary growth in thickness is initiated in a dicot root, which of the following happens first?

• A. Cambial initials between xylem and phloem will divide.
• B. Pericycle strands, outside the primary xylem will divide.
• C. Periclinal division takes place, so that the cambium becomes circular.
• D. Parenchymatous cells between xylem and phloem become meristematic.

Answer 1

The correct option is D Parenchymatous cells between xylem and phloem become meristematic.

Dicot root shows secondary growth in thickness. Dicot root possess 2-4 xylem and phloem patches. These patches are separated by parenchymatous cells. The parenchymatous tissue present in between xylem and phloem become meristematic in later stages. These are called as cambium ring.

Thus, the correct answer is option D.