Question

Cells responsible for increase in diameter of the stem and root of dicot plants

Answer 1

meristematic cells- they  divide continuously increasing the girth i.e. diameter of roots and stem

Answer 2

Answer:

Cork Cambium and Vascular Cambium.

Explanation:

The cells responsible for increase in diameter of the stem and root of dicot plants are the Cork Cambium and Vascular Cambium. This is basically secondary growth where unlike the primary growth cell division takes place in the lateral mainstream or the cambia, leading to an increase in the width of the plant.