Where does lengthening and widening occur in plant roots?
Options:
- (A) meristems
- (B) Epidermis
- (C) cracking
- (D) allow growth
- (E) buds
- (F) stamens
- (G) epidermal
- (H) fruits Let's solve this problem gradually.

Roots have primary and secondary meristems for growth in length and width. Growth occurs in meristems. Without meristems, roots couldn't lengthen or widen. So the final answer is (A).