Final answer:
Intercalary meristems located at the nodes enable stem elongation and add to the length of grass stems. Grasses have a unique ability to increase their stem length even after being grazed or mowed. This is due to the presence of intercalary meristems at the nodes.
Step-by-step explanation:
Internodal growth in grasses is facilitated by intercalary meristems located at the nodes, which allow the stem to elongate. These meristems add to the stem length and enable grass leaves to increase in length even after being grazed or mowed. Intercalary meristems are unique to grasses, and their presence at the nodes is what allows grass stems to telescope upward and produce inflorescences with flowers and fruits.