Final answer:
Meristematic tissue in grass blades is found at the base of the blade, specifically in the intercalary meristem, which enables growth in length and recovery from damage like mowing.
Step-by-step explanation:
Meristematic tissue stays at the base of the grass blade. In grasses, the type of meristematic tissue responsible for the elongation of the leaf blade is the intercalary meristem. This meristem is located at the bases of leaf blades and at nodes (where leaves attach to a stem) and is a characteristic feature of monocots like grasses. The intercalary meristem allows for the growth in length of the grass blades, enabling them to recover from damage such as grazing or mowing.