Final answer:
Boys may have to cut their hair in school due to dress code or grooming policies. Shorter hair promotes uniformity, discipline, and practicality in the learning environment.
Step-by-step explanation:
The reason why boys often have to cut their hair in school can be attributed to a variety of factors, including cultural norms and practicality. In many schools, there may be a dress code or grooming policy that requires students to have shorter hair. This is often seen as a way to promote a sense of uniformity and discipline among students. Additionally, shorter hair can be more manageable and less likely to become a distraction in the learning environment. For example, long hair may obstruct a student's vision or become tangled during physical activities. Ultimately, the decision to require boys to cut their hair is made by the school administration based on established policies and considerations for the overall welfare of the students.