Final answer:
Group norms are crucial in planning community health education as they shape members' perceptions and behaviors within a community, leading to more culturally-sensitive and effective interventions.
Step-by-step explanation:
A nurse recognizes the importance of group norms when planning community health education because they significantly influence members' perception of the community. Norms guide behavior and create a sense of shared expectations within a group. Awareness of these norms can be helpful in planning interventions that are culturally sensitive and more likely to be accepted. When a nurse understands and considers these norms, health education can be tailored to maintain the group's integrity and provide various supports to members, fostering adherence to beneficial health practices and cultivating a cooperative environment for change.