Profile allows the user to check their personal data while also connecting with friends
Tasks allow the user to find, create, and perform tasks
Grow introduces the gamification portion of the app, allowing user to create and build a garden around the area they live.
Compete allows the user to see how well they are doing with other users/teams in the general area.
The task was centered around answering a design question and working through the process of creating the best experience for a user demographic. To that extent, a large portion of the project is lost when not considering the process work. For this reason I recommend reviewing the Gaia's Field PDF