The title of the book has a direct connection with the plot and strong symbolism. The mockingbird throughout the book holds important meanings in several different situations. When Jem and Scout cross near the Radley's yard, the mockingbird (as a vulnerable creature) symbolizes a threat of violence and their vulnerability to it.
The answer to the question genetic modification of cash crop foods are Audience: people who care about their food and Purpose: let people know more about food.
