The Question and Answer section for A Grain of Wheat is a great resource to ask questions, find answers, and discuss the novel.
Many different grains and types of flour are used to make bread. What chapter or event does your question pertain to? This novel is about the struggles in Kenya during the early 1950s. I'm not sure how your question relates.
There are probably a lot of them. Are you looking for something particular?
I don't think GradeSaver has one but you can always do a search on the internet.