Name one common defect found in coffee beans.

Quakers are indeed a common defect found in coffee beans. They refer to underdeveloped or immature beans that have not fully ripened when harvested. These beans often lack the desirable flavor profile and can contribute to off-tastes in the final brew. Since Quakers have a different density and typically do not roast uniformly compared to properly ripened beans, they can negatively affect the overall quality of the coffee. Identifying and removing these beans during the sorting process is crucial for achieving a high-quality cup.

While other choices may refer to issues with beans, they do not specifically denote a common defect related to underdeveloped beans like Quakers do. Overripe beans can indeed affect flavor, but they are not as distinctively labeled a defect as Quakers. Light beans may imply lighter roasts, and burnt beans typically result from over-roasting but don't represent an inherent defect in the beans themselves prior to roasting. Hence, Quakers stand out as a clear example of a common defect found in coffee beans.