Human digestive system quiz diagram online, complete digestive system, all parts of the digestive system. This is an interactive online biology diagram for students to label. It features all organs in the digestive system as follows: mouth, esophagus, pancrease, gallbladder, liver, large bowel, small bowel, stomach, duodenum, etc. The order of the labels has been shuffled in this quiz. Students are required to look at the diagram and rearrange the labels to correspond exactly to the indicated part. For more offline practice, there is a printable worksheet on the digestive system which can be downloaded directly. Also, start reviewing how digestion occurs in the digestive tract.| Multiple choice quiz featuring biology test questions for students to review biology topics. Click on each question and select the correct answer below and submit. Feedback is instant and at the end you will get your score. Biology quiz for 2nd, 3rd, 4th, 5th, 6th, 7th grades to review. Focus: Online science Trivia | science quiz questions | Biology Test | Biology questions.