I came across a website where students can learn in an interactive way about animal cells.
You can add the labels for immediate feedback. The labels only attaches when it is correctly labeled.
Or you can take the quiz to be rewarded. If all questions are answered correctly, the student can see how a cell divides! If the answers are wrong, students can go to the tutorial. You hover over a part of the cell to read more about the functions of a ribosome, etc.
I love this interactive game. Students can learn individually, in groups or it can be used as a class project for teaching and revision purposes.