We see leaves all around us. With these green plants, life will not exist on Earth as we know it. Did you know that? Plants capture sunlight through their leaves and convert it into start which serves as the bases of nutrients for almost all forms of existence. Without green plants and especially their leaves, there will be no food for us all. To start understanding how the process (called photosynthesis) operates, it is important to learn how to label the leaf cross section diagram. This page features a leaf diagram to label through an online worksheet. Students are required to drag and drop the parts of the leaf’s cross section and check is they got it right or wrong. This is an interactive online biology game which students can use to practice at home or in the classroom. This exercise is for students in 1st, 2nd, 3rd, 4th, 5th, 6th and 7th grades.