Differentiate Fruits and Vegetables Science Quiz For Kids Online. In this quiz students in 1st, 2nd and 3rd grade will learn how to categorize what are fruits and what are vegetables. It is often confusing at first and people tend to mix up the two as one. For example some people think carrots are fruits, some think vegetables must be green leaves and wonder why potatoes are considered as veggies. In this science quiz kids will look at items in a picture and decide if or not they are fruits or vegetables. This a multiple choice question science test for teachers to use as a homework tool or for homeschooling moms to make their task easier. Click start to begin.