what constitutes 1 cup for fruits & veggies

with weight watchers you are asked to consume 5 servings of fruits and veggies.... 1 serving is 1/2 a cup....
so what constitutes 1 cup for fruits & veggies?
- 1 small apple
- 1 large banana
- 2 large stalks of  celery
- 2 cup raw spinach
- 6 baby carros

more here:
http://www.fruitsandveggiesmatter.gov/what/examples.html