The purpose of this experiment was to assess the effects of explaining the significance of classifying objects upon learning their features. The text was on the morphology of monocotyledons and dicotyledons. The advance information described the significance of classifying seed plants into monocotyledons and dicotyledons, i. e. the difference found in their ways of adaptation. The main results were as follows: The advance information facilitated deep learning of the text it made the learning more significant. The obtained results were discussed from the viewpoint of science education.