Students are asked to predict what would happen to the algae in a pond if fertilizer from a field was washed into the pond. They are also asked to explain why they think the fertilizer would have the predicted effect.This constructed response item is a sample of test items prepared and used in past National Assessment of Education Progress (NAEP) administrations. (see About NAEP) The URL link will take the user to the test item. From there, the user may choose to access information regarding general performance on this item, the content from which the item is derived, a scoring guide and student responses, and detailed data regarding performance on this items by various subgroups. The user may choose to collect items and add them into a data base which can later be printed by clicking on Add Question in the upper right hand corner of the screen. NAEP Reference Number: 2000-4S9 No.:9