HSA 2007 Biology Item 14
- CID
- CID94163693c937899b2117188bf660eea9
- itemNum
- 14
- initialLetter
- F
- itemType
- SR
- itemAnswerKey
- 2
- itemMaxScorePoints
- 1
- origNum
- x
Use the information below to answer the following question.
A student conducts an experiment at home to test the effect of different covers on the melting rate of ice. The student places identical ice cubes on separate trays of known mass. The student covers each tray as shown below.
The trays are placed on the same table. After ten minutes, the student removes the covers, discards the excess water, and calculates the mass of each ice cube.
Which of these is the control in the experiment?
- mass of the trays
- tray with no covering
- mass of the ice cubes
- tray with the plastic covering