In an experiment students placed a dialysis bag containing 100 ml of a starch water mixture in a beaker of water as shown below they left the set up until class the next day when they remove the dialysis bag and measure the volume of the contents they found that there were now 125 ml of the starch water mixture

This question is incomplete. The rest of the question is listed below:

To measure the volume of the starch-water mixture in the dialysis bag, the students should have used a (1) meterstick (3) graduated cylinder (2) triple-beam balance (4) test tube

The answer is 3) graduated cylinder. A measuring stick to measure depth would not have worked as the overall volume of the beaker containing the dialysis bag would not have changed. A test tube would generally have insufficient volume to measure the volume of the dialysis bag and a test tube is generally not graduated. A triple beam balance is generally used to weigh mass and not volume.