I have no clue how to do this...

For a science fair experiment, you decide to testa cartain type of plant to see how well it can grow when it is kept out of sunlight. For two weeks, the plant leaces stay greean then they begin to look yellow. Use the terms photosynthesis, sunshine, energy, stored food, and sugar to describ what is happening to the plant.

what caused the little puddle of water to appear under the syringe tip?