A student decides to test the effect of the watering on plants she chooses 6 tomatoes plants and places all of them in the same part of the garden with plenty of space between them they get the same amount of sunlight and the same amount of fertilizer each day she gives each plant a different amount of water with the first plant getting no water and the others getting 200ml 400ml 600ml 800ml 1000ml she records the total height of the plants each day for 3 weeks what is the independent variable in this experiment
