First place cotton wool in three petri dishes and soak them with an equal volume of water (control).
Place ten seeds (control type of seed).
Place in a warm place and allow seeds to germinate.
Water seeds every day with the same volume of water.
After a few days the seeds will germinate. Make sure the dishes have the same number of seedlings (control variable) by removing excess seedlings.
Measure the height of the seedlings with a ruler holding the seedling upright to get an accurate measurement.
Place the 3 dishes in different conditions. One in full sunlight, another in partial light, one in darkness.
Measure the height of each seedling everyday for 5 consecutive days and calculate a mean for each day.
Results: The seeds in full and partial light grow to a similar height and both towards the light. The ones in the dark grow higher as they are trying to reach the light. The heave yellow leaves as they can’t carry out photosynthesis in the dark.