| If children have grown their own seedlings, some could be used for this activity.
At this stage it is not necessary to complicate the water/no water comparison by considering other factors. Simply ensure the watered and non-watered plants are left in the same place.
At this stage it is helpful to children to treat the two factors, water and light, separately. Grown cress from the supermarket can be used for this activity. A tray can be cut in half and one half kept in the light and the other in the dark. Results can be seen within a week.
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