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Celery and Food Colouring Science Experiment for Kids

Have you ever wondered how exactly water gets absorbed into plants after you have watered them? Unlike us humans, plants make their own food through the process of photosynthesis. “Photosynthesis is a process used by plants and other organisms to convert light energy, into chemical energy that can be later released to fuel the organisms’ activities.” But to begin this incredible process, plants require water, air, nutrients and energy (normally from the sun).  All of which are essential for plans to grow and live. With this simple celery and food colouring experiment and adult supervision, you will see how water gets absorbed from the soil and travels throughout the plant.


  • Clear, tall jar or drinking glass
  • Food colouring (your favourite colour)
  • Water
  • Fresh tall celery stalk with leaves (trim the bottom)
  • Scissors


  • Fill jar or glass half-full with tap water
  • Add few drops of food colouring to the water and mix
  • Place celery stalk in your container with the coloured water and leave it overnight in a safe spot.


Remove from water and carefully observe the celery stalk the next day. Both stem and leaves should have a tint of the colour you used. The manner in which the food colouring traveled to all parts of your celery stalk and leaves is the same way water is absorbed from the soil and travels throughout plants when they are watered.


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