What You Need:
- Plastic or glass cup
- Small carrot
- Plastic straw
- Toothpicks - 4
- Scoop the leafy top out of the end of the carrot and make a small hollow.
- Cut 5cms off the end of the plastic straw and insert it into the hollowed out end of the carrot.
- Light the candle and use the melted wax to seal the piece of straw onto the carrot. Ask an adult to help you with this step.
- Push the 4 toothpicks into the top of the carrot.
- Fill the cup with water right up to the rim.
- Suspend the carrot in water with the toothpicks resting on the rim of the cup.
- Leave it in a place where it does not get disturbed for a day or two.
Osmotic pressure would have pushed water up into the straw. Osmotic pressure is a kind of pump that helps water move across cell walls. When the carrot grows in the ground, its cells transfer the water in the ground up to the stalks and leaves above the ground by a process called osmosis.