Most living organisms, including plants and animals, are made up of water as a major constituent. As far as humans are concerned, they are made of 70% water. But if all of it is released, the weight a human has will decrease considerably. The same theory can be applied to a fruit or vegetable - since they're made of water too. Those primary school students who are looking for ideas on Science projects can try this experiment as it can be performed in quick time and with minimum expense. The final results may take some time to be recorded.
Washing & drying carrots
With all items gathered in one place, wash the carrots with cold water and cut their stems. Put them where they can dry quickly and completely.
Weigh the carrots
After the carrots have dried, put them on a kitchen scale to measure the weight and note down the reading.
The wax paper
Now take a piece of wax paper, weigh it and note down the reading as it will be used later in the experiment.
Re-weigh the carrots
After two days, weigh the carrots again. Make sure you subtract the wax paper's weight from the total.