Answer :

you can make an transpiration measuring device known as potometer 
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poojan
Bio plastic or Eco friendly Plastic
Plastic with milk is the best model which is biodegradable in earth and which need is more on now a days
Procedure: 
1.Take some milk in a beaker and add some vinegar to it
2. Make sure that we can see the clumps in milk
3. Now take a cloth and place those clumps in it and press it by covering such that the watery part will goes out
4. Now keep those clumps under the sun and after getting dry they act as plastic

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