Suggestions:-

Our team's suggesion for the best tree is :- "PEEPAL" Tree. Its importance is that "IT IS THE ONLY TREE IN WORLD WHICH GIVES OXYGEN AT NIGHT" . But it was not chosen because its position to be planted  depends on Indian Vastu-Shastra. Its scientific name is:-"FICUS RELIGIOSA".
ITS LEAVES CAN BE USED TO GENERATE "ELECTRICITY".

By:- a>v designs the tomorrow.........