Question

if you penetrate a nail in tree what will happen to it after 1 year tell

Answer 1

Hammering a nail into a tree does create a wound, but if the tree is healthy, no serious harm will be done. Stainless steel or galvanized nails or screws that won't rust are the safest for trees. 

Wounds in trees don't heal like a wound to your body. The tree seals off the wound instead of regenerating the cells, and new growth appears around the damage. 

The height on the tree where you hammer the nail is where it will stay, it does not rise with the growth of the tree. the tree's diameter increases, eventually engulfing the nail.

Hope it helps u