A nail is driven into the trunk of a tree at a point 1 m above the ground. After 2 years the nail will:

Correct answer: (a) Remain at same position

Explanation

A tree grows in height only at its tips, through the apical meristem. The part of the trunk where the nail was driven in does not grow upward.

So the nail stays at the same height (the trunk only grows thicker around it).