Question

Explain why a mark on a blade of grass will move away from the ground as the grass blade grows, but a similar mark on a tree trunk will not move away from the ground.

Answer 1

The first is correct a tree goes up to an extent then grows outwards whereas grass grows up

Answer 2

I believe it is due the fact that when grass grows it grows from the ground up.
However a tree grows from the top and keeps going upwards.