______ is found at the centre of a tree trunk.

Two trees have perfectly straight trunks and are both growing perpendicular to the flat horizontal ground beneath them. The sides of the trunks that face each other are separated by 1.3 m. A squirrel makes three jumps in rapid succession. First, he leaps from the foot of one tree to a spot that is 1.0 m above the ground on the other tree.Then he jumps back to first tree, landing on it at a spot that is 1.7m above the ground Finally, he leaps back to the other tree, now landing at a spot that is 2.5 m above the ground. What is the magnitude of the squirrel's displacement?

Which of the following provide maximum mechanical strength to a tree trunk .

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level . After 3 years the nail will

If you cut the old trunk of a tree transversely, you will observe that the outer region of secondary wood is lighter in colour. This region of wood is known as