DENDROLOGY

Detailed explanation-1: -But after a certain height, the force of gravity becomes too much, and this flow peters out. As a result, photosynthesis grinds to a halt and the tree can’t grow higher. At least that was the general idea–experimental data were scarce, and many of the details remained sketchy.

Detailed explanation-2: -All the groups of plants that include trees are vascular plants. This means they have vascular tissues called xylem and phloem. Xylem and phloem link all parts of the plant, transporting water, minerals and manufactured food around while also forming part of the structural support for plants.

Detailed explanation-3: -The vascular system consists of two conducting tissues, xylem and phloem; the former conducts water and the latter the products of photosynthesis. In the stems and roots the vascular tissues are arranged concentrically, on the order of a series of cylinders.