Old Tree

Trees exist in two different groups of vascular or higher plants, the gymnosperms and the angiosperms[clarification needed]. Both groups are seed... more

by Johnson Moya

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4961.000 x 3294.000 pixels

Title

Old Tree

Artist

Johnson Moya

Medium

Photograph

Description

Trees exist in two different groups of vascular or higher plants, the gymnosperms and the angiosperms[clarification needed]. Both groups are seed plants. The gymnosperm trees include conifers, cycads, ginkgophytes and gnetales. Angiosperm trees are also known as broad-leaved trees. Most angiosperm trees are eudicots, the "true dicotyledons", so named because the seeds contain two cotyledons or seed leaves. A relatively smaller number of other angiosperm trees are paleodicots; these include Amborella, Magnolia, nutmeg, avocado, and others.

Wood gives structural strength to a tree stem which is used to support the plant as it grows larger. The vascular system of trees allows water, nutrients and other chemicals to be distributed around the plant, and without it trees would not be able to grow as large as they do. The three main parts of trees include the root, stem, and leaves; they are integral parts of the vascular system which interconnects all the living cells. In trees and other plants that develop wood, the vascular cambium allows the expansion of vascular tissue that produces woody growth. Because this growth ruptures the epidermis of the stem, woody plants also have a cork cambium that develops among the phloem. The cork cambium gives rise to thickened cork cells to protect the surface of the plant and reduce water loss. Both the production of wood and the production of cork are forms of secondary growth.

Uploaded

November 9th, 2013