| Home | About | Contact | Site Map | Links | Library |
Unique Home Furniture, Home Decorating and Home Decoration Store
Black -root:
Root System.—The root system of a tree functions as an anchoring and absorbing complex. In some species (shortleaf pine) the root system comprises a large, vertically oriented unit with lateral members. This arrangement is termed a taproot. Alternatively, species such as yellow birch and sugar maple are characterized by diffusely spreading root systems, shallowly disposed, and with no single main root. The internal structure of large roots is similar to that of the bole.Each root is a naked organ, incapable of bearing leaves, which has a blunt apex shielded by a rootcap more or less distinct, of old and firm cells. The growing cells of the root lie directly behind this cap, and still farther back is a zone of delicate tubular, one-celled root hairs, which are devoted to the absorption of liquid foods from the soil and are constantly dying off and being renewed on the side next the rootcap.
Absorption of water and essential mineral elements occurs in the remote (distal) portions of the root systems of trees. These terminal regions are embryonic zones composed of actively dividing and maturing cells with each apex protected by a root cap. Root hairs, which are probably the main absorptive sites, likewise commonly occur in the apical regions. Subsequent to entry into the root, the water and soil minerals are moved upward through the conducting tissues of root and stem into the leaves. Flower.—Trees, like herbaceous plants, produce flowers. As a consequence of several factors, however, such as remoteness from the observer due to the size of trees, unfamiliar form and perhaps color, and relatively short life, the flowers of trees are less familiar structures.
.
