In higher vertebrates the two roots unite…
Better soil, roots, and plant nutrition create a picture of lawn health – both above and below ground!
Roots can tell whether nearby roots are self or other and, if other, kin or stranger.
Generally, all swamp trees lack deep-growing roots.
A number of other specialized roots exist among vascular plants.
Abnormal root growth is revealed by comparison with healthy roots.
Spinal nerves are sensorimotor nerves with dorsal and ventral roots.
When the soil is saturated with water, oxygen is unavailable to plant roots.
Grasses (Poaceae) and many other monocotyledons produce fibrous root systems with the development of adventitious roots.
These secondary roots further produce their own smaller lateral roots (tertiary roots).
Some roots, called adventitious roots, arise from an organ other than the root—usually a stem, sometimes a leaf.
In lower fishes there is still alternation of dorsal and ventral roots, but the roots unite in a single spinal nerve.
Adventitious roots, when modified for aerial support, are called prop roots, as in corn or some figs (Ficus; Moraceae).
The result is several large, positively geotropic roots that produce higher-order roots, which may also grow to the same size.
Nematodes are attracted to host roots by sensing either the heat given off by roots or the chemicals secreted by roots.
Most roots penetrate the ground, but, in some palms, adventitious roots may form a mound above ground or appear at intervals along the stem.
This network of roots does not arise as branches of the primary root but consists of many branching roots that emerge from the base of the stem.
In roots, the first cork cambium appears in the outermost layer of the vascular tissue system, called the pericycle (see below Plant organs: Roots).
In plants in which the taproot persists, smaller lateral roots (secondary roots) commonly arise from the taproot and may in turn produce even smaller lateral roots (tertiary roots).
Respiratory or knee roots (pneumatophores) are characteristic of many species; they project above the mud and have small openings (lenticels) through which air enters, passing through the soft spongy tissue to the roots beneath the mud.
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