Types of eye twitching. Minor eyelid twitch also can be caused by irritation of the surface of the eye ( cornea) or the membranes lining the eyelids (conjunctiva). Sometimes the cause of minor eyelid twitch cannot be identified. In almost all cases it is painless and harmless.
Roots are not simply smooth, long structures. In fact, they typically have tiny hairs that cover most of the roots' length. These hairs absorb water and soluble nutrients for plant success. However, some critical nutrients, like phosphorus, are not readily absorbed by plant root hairs. Soil micro-organisms, such as earthworms, consume the surrounding elements and expel castings rich in soluble elements.
Roots in Angiospermic Plants: Function, Modification and Anatomy. Root is the underground (positive geotropic), non-green part of the plant which develops from radical and grows vertically down into the soil. Root lacks leaves, nodes, internodes and buds. Root and its branches constitute the root system. In nearly all dicots, the primary root is a direct elongation of the radicle. It remains distinct and bears lateral roots of several orders throughout the life of the plant. The primary root along with its branches is termed as the Tap root system.