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.
b. soil: provides water and dissolved minerals. 3. Roots and shoots depend on each other for survival: a. roots depend on shoots for sugar and other organic nutrients. b. shoots depend on roots for water, minerals and support. 4. Vascular tissues (xylem and phloem) transport materials throughout the plant. a. xylem: water and minerals from roots to shoots. b. phloem: food from shoots to roots and other nonphotosynthetic parts and from storage roots (carrots, potatoes, etc.) to actively growing shoots.