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.
Functions of Plant Parts. The Root. The root is the part of the plant that takes in water and minerals for the plant. Roots have root hairs that increase the surface area for more water absorption. The Stem. The stem has vessels that transport sap and water throughout the plant. Sap is a nutrient-rich fluid that contains a lot of sugar. The Leaf. Two Functions of the Leaf Photosynthesis is the process when leaf cells containing chlorophyll take in carbon dioxide and water and using sunlight, make sugar and oxygen. Transpiration is the loss of water from the leaf.