Effective teachers contribute to the development of classrooms and schools that value diversity and civic-mindedness. Effective teachers collaborate with other teachers, administrators, parents, and education professionals to ensure students' success, particularly the success of students with special needs and those at high risk of failure.
A cuticle /ËkjuËtÉªkÉl/ , or cuticula, is a term used for any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of cuticle are non-homologous, differing in their origin, structure, function, and chemical composition.he cuticles of plants function as permeability barriers for water and water-soluble materials. The cuticle both prevents plant surfaces from becoming wet and helps to prevent plants from drying out. Xerophytic plants such as cactus have very thick cuticles to help them survive in their arid climates.
If a plant is going to live on dry land, it must be able to prevent this dessication. Cuticle is the answer. Cuticle is a waxy covering that can be found on essentially all exposed surfaces: leaves, stems, flowers, fruits but not roots. This waxy surface inhibits the loss of water. As stems grow, corky bark tissue replaces cuticle in function. Why do roots not have a cuticle coating? Cuticle controls water loss. However, this causes another problem: gas exchange. All plants require CO2 for photosynthesis. In an aquatic environment with no cuticle, diffusion works fairly well for exchange of these gases (so long as the tissues are not too thick and dense).