Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 400 nm to 100 nm, shorter than that of visible light but longer than X-rays.V radiation is present in sunlight, and is produced by electric arcs and specialized lights such as mercury-vapor lamps, tanning lamps, and black lights. Although lacking the energy to ionize atoms, long-wavelength ultraviolet radiation can cause chemical reactions, and causes many substances to glow or fluoresce.
A terrestrial ecosystem is a type of ecosystem found only on biomes also known as beds. Six primary terrestrial ecosystems exist: tundra, taiga, temperate deciduous forest, tropical rain forest, grassland and desert. A community of organisms and their environment that occurs on the land masses of continents and islands.
Scientists call these major ecosystem types biomes. The geographical distribution (and productivity) of the various biomes is controlled primarily by the climatic variables precipitation and temperature. The map in Figure 9k-1 describes the geographical locations of the eight major biomes of the world.Because of its scale, this map ignores the many community variations that are present within each biome category. Figure 9k-1: Distribution of the Earth's eight major terrestrial biomes.lant communities are usually composed of a few species of dwarf shrubs, a few grass species, sedges, and mosses. Perhaps the most characteristic arctic tundra plants are lichens like Reindeer Moss (. spp.). The principal herbivores in this biome include caribou, musk ox, arctic hare, voles, and lemmings.