BIO 182 Exam 1 Chapters 45, 43, 44, 46, 47 Review Questions with Answers

At what levels of life are focused on while studying ecology?-organismal -population -community -ecosystem What is the difference between a biotic and abiotic factor in the environment?-Biotic interactions are interactions among living things -Abiotic interactions are between organisms and their nonliving environment There are two major classes of aquatic biomes that are divided based on their salt content. What are they?freshwater biome -salt concentration of less than 1% -lakes, streams, rivers, and wetlands marine biome -a salt concentration around 3% -oceans, intertidal zones, coral reefs, and estuaries. What % of earth does fresh water cover?less than 1% Be able to understand and explain the benthic realm, photic zone, and aphotic zone as is occurs in lakes and ponds.photic zone -light is available for photosynthesis -shallow water near shore and the upper layer of water away from shore. aphotic zone -deeper and has light levels too low to support photosynthesis. benthic realm -at the bottom of all aquatic biomes Unlike lakes and ponds which are standing water, rivers and streams are flowing water. Be able to explain some of the differences in properties that occur near the source of the stream vs. downstream.Near the source of a stream, the water is usually -clear, cold, swift, and low in nutrients.