1) What is biodiversity? a) The number of different species in an ecosystem b) The role or job of an organism in an ecosystem c) The total number of one species in an area 2) An ecosystem will most likely remain healthy and stable if a) it has more predators than prey b) it has a high level of biodiversity c) biotic factors decrease 3) Does this ecosystem have a high level of biodiverity? a) Yes b) no 4) Cutting down a rainforest and planting ONLY coffee plants would most likely result in a) a decrease in biodiversity b) an increase in the amount of energy recycled c) a decrease in erosion 5) A serious threat to biodiversity is a) Competition within a species b) maintenance of food chains c) habitat destruction 6) Put these in the proper order Shrubs, grass, lichen or bacteria, small trees, large trees a) Lichen and bacteria, shrubs, grass, large trees, small trees b) lichen or bacteria, grass, shrubs, small trees, large trees 7) Which two groups of organisms are most likely to be pioneer organisms? a) birds and squirrels b) Lichen and algae c) Deer and black bears 8) Years after the lava from an erupting volcano destroyed an area, lichens started to grow. The lichens were replaces with grass, shrubs and trees, which were finally replaced by deciduous trees. This process is known as... a) Primary succession b) Secondary succession 9) If the grass in the front yard of an abandon house is not cut for several years, the yard may become overgrown with taller grass, shrubs and bushes. This is an example of... a) primary succession b) secondary succession 10) The amount of coral on a reef limits how many fish can live there because the fish depend on it to survive. In this area, the coral is the.. a) Pioneer species b) Limiting factor 11) What term best describes how an environment can support only as many organisms as the available resources will allow a) Biotic factors b) carrying capacity 12) Which line represents the carrying capacity a) Dark purple b) light purple 13) After a rabbit population reaches the carrying capacity of its habitat, what will most likely happen to the population of rabbits? a) Continue to decrease b) Increase than decrease 14) Humans are responsible for some of the negative changes that occur in nature because they a) have passed laws to preserve the environment b) are bale to preserve scarce resources c) are able to modify (change) habitats more than any other species 15) Microbes are tiny, smooth, plastic spheres found in common household products such as facial soap. These beads, measuring from .0004 to 1.24 mm, rough the size of a small fish egg, are too small to be removed by water treatment systems. Thus, they end up in rivers, lakes, and other bodies of water. The accumulation of these microbeads is an environmental concern for aquatic biologists because microbeads.. a) may stick to some household water pipes, preventing drainage problems b) could be mistaken for food by some species, working their way up the food chain 16) Scientists have studies oceanic plastic garbage "patches" around the world. These are areas that accumulate plastic garbage from coastal regions. Their environmental effects ranges from killing sea life to blocking sunlight from reaching photosynthetic organisms. Without change in human plastic usage, new garbage patches will continue to form. Which human activity would most directly REDUCE the amount of plastic garbage that enters the ocean? a) Clean up plastic trash from shorelines, rivers and other waterways that flow into the oceans b) Manufacture more disposable plastic bottles 17) Wild fires can cause massive destruction. But scientists say that fires are actually good for the forests. Scientists are looking at a) primary succession to happen b) secondary succession to happen

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