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Science Topics, Projects or Science Experiments: Grades 5 & 6

Populations Distribution and Human Pollution

Populations Biotic Potential | Biology | Ecology
This video on Population initially looks at how population growth rates are calculated and introduces the concepts of biotic potential, exponential growth and environmental resistance before looking at boom-and-bust cycles and the carrying capacity of ecosystems. Density independent limits to population growth such as changes in the weather, as well as density dependent limits such as predation, parasitism, and competition are then examined. A discussion of the distribution of populations over space and time concludes the program. Populations Distribution | Biology | Ecology Human Pollution | Biology | Ecology
This video on the Human Impact on the Biosphere introduces the concept of biological magnification before looking at the various types of air pollution and their relationship to phenomena such as smog, acid rain, destruction of the ozone layer and global warming. The program then examines the pollution of water by biodegradable and non-biodegradable pollutants, pathogens, drugs and thermal pollution sources. Deforestation, desertification and other habitat destruction is then addressed along with the impact of such destruction on threatened and endangered species. Human Water Pollution | Biology | Ecology