16 Jun what has caused the dramatic increase in human population
Question
Only need short answer.
1. what has caused the dramatic increase in human population over the past 200 years?
2. what is the growth rate of a population where the number of births per 1000 population is 10.8, the number of death per 1000 population is 7.2, and the migration rate per 1000 is – 2.4?
3. what is the actual growth rate of a population of 900 individuals in an environment where the carrying capacity is 100 and the intrinsic growth rate is 1.4?
4. how do immigration and emigration change the overall growth rate of a population?
5. draw a graph of population growth that is restricted by an environmental limit over time. Label the horizontal axis ‘Time’ and the vertical axis ‘Population size’. Begin the graph with a very small population size, and label the segments where exponential growth is occurring and where the population has stabilized at carrying capacity.
6. what causes a decline in the growth rate of populations that are approaching the carrying capacity of the environment?
7. describe why increasing the nutrient level in lakes can lead to fish kills.
8. describe some environmental conditions where lake eutrophication is more likely to occur.
9. persistent toxic chemicals are found in highest concentrations in organisms at the highest trophic levels. Explain why this is the case.
10. which chemical do you think is more likely to affect a large number of individuals as a result of biomagnification, and why?
a. Oxymyl, an extremely poisonous pesticide used to kill insects, which is water soluble and degrades within days or weeks in soil and water.
b. Polychlorinated biphenyls (PSBs), a group of chemical that are extremely stable ( do not break down under most conditions), fat-solute, non toxic in low doses, and were previously used widely in human construction as a fire retardant.
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