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10/18/2010
1.
Petunia, a commonly cultivated plant with brightly colored flowers, exhibits an annual
life history in temperature climates, i.e., the plant grows, produces flowers, sets seed and
dies at the end of the year.
If you are starting a nursery with 10 Petunia plants, how long
will it take for the nursery to produce more than 60 plants given a birth rate of 2 plants
per year and no seed mortality from one year to the next?
Assume that the bank has
agreed to loan you enough money to buy soil, fertilizer and an assistant to hand pollinate
every single plant in the nursery.
(a) Never, because the population dies out
(b) 2 years
(c) 2.5 years
(d) 3 years
(e) 3.2 years
2.
The graph below illustrates the population dynamics of a captive beetle population, based
on data collected every week for a period of three years.
Based on the dynamics you see
in the graph, which of the following models would be the most appropriate for predicting
future population sizes?
(a) Geometric
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 Spring '05
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