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Exam 30: Ecology of Populations

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Question 31

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Jacob is studying a population of wrens in Michigan. Over several years, he notices that the population always stabilizes at around 45 individuals. Forty-five individuals is

A) the density.
B) the growth rate.
C) a density-dependent factor.
D) a density-independent factor.
E) the carrying capacity.

F) D) and E)
G) B) and E)

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Question 32

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Which of the following represents a type I survivorship curve?

A) Spiders produce egg sacs with thousands of offspring, but only a few survive to adulthood.
B) Each spring an oak tree drops thousands of seeds, but only a few will ever reach sexual maturity.
C) Daphnia are planktonic crustaceans that produce offspring every three weeks. One Daphnia produces eight young and after 1.5 weeks, four of these individuals are still alive.
D) Bald eagles return to the same mates and nests each year. They typically have two to three eggs and with parental care provided by both parents, the survival rate of the chicks is high.
E) As adults, female leatherback sea turtles return to the beaches where they hatched to lay their own brood.

F) A) and B)
G) C) and D)

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Question 33

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Which of the following is true about the majority of less-developed countries LDCs) ?

Which of the following represents replacement reproduction?

Above is a life history table for a minnow small fish) . Based on this table, what type of survivorship curve do these animals have?

Jacob is studying a population of wrens in Michigan. Over several years, he notices that the population always stabilizes at around 45 individuals. What is the reason for this?

All of the following are true about human population growth except

Which field of biology studies all aspects of biodiversity?

During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. When the butterflies first arrived on the island, they did not have to compete for access to food or space. In addition, there were few natural predators such as wasps and birds which were common on the mainland. As a result, the island population will have a _____ biotic potential compared to the mainland population.

If a population of 200 squirrels has a 10 percent growth rate each year, how many individuals will be born in the next year?

During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. After several years, the population stabilized with approximately 150 individuals. The butterflies and the flowers that they require for food would be considered an example of an)

Exponential growth

Organisms are more likely to face extinction if they have which of the following characteristics?

See Figure 30.4. Many countries in Europe have negative growth because of very low birthrates. Blooms Level: 1. Remember Learning Outcome: 30.02.02 Distinguish between more-developed countries MDCs) and less-developed countries LDCs) with regard to population growth. Section: 30.02 Topic: Human Population Growth -Which of the following is true about the current state of human population growth?

When a population reaches the stable equilibrium phase, this is considered

Which of the following is not characteristic of opportunistic populations?

Equilibrium populations tend to exhibit a type III survivorship curve.