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Exam 4: Populations and Communities

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Question 1

Multiple Choice

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Which one of the following is a trait that increases the chances of survival for an endangered species?

A) large size
B) a food source consisting of a single species
C) widespread distribution
D) small number of offspring

Correct Answer

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C

Question 2

Multiple Choice

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A stable population would remain at equilibrium if

A) the birth rate increased as the death rate decreased.
B) emigration rates and death rates increased equally.
C) births and immigration increased by the same number of organisms.
D) births and deaths increased by the same number of organisms.

Correct Answer

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D

Question 3

Multiple Choice

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Introduced alien species that cause the most harm are those that

Kudzu vine,chestnut blight,fire ants,and Japanese beetles are all examples of

Adaptation takes place in response to

The relationships among elk predators represent

In an ecosystem with many similar species,we typically find

Which of the following organisms is most likely a K-strategist?

Which of the following represents a type of top-down regulation for wildflowers living in a forest?

Controlling the Spotted Knapweed reveals

The different Galápagos finch species

Walking through a national park,you step off a well-marked trail to take a photograph and accidentally trample a rare orchid.This is an example of

It is common to hear about the huge reproductive potential of some organisms.Perhaps someone has mentioned that if all of the eggs of houseflies were to survive to maturity,the world would soon be covered in flies.This does not happen because,in reality,

Rabbits in Australia

Dung beetles live in regions where cattle graze,quickly burying and recycling cattle droppings.Because of the dung beetle's activities,breeding habitats and resources for disease-carrying flies are reduced and the plants upon which cattle feed are nourished. -The relationship between the dung beetles and the disease-carrying flies is a type of

Brown-headed Cowbirds lay their eggs in other birds' nests,relying upon another species to raise their chicks.Although many species continue to raise the cowbird chicks,some species reject the eggs and offspring.Further,Brown-headed Cowbirds are rare inside large forests.Which of the following represents an adaptation in response to this cowbird threat?

A population of catfish in a muddy pond reaches its maximum size as the food supplies start to run low.Without any new sources of food,the catfish population remains steady.This population represents

Which of the following represents a type of top-down regulation for rattlesnakes living in Arizona?

In North America,a toxic weed called leafy spurge was accidentally introduced and has grown and spread rapidly,covering millions of acres in north central United States and south central Canada.Leafy spurge is generally avoided by cattle and horses and may be toxic to them.Thus,rangeland where leafy spurge has spread has been damaged by the invasion of this plant. -Plants such as leafy spurge can double their population size every year in part because of their efficient production of large amounts of seeds.Populations that can double every year,such as leafy spurge,

New genetic traits upon which natural selection can act usually arise from