Biology-part 6

Imagine that two songbird species, one an r-strategist and the other a K-strategist, are driven almost to extinction. Intense conservation efforts are undertaken, and both species begin to recover and increase in number. Which, if either, species should increase in number more quickly, and why?

• Both species should recover equally, since every species has an intrinsic rate of increase.

• The r-strategist species should increase in number more quickly because it has density-independent mortality rates

• The r-strategist species should increase in number more quickly because it matures more quickly to reproductive age

• The K-strategist species should increase in number more quickly because it has iteroparous reproduction

Which of the following is most consistent with a species with an r life-history strategy?

• High level of parental care

• Large body size

• Type 3 curve

• type 1 curve

If the age structure of a country's population is balanced, what prediction can be made about the near future?

• The population will not increase rapidly

• The death rate will decline

• The demographic transition will begin

• The birth rate will decline

Why is a random dispersal pattern the rarest in nature?

• Only aquatic resources are randomly dispersed.

• Resources in nature are rarely randomly spaced.

• Resources such as most fertile soil are common and abundant.

• None of these choices are correct.

Which of the following statements about populations that follow logistic growth patterns is true?

• When population sizes are small, their patterns of growth are similar to their exponential growth

• Their rate of growth is fastest when they are near their carrying capacity

• They are not subject to density-dependent factor

• All of the above

An r-strategist species typically does not

• produce large numbers of offspring

• provide parental care

• have semelparous reproduction

• tolerate a wide range of resource conditions

The patterns and processes of changes in populations are called population

• Structure

• Demography

• Density

• dispersion

When white pine seeds are blown by wind into an open field, young pine trees grow wherever the seeds land. As the pine trees get larger, they begin crowding each other and competing for space and light. Most of the pine trees die, and those pine trees that continue to live are each located at a distance from their nearest pine neighbors. Which of the following statements concerning the distribution pattern of a white pine population over time is true?

• The trees will be clumped at all ages

• The trees will be randomly spaced when young and clumped when older

• The trees will be clumped when young and randomly spaced when older

• The trees will be randomly spaced when young and uniformly spaced when older

Individuals of a population that are all born at the same time are known as a

• Survivorship

• Cohort

• Deme

• population

African elephants take many years to reach sexual maturity. A female usually gives birth to one calf at a time, and cares for the calf for several years. The most likely survivorship curve for an African elephant population is

• type 1

• type 2

• type 3

• logistic