Bio - Exam 1

1000

A population is growing exponentially and its instantaneous growth rate (r) is 0.02. Would the number of individuals added to the population (rN) be greatest at a population size (N) of 20, 500 or 1000? See Section 51.3 (Page)

alteration or destruction of the physical habitat

According to most conservation biologists, the single greatest threat to global biodiversity is _____.

The South Pole would get colder

If the Earth were to reorient such that the North Pole always received direct sunlight (always faced the Sun), how would that change Earth's climate?

focusing on keeping adult alive

In species like sea turtles with high juvenile mortality, low adult mortality, and low fecundity, conservationists can most effectively help them by _____. See Section 51.6 (Page) .

habitat destruction

The main factor that leads to the loss of biodiversity is _____.

Remove all equatorial moisture and convection.

Theoretically, which would be the most effective way to disrupt a Hadley cell?

attempts to maximize the fitness of the individual

Ultimately, behaviors that influence the choice of mates are driven by ______. See Section 50.3 (Page) .

Water selectively reflects and absorbs certain wavelengths of light.

Which of the following can be said about light in aquatic environments?

The average climate and pattern of climate are important in determining biome distribution

Which of the following statements best describes the effect of climate on biome distribution?

innate behaviors

Fixed action patterns are examples of _____. See Section 50.1 (Page) .

broad-leaved evergreen trees

What is the main type of vegetation in a tropical wet forest?

The isolated plots are more vulnerable to edge effects.

A land developer and several ecologists are discussing how a parcel of private land should be developed while saving 20 hectares as natural habitat. The land developer suggests that the 20 hectares be divided into twenty separate 1-hectare areas. The ecologists suggest that it would be better to have one intact parcel of 20 hectares. What is the significance of these different arrangements of the 20 hectares?

Population size will continue to increase as long as the average fertility is above the replacement rate.

How can human population size keep increasing in spite of decreased fertility rates? See Section 51.5 (Page) .

The detector will incur less cost and gain an advantage over others unable to detect the deceit.

How does natural selection favor an individual that can detect deceitful communicators? See Section 50.5 (Page) .

it is the source of chemical energy used by a species throughout a food web

Net primary productivity is important because ________.

immigration

Populations grow due to births and _____. See Section 51.2 (Page)

biodiversity hot spots

Relatively small geographic areas with high concentrations of endemic species and a large number of endangered and threatened species are known as _____.

The interaction of food availability and predation intensity

What best explains hare and lynx population cycles? See Section 51.4 (Page) .

Br > C, meaning altruism occurs when its benefit to a relative times r, the coefficient of relatedness between the relative and the actor, outweighs the costs to the actor

What is Hamilton's rule? See Section 50.6 (Page) .

Protect an entire area from exploitation or habitat degradation

What is the most effective way to preserve species diversity?

An increase in estrogen or testosterone

What would be a proximate cause for increased sex drive in human teens? See Section 50.1 (Page) .

This is because in developing countries, survivorship and the fertility rate have been increasing.

Why does the age structure of human populations differ in developed versus developing nations? See Section 51.5 (Page) .