Question 1

An "S" shaped curve is characteristic of logistic population growth.

Accepted Answer

An "S" shaped curve represents logistic population growth, which models how a population grows rapidly at first and then levels off as it approaches the carrying capacity of its environment.

Question 2

Egg yolk and seed endosperm are examples of passive parental care.

Accepted Answer

Both egg yolk in animals and seed endosperm in plants serve as nutrient sources for the developing embryo, representing forms of passive parental care where resources are provided to ensure offspring survival without further action from the parent.

Question 3

Which characteristics are consistent with a K -selected species? Where do humans fall on the r through K continuum?

Accepted Answer

The answer of Which characteristics are consistent with a K...

Question 4

Populations of bay checkerspot butterflies that occupy large patches of suitable habitat serve as sink populations for individuals that recolonize small patches of suitable habitat where butterfly populations frequently become extinct.

Accepted Answer

Populations of bay checkerspot butterflies that occupy large patches of suitable habitat serve as source populations, not sink populations, for individuals that recolonize small patches of suitable habitat. Source populations are healthy, stable populations that can provide individuals to colonize other areas, whereas sink populations rely on immigrants from other areas to maintain their numbers.

Question 5

What basic information does a demographer need to know to predict a species population size through time?

Accepted Answer

The answer of What basic information does a demographer need...

Question 6

A cohort is a group of individuals of the same sex .

Accepted Answer

A cohort refers to a group of individuals who share a common characteristic or experience within a defined period, not necessarily the same sex.

Question 7

Biologists captured and marked 120 butterflies, and later captured 150 of which 30 were marked. The population estimate is 1000 butterflies.

Accepted Answer

The answer of Biologists captured and marked 120 butterflies, and...

Question 8

Parasitism is a density- independent factor of population control.

Accepted Answer

Parasitism is a density-dependent factor because the effect of parasitism on a host population increases as the density of the host population increases.

Question 9

What type of population dispersion is most common, and how does area sampled affect how dispersion appears to a researcher?

Accepted Answer

The answer of What type of population dispersion is most...

Question 10

It took 3 million years for the human population to reach 1 billion, 123 years to grow to 2 billion, and 12 years to grow from 6 to 7 billion.

Accepted Answer

Human population growth has accelerated over time, taking millions of years to reach the first billion around 1804, then significantly less time for each subsequent billion, with the growth from 6 to 7 billion occurring between 1999 and 2011.

Question 11

The tools used by ecologists to study mortality rates were developed by developmental biologists .

Accepted Answer

Ecologists and developmental biologists use different sets of tools tailored to their specific fields of study. Ecologists often use population models and statistical tools to study mortality rates in ecosystems, while developmental biologists focus on the molecular and cellular mechanisms of organism development, using tools like gene editing and microscopy.

Question 12

Logistic population growth describes growth without limitation.

Accepted Answer

Logistic population growth describes growth that eventually slows as the population reaches carrying capacity, indicating limitations due to resources or other factors.

Quiz 52: Population Ecology