Organisms and Population
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which term describes the maximum number of individuals a habitat can support?

Population density
Carrying capacity
Growth rate
Natality
2

Carrying capacity (K) is the maximum population size that an environment can support indefinitely without resource depletion.

Which equation represents exponential population growth?

dN/dt = rN
dN/dt = K – N
Nt = N0 + K
N = rK
1

The equation dN/dt = rN represents exponential growth, where population increases rapidly without resource limitations.

Which parameter is used to measure the reproductive fitness of a population?

Carrying capacity
Natality rate
Intrinsic rate of natural increase (r)
Sex ratio
3

The intrinsic rate of natural increase (r) measures how fast a population can grow under ideal conditions.

Which of the following is a correct statement about parasitism?

Parasites always kill their host immediately.
Parasitism benefits one species while harming the other.
Parasites obtain energy without harming the host.
Parasitism is a form of mutualism.
2

Parasitism benefits the parasite while harming the host, often weakening but not immediately killing it.

Which of the following statements about biotic and abiotic factors is incorrect?

Abiotic factors include sunlight, water, and temperature.
Biotic factors include all living organisms in an ecosystem.
Abiotic factors do not influence population growth.
Both biotic and abiotic factors shape ecosystems.
3

Abiotic factors, such as climate and resource availability, strongly influence population growth and distribution.

Which of the following statements about ecological succession is correct?

Primary succession occurs in areas with existing soil.
Secondary succession happens after disturbances like wildfires.
Pioneer species appear at the climax stage.
Ecological succession never leads to a stable community.
2

Secondary succession occurs in areas where a disturbance has removed vegetation but left the soil intact.

Which of the following is an incorrect statement about r-selected species?

They produce many offspring with minimal parental care.
They tend to have a short lifespan.
They exhibit slow growth and delayed reproduction.
They often thrive in unpredictable environments.
3

r-selected species reproduce quickly, grow rapidly, and do not exhibit delayed reproduction.

Which of the following is an example of resource partitioning?

Lion and tiger hunting the same prey in the same area
Different species of warblers feeding on different parts of the same tree
Two species of finches competing for the same food
Cuckoo laying eggs in a crow's nest
2

Resource partitioning occurs when species use different parts of a resource to reduce competition, such as warblers feeding on different tree zones.

Which of the following equations represents logistic growth?

dN/dt = rN
dN/dt = rN (K-N)/K
Nt = N0 e^rt
N = K+r
2

The logistic growth equation accounts for limited resources, with growth slowing as population nears carrying capacity (K).

Which of the following statements about mutualism is FALSE?

Both species benefit in mutualism.
Mycorrhizae help plants absorb nutrients while receiving carbohydrates.
Predation is a form of mutualism.
Fig trees and wasps show a highly specific mutualistic relationship.
3

Predation is not mutualism because it benefits only one species while harming the other.

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