Disease, competition, and predation are examples of

Answer: Density-dependent factors that intensify as population density increases Their effect strengthens as crowding increases — important regulators of population size near K.

Floods, fires, and extreme weather are

Answer: Density-independent — affect populations regardless of density A flood kills the same fraction whether the population is sparse or crowded.

The carrying capacity (K) of a habitat for a population can change due to

Answer: Resource availability, climate, predator presence — K is dynamic K depends on environmental conditions. Drought, predator invasion, or habitat improvement can shift K.

AP Biology · Topic 8.4

Effect of Density on Populations Practice

Part of Ecology.(SYI-2.C)

Practice questions

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Sample questions

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Sample 1difficulty 2/5
$Disease, competition, and predation are examples of$
- A
  $Density-independent factors that affect populations regardless of how crowded they become$
- B
  $Stochastic environmental events that strike populations randomly without regard to density$
- C
  $Abiotic stressors that act uniformly on every individual independent of population size$
- D
  $Density-dependent factors that intensify as population density increases$
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Why
$Their effect strengthens as crowding increases — important regulators of population size near K.$
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Sample 2difficulty 2/5
$Floods, fires, and extreme weather are$
- A
  $Always biotic — driven by interactions between organisms in the community$
- B
  $Density-dependent — affect populations more strongly as density increases$
- C
  $Density-independent — affect populations regardless of density$
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- D
  $Always density-dependent — intensify as population density rises$
Why
$A flood kills the same fraction whether the population is sparse or crowded.$
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Sample 3difficulty 3/5
$The carrying capacity (K) of a habitat for a population can change due to$
- A
  $Only genetic factors of the population — K is set by the species genome$
- B
  $Only the time of year and day length — K varies with photoperiod alone$
- C
  $Nothing observable in the environment — K is a fixed intrinsic constant$
- D
  $Resource availability, climate, predator presence — K is dynamic$
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Why
$K depends on environmental conditions. Drought, predator invasion, or habitat improvement can shift K.$
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Sample 4difficulty 3/5
$A volcanic eruption wipes out 90% of a population. This is an example of$
- A
  $Density-independent population reduction$
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- B
  $K-selected reproductive strategy$
- C
  $Density-dependent population reduction$
- D
  $Logistic growth toward carrying capacity$
Why
$Catastrophes affect organisms regardless of density.$
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