The S-shaped logistic growth curve plateaus at the population's

Answer: Carrying capacity (K) Logistic: dN/dt = rN(K-N)/K. As N approaches K, growth slows to zero.

What does the lag phase represent biologically?

Answer: Cells are synthesizing enzymes and adjusting to the new medium before rapid division. During lag, cells acclimate, synthesize ribosomes/enzymes, and prepare to divide. The population doesn't yet grow exponentially.

The age-structure pyramid shown best predicts what for the population?

Answer: Rapid future growth (expanding population) A broad base with each younger cohort larger than the next indicates a high reproductive potential and predicts rapid expansion.

AP Biology · Topic 8.3

Population Ecology Practice

Part of Ecology.(SYI-2.B)

Practice questions

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Sample questions

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Sample 1difficulty 2/5
$The S-shaped logistic growth curve plateaus at the population's$
- A
  $Carrying capacity (K)$
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- B
  $Initial size (N0)$
- C
  $Intrinsic growth rate (r)$
- D
  $Per capita death rate (d)$
Why
$Logistic: dN/dt = rN(K-N)/K. As N approaches K, growth slows to zero.$
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Sample 2difficulty 2/5
$A bacterial culture was sampled hourly for 8 hours after inoculation in fresh media. Cell density was plotted on a semi-log scale.$
$What does the lag phase represent biologically?$
- A
  $Cells are synthesizing enzymes and adjusting to the new medium before rapid division.$
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- B
  $DNA replication is inhibited.$
- C
  $The population has reached carrying capacity.$
- D
  $Cells are dying due to nutrient deprivation.$
Why
$During lag, cells acclimate, synthesize ribosomes/enzymes, and prepare to divide. The population doesn't yet grow exponentially.$
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Sample 3difficulty 2/5
$The age-structure pyramid shown best predicts what for the population?$
- A
  $Stable or declining population$
- B
  $Negative growth in 50 years$
- C
  $Rapid future growth (expanding population)$
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- D
  $Equal growth and death rates$
Why
$A broad base with each younger cohort larger than the next indicates a high reproductive potential and predicts rapid expansion.$
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Sample 4difficulty 2/5
$At which population size does the logistic growth curve show the maximum dN/dt?$
- A
  $N = K$
- B
  $N just below K$
- C
  $N = K/2$
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- D
  $N = 0$
Why
$In the logistic model dN/dt = rN(1 - N/K), the maximum growth rate occurs at N = K/2, the inflection point of the S-curve.$
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Sample 5difficulty 2/5
$Researchers captured 100 fish in a lake, marked them, and released them. One week later they captured 80 fish, of which 20 were marked.$
$Using N = (M x C)/R, what is the estimated population size?$
- A
  $400 fish$
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- B
  $1600 fish$
- C
  $100 fish$
- D
  $200 fish$
Why
$N = (100 x 80)/20 = 8000/20 = 400 fish.$
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