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AP Biology 8.3: Population Ecology

Practise AP Biology 8.3 questions by analyzing birth and death rates, population estimates, growth curves and environmental limits.

Syllabus
Effective Fall 2025
Course
AP Biology

Exam points

  • calculate or predict population change from birth rate, death rate and population size
  • interpret growth curves, mark-recapture estimates and population data to describe population dynamics
  • explain how resources, density and environmental conditions affect population growth and survival

Covered syllabus points

8.3.A—Describe factors that influence growth dynamics of populations

8.3 Population Ecology question 1

[Maximum number: 1]

Scientists studying a wild population of mantled howler monkeys found the average birth rate to be 0.22 and the average death rate to be 0.12. At the start of the study, the population consisted of 13 monkeys. Assuming no immigration or emigration, which of the following best describes the change in population size that will occur over the next year?

A

The population size will decrease because a population of 13 is too small to sustain itself.

B

The population will decrease because more monkeys are dying each year than are being born.

C

The population will increase exponentially because it is so small that there are likely few competitors and abundant resources.

D

The population will increase because more monkeys are being born each year than are dying.

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