Unit 3: Populations
Env. Science · Unit 3 · Paper 3

Populations unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 17 terms and is the same for everyone, so a teacher can assign “Unit 3, Paper 3” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 37 min 34 points0/17 attempted
1

K-selected species

2

IPAT equation

3

Age structure diagram

4

Factors that lower birth rates

5

Generalist vs specialist species

6

Crude birth and death rates

7

r-selected species

8

Rule of 70

9

Population growth rate calculation

10

Infant mortality rate

11

Survivorship curves

12

Calculating percent growth rate

Short answer 1. Define or explain: Replacement level fertility

3 pts

Short answer 2. Define or explain: Population momentum

3 pts

Short answer 3. Define or explain: Total fertility rate

3 pts

Short answer 4. Define or explain: Carrying capacity

3 pts

Free response

10 pts

Country Z has a population of 40 million, a crude birth rate of 34 per 1,000, a crude death rate of 9 per 1,000, and net migration of approximately zero.

Calculate the population growth rate as a decimal.

Express that growth rate as a percentage per year.

Calculate the doubling time using the rule of 70.

Show the calculation for the number of people added in the first year.

State the number of people added in the first year.

Identify the phenomenon that keeps this population growing after fertility falls to replacement level.

Explain the age-structure reason that phenomenon occurs.

Explain what this means for the total number of births over the coming decades.

Describe ONE policy that would slow population growth, including its mechanism.

Describe a SECOND, different policy, including its mechanism.