Populations Answers

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A population of ducks lives at a small pond that is slowly drying up. Which statement describes what will most likely happen over time?

A
Ducks will immigrate from the population
B
Ducks will emigrate to the population.
C
Ducks will emigrate from the population.
D
Ducks will immigrate to the population.
3

During one year a population of blue jays has zero population growth. Which must be true about the blue jay population at the end of the year compared to the beginning of the year?

A
It will have the same number of individuals in it.
B
It will have the very same individuals in it.
C
It will have become larger.
D
It will have become smaller.
4

Which of these limiting factors could cause tree squirrels to lose their homes?

A
a natural disaster
B
an increase in predators
C
an animal disease
D
an increase in competition for food
5

Natural disasters, like an earthquake, can be a limiting factor to population growth. Which is an example of a natural disaster limiting population growth?

A
A zebra population being attacked by different lion herds.
B
Space in a forest becomes crowded, and a population of low-lying plants cannot get enough sunlight.
C
A strong thunderstorm destroys many of the nests of a bird population.
D
A month of colder air in the spring delays the growth of plants that provide food for a deer population.
6

Carrying capacityPopulation growthLimiting factorImmigration rate

A
Carrying capacity
B
Population growth
C
Limiting factor
D
Immigration rate
7

A population of frogs in a pond began with 67 individuals. Over one year, the population changed to 53.Which are two possible reasons for the change within the frog population?

A
emigration or increase in death rate
B
emigration or increase in birth rate
C
immigration or decrease in death rate
D
immigration or increase in birth rate
8

Which changes would most likely limit the growth of a plant-eating animal population? Select four options.The number of predators decreases.Steady rainfall increases the number of plants. A spring freeze kills many plants. The number of predators increases.A harmful plant disease spreads through the area.A harmful animal disease spreads among the population.

A
The number of predators decreases.
B
Steady rainfall increases the number of plants.
C
A spring freeze kills many plants.
D
The number of predators increases.
E
A harmful plant disease spreads through the area.
F
A harmful animal disease spreads among the population.
10

Which scenario would result in a decrease in population size, or a negative population growth?Use this formula:population growth = (birth rate + immigration) – (death rate + emigration)

A
0 individuals emigrate, 14 individuals die, 14 individuals are born, 14 individuals immigrate
B
40 individuals emigrate, 0 individuals die, 10 individuals are born, 28 individuals immigrate
C
12 individuals emigrate, 5 individuals die, 17 individuals are born, 0 individuals immigrate
D
19 individuals emigrate, 4 individuals die, 25 individuals are born, 0 individuals immigrate

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