Deck 10: Population Growth

Question 1

When populations breed seasonally, with young produced once a year, we say growth is

A) Exponential
B) Geometric
C) Compounded
D) Annual
E) Episodic

Answer 1

Geometric

Question 2

Geometric growth is described by the equation

A) N_t=R₀N_t+1
B) R₀=N_t/N_t+1
C) N_t+1=R₀N_t
D) N_t=R₀N_x
E) x=R₀/N_t

Answer 2

N_t+1=R₀N_t

Question 3

If R₀³=2.0 and N₀=200, then population size after 3 generations is

A) 800
B) 1600
C) 202
D) 400
E) 1200

Answer 3

400

Question 4

If the finite rate of increase, $\lambda$ , is less than 1, then the population

A) Increases
B) Decreases
C) Stays the same
D) Decreases to a low level then remains constant
E) Increases to the carrying capacity

Question 5

If $\lambda$ =1.1 and N_t=1000, then N_t+4=

A) 1100
B) 1464
C) 4000
D) 4400

Question 6

You are involved in a bird count. One year you count 80 red-winged blackbirds and the next year the number is only 60. What is the finite rate of increase?

A) 20
B) 140
C) 0.25
D) 1.33
E) -0.25

Question 7

If a population of rabbits increases from 1000 to 1500 over 10 years, what is the cumulative rate of increase as a percentage?

A) 1.5
B) 0.5
C) 50
D) 100
E) 150

Question 8

If a population of rabbits grows by 50% over 10 years, what is the average finite rate of increase per year?

A) 1.5
B) 50
C) 1.04
D) 57.67
E) 38.44

Question 9

If a population of duckweed, if b=0.4 per week and d=0.2 per week and N=50, how many plants will there be after one week?

A) 10
B) 30
C) 50
D) 60
E) 100

Question 10

If N₀=10, t=4 and r=0.1, then N_t+4=

A) 4
B) 10
C) 14.9
D) 40
E) 11.05

Question 11

For a variety of organisms r increases with

A) Increasing generation time and increasing body weight
B) Increasing generation time and decreasing body weight
C) Decreasing generation time and increasing body weight
D) Decreasing generation time and decreasing body weight

Question 12

If r=0.1, how long does it take a population to double?

A) 6.93 years
B) 0.7 years
C) 20 years
D) 0.05 years
E) 0.75 years

Question 13

Rabbits were introduced into Victoria, Australia, in about 1860. Approximately how long did it take them to cross the country and appear on the west coast?

A) 10 years
B) 20 years
C) 50 years
D) 100 years
E) 150 years

Question 14

You have a weed growing exponentially on your pond. It doubles in numbers every day. Unchecked it will cover the pond in 40 days. You decide to weed the pond when it's half covered. On what day is that?

A) 10
B) 20
C) 30
D) 35
E) 39

Question 15

The intrinsic rate of increase is

A) The rate of population growth under ideal conditions
B) The rate of population growth for r selected species
C) The rate of population growth when resources are limiting
D) Independent of predation and competition
E) Density dependent

Question 16

Population growth under conditions of limited resources is termed

A) Exponential
B) Geometric
C) Logistic
D) Lagged
E) Stochastic

Question 17

In which condition will a population increase?

A) R₀ = 0
B) R₀ = 0.5
C) r = 0.5
D) r = -0.5
E) $\lambda$ = 0.9

Question 18

If N=500, K=1000 and r=0.1, what is dN/dt?

A) 50
B) 100
C) 150
D) 25
E) 125

Question 19

If there is a time lag such that at the time the population is 800, the effects of crowding are only being felt as if the population were 500, then what is dN/dt if r=0.2 and K=1000?

A) 0.5
B) 400
C) 80
D) 160
E) 100

Question 20

A source of mortality that decreases with increasing population size is

A) Density dependent
B) Density independent
C) Inversely density dependent
D) Inversely density independent
E) Inversely density negative independent

Question 21

A population whose growth is well modeled by the logistic growth equation is experiencing

A) Density dependent growth
B) Density independent growth
C) Inverse density dependent growth
D) Inverse density independent growth

Question 22

Which of these organisms is continuously iteroparous?

A) Dall mountain sheep
B) Agave
C) Salmon
D) Blue tits
E) Chimpanzees

Question 23

In Grime's life history scheme ruderals are adapted to

A) Live in highly competitive environments
B) Take advantage of habitat disturbances
C) Be density dependent
D) Live near the carrying capacity
E) Maximize reproductive output

Question 24

In general, the growth pattern of human population through history shows a/an ______ pattern.

A) Logistic
B) Exponential
C) Sigmoidal
D) Standard geometric
E) Declining

Question 25

After the demographic transition, human birth rates

A) Exceed death rates
B) Equal death rates
C) Are less than death rates by a factor of 2
D) Are double death rates
E) Are logistic

Question 26

The potential reproductive output under ideal conditions is called

A) Fertility
B) Fecundity
C) Ideal fertility
D) Maximal reproductive output
E) Ideal maximum reproductive fertility

Question 27

Citizens in which of the following countries have the largest ecological footprint?

A) Canada
B) Germany
C) U.K.
D) Australia
E) China

Question 28

Exponential growth occurs when species breed continuously and overlapping generations are found.

Question 29

In population growth, R₀ reflects a generational growth rate while r denotes an instantaneous rate.

Question 30

Exponential growth tends to result in "S" shaped growth curves.

Question 31

Logistic growth yields a J shaped curve

Question 32

Desert animals may be seen as stress tolerators.

Question 33

Oak trees are r-selected compared to dandelions.

Question 34

The demographic transition occurred earlier in Mexico than in Sweden.

Question 35

Children under 15 make up half the population in West Africa.