True or False. In linear growth there is a fixed number of cells that reproduce in each generation
True. In the meristem case only two cells reproduce
100
Does the following situation represent exponential growth?
Four bacteria live in a nutrient-rich solution. When each bacterium divides, it produces two new bacteria. When four bacteria reproduce, eight cells will result. Those eight will reproduce and give rise to sixteen cells.
Yes
100
True or false. Logistic growth is a type of exponential growth that occurs in environments without various factors that restrict growth
False, there are various factors that restrict growth
100
When does competition occur?
When there is niche overlap
100
True or False. Environmental factors do not affect carrying capacity
False, environmental factors do affect carrying capacity
200
What is the equation for linear growth and what do each variable represent?
N = ct + No
c= rate of increase (change in population size per unit time)
t = time (in generations)
No = initial population size
200
True or False. In exponential growth a fixed proportion of cells reproduce
True
200
What is the lag phase?
The number of births is greater than the number of deaths, but the growth is slow because of the small number of individuals.
300
What is the slope?
dN/dt = slope = c
300
What is the equation for exponential growth? What does each variable represent?
N = NoE^(rt)
e = Euler's number (2.718)
r = intrinsic rate of increase
t = time (in generations)
No = initial population size
300
What is the log phase?
As time passes, the number of individuals increases, the birth rate rate still exceeds the death rate and the population enters a period of rapid growth
300
12. In which of the following types of population growth is the rate of growth independent of population size?
A. Linear
B. Unrestricted exponential
C. Logistic
D. Both B and C
E. None of the above
A
300
How does the initial population size affect the time required to reach carrying capacity?
When the initial population is bigger the time is smaller
400
What is the constant in linear growth?
rate of increase
400
What is the slope in unrestricted exponential growth?
dN/dt = slope = rN
400
What is the stationery phase?
Eventually, food becomes scare. room runs out, and pollution rises. Population size does not change because the birth and death are equal.
400
Without regard to the mode of population growth, which of the following best characterizes the rate of population growth?
A."N"
B."dN"
C.The slope of the population size versus time graph at any point in time.
D.All of the above characterizes the rate of population growth.
E.None of the above characterizes the rate of population growth.
C
400
What is growth rate influenced by in logistic growth?
The difference between carrying capacity and population size
500
What is independent of population size in linear growth?
Growth rate = c = dN/dt
500
What is the growth rate proportional to? Is the rate of incrase and slope constants?
population size and no
500
What is the carrying capacity?
The number of individuals in a population that an environment can support indefinitely
500
Which of the following characterize(s) exponential growth?
A.The slope of the population size versus time graph is proportional to population size.
B.The size of the population is constant.
C.The number of organisms added per unit time is constant.
D.A fixed number of organisms in the population may reproduce in each generation.
E.All of the above characterize exponential population growth.