Question 1 Life tables can be based on the __________. Question 1 options: ages

Question

Question 1

Life tables can be based on the __________.

Question 1 options:

ages of organisms

life cycle stages of organisms

sizes of organisms

all of the above

Question 2

Refer to the table below showing the survivorship, fecundity, and life expectancies for U.S. females of various ages as of 2005:

Approximately 1.5 million females were born in the United States in 2005. Based on this fact and the life table data above, how many of them should we expect to live to at least age 90?

Question 2 options:

149,500

305,500

376,500

654,500

Question 3

Refer to the table in the previous question. What was the approximate survival rate (Sx, which is not shown directly in the table) for a woman between the ages of 75 and 80 in 2005?

Question 3 options:

18%

60%

72%

83%

Question 4

A population of rabbits reproduces in synchrony at discrete time periods each year. If the current population is 150 and its geometric population growth rate is 1.4 per year, the expected size of the population after two years will be __________.

Question 4 options:

107

196

210

294

Question 5

Which population(s) is/are increasing in size?

Question 5 options:

a population with an r = 0.04

a population with a = 1.3

a population with a = 0.98

both A and B

Question 6

A continuously growing population of bears has a current population size of N = 500 and an intrinsic rate of increase of r = 0.07 per year. Assuming that this rate of increase remains the same, about how long should it take for the population to reach 1,000 individuals? NOTE: The natural logarithm of 2 is about 0.70.

Question 6 options:

5 years

10 years

20 years

35 years

Question 7

Which statement about density-dependent or density-independent growth is true?

Question 7 options:

Density-independent factors do not have large effects on population size

A decrease in birth rate with increasing population size is a density-independent factor

An increase in emigration rate with increasing population size is a density-dependent factor

Only density-independent factors can regulate population size

Question 8

The logistic equation assumes that __________.

Question 8 options:

density-dependent factors regulate population growth

density-dependent factors do not regulate population growth

the per capita growth rate is a constant

the per capita growth rate increases with increasing density

Question 9

Use the graph below to determine the point at which the population growth rate is maximized under the logistic model:

Question 9 options:

when N is extremely small

when N = K/2

when N = K

when N is very large

Question 10

In the logistic growth model, which term determines the maximum number of individuals a population can sustain?

Question 10 options:

r

N

K

dN/dt

A)

ages of organisms

B)

life cycle stages of organisms

C)

sizes of organisms

D)

all of the above

TABLE 10.2 Survivorship, Fecundity, and Years of Life Remaining by Age for in 2005 Age (in years) Survivorship Fecundity Expected no. of years of life remaining (at age 0.0 79.9 0.994 0.0 75.5 0.993 0,0 0.992 10 0.0 15 0.99 0.004, 65.6 0.990 0,203 60.7 55.9 0.987 0.511 0.985 0.578 51.0 35 0.98 0.479 46.2 0.976 0.232 41.4 0.967 0.046 0.954 0.003 32.2 0.936 0.0 27.8 235 0.911 0.0 0.87 0.0 19.5 0.814 0.0 15.6 75 0.729 0.0 12.1 0,0 9.1 0.436 0.0 0.25 0.0 4.7 95 0.0 3.2 100 0.022 0.0 2.2 Source: Martin et al (2000) and Arias etal.2010).

Explanation / Answer

Ans 1 d all of the above

A life table shows what is the probability that an organism would die before his or her next birthday. Its the probability of death of an individual. So it depends on all 3 factors

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