Practice Exam 3 questions

Scendesmus grown alone reaches a carrying capacity of 10,000 cells per ml. Euglena grown alone reaches a carrying capacity of 15,000 cells per ml on the same media and light conditions. When they are grown together Scendesmus reaches a density of 12,000 cells per ml and Euglena reaches a density of 16,000 cells per ml. Based on these results what is the relationship between Scendesmus and Euglena?

A. predator, prey B. mutualism C. competition D. disease, host

E. indifference

Given one has estimated the abundance of each species in a community, species richness (SR) is:

A. = 1 - Σp_i² B. = -Σp_i lnp_i C. the number of species in a community

D. proportional to lipid content E. all of the above

The logistic model of population growth assumes that the per capita growth rate _____ with increasing population size.

A. declines linearly B. declines exponentially C. is constant

D. declines parabolically E. increases exponentially

A disease that can kill infected individuals is said to be _________. The proportion of infected individuals killed is a measure of ________ .

A. virulent, virulence B. deadly, virulence C. contagious, vulnerability

D. a killer, prevalence E. benign, incidence

The term ‘species assemblage’ is a modern term for what previously emphasized word?

A. keystone species B. biome C. community D. organization

E. ecosystem

Calculate R₀ based on the following life table:

x l(x) m(x)

0 1.0 0

1 0.8 0

2 0.6 0

3 0.4 1.5

4 0.2 1

5 0

A. 0.6 B. 1.0 C. 1.1 D. 2.5 E. 0.8

The Freeman essay ‘Let-it-burn Policies’ (p1239) was focused on the fires in what National Park?

A. Yosemite B. Great Smokey Mountain C. Yellowstone

D. Rocky Mountain E. Everglades

Which of the following is the best description of deciduous trees?

A. they have separate sexes

B. they have broad leaves which drop seasonally

C. they have needle-like leaves which drop seasonally

D. they have broad leaves which drop continuously

E. they have needle-like leaves which drop continuously

Both the geometric growth and exponential growth models imply that the doubling time of a population will be __________.

A. increasing linearly B. increasing exponentially C. constant

D. decreasing linearly E. exponentially decreasing

An independent study student comes to the Woodworth prairie and captures, marks and releases 20 painted lady butterflies in 2 hours. Three days latter she goes to the prairie in Glenview and in 4 hours captures 35 butterflies 40% of which were marked (14 to be exact). Assuming no immigration, no emigration from this small patch of prairie and no births or deaths, what is your calculated estimate of the population of painted ladies at Woodworth prairie?

A. 87.5 B. 49.5 C. 50 D. 52.5 E. 56

Of the following four Lake Michigan fish, two are native and two are exotic. Which two are native?

1. Smelt 2. Alewife 3. Perch 4. Whitefish

A. 1, 2 B. 1, 3 C. 1, 4 D. 2, 4 E. 3, 4

A(n) _____ has many trees, so many that they capture almost all the sunlight before it reaches the ground. The ground is filled with herbaceous vegetation only in spring.

A. savanna B. wetland C. prairie D. deciduous forest E. dessert

If an annual plant population is growing geometrically with a lambda, λ, of 1.5, what will be the size of population of 400 individuals after 2 generations?

A. 900 B. 1200 C. 1350 D. 1406 E. 1800

The word that has the closest meaning to autochthonous is:

A. adventious B. native C. sterilize D. organismal E. exotic