Exam 3 Questions Flashcards
A species of green has developed a peculiar relationship with freshwater turtles in Australia. The algae grows on the head of the turtle, gaining protection as well as substrate. The turtle is more or less oblivious to the presence of this hitchhiker. This relationship would be described as
a. Amensalism
b. Commensalism
c. Competition
d. Parasitism
B
When a species of bird preys upon the seeds of a plant and favors the smallest seeds
a. the prey species functions as an agent of natural selection on the predator
b. natural selection favors individual plants that produce the largest seeds
c. the plants compensate for their losses by producing proportionally more smaller seeds
d. the bird species is unaffected when directional selection favors plants that produce the largest seeds
B
Tetrodotoxin is produced by newts to reduce predation pressure exerted on the population by garter snakes. A population with many garter snakes and newts that produce high tetrodotoxin means that this population…
a. has low-toxicity Taricha (newt) individuals
b. high-toxicity Taricha individuals
c. highly vulnerable garter snake population
d. highly resistant garter snake population
D
Two species of cattail (Typha) live in shallow water along the shoreline of ponds. Although Typha Agustifolia can live by itself in water 0-20cm deep, in the presence of Typha Latifolia, it occurs only in water >20cm deep, whereas Typha Latifolia occurs in shallower water. In this example, T. agustifolia is limited by competition exploiting its
a. coevolution
b. carrying capacity
c. realized niche
d. fundamental niche
C
Circle back to the toxic newts. A novel predator (Indian Mongoose) is introduced to California. The Mongoose consumes the toxic newt and dies immediately. This suggests the toxin produced by the newts is
a. toxic to general vertebrate predators
b. specific to garter snakes only
c. this is a direct result of the coevolution of the newt and mongoose
d. ineffective to prevent predation
A
What does the following formula represent: dN1 / dt = r1N1 (1 - (N1+N2) / K1)
a. population growth of species 1 in absence of species 2
b. population growth of species 1 in presence of species 2
c. carrying capacity of species 1 in absence of species 2
d. population size in the presence of species 2
B
The carrying capacity for species 1 is 2000 and for its competitor, species 2, it is 500. What is the maximum abundance of species 1 if 250 of species 2 coexists with it?
a. 250
b. 1000
c. 500
d. 1250
B
Paramecium aurelia has a higher rate of population growth and can tolerate a higher population density than P. caudatum. When both species are introduced to the same habitat, P. caudatum dies out as P. aurelia consumes the majority of the resources. This is an example of what type of competition?
a. Overgrowth
b. Preemptive
c. Consumption
d. Encounter
C
The occupation of space by a sessile organism, such as a barnacle, that precludes the establishment or occupation by another species is referred to as
a. Overgrowth
b. Preemptive
c. Consumption
d. Encounter
B
A coyote and a crow happen across a freshly departed goat. They are both competing for this random goat laying dead next to the road. This is referred to as
a. overgrowth
b. preemptive
c. consumption
d. encounter
D
In the following formula, what is B?
dN2 / dt = r2N2 (1 - (N2+BN1)/K2)
a. competition coefficient
b. growth rate
c. carrying capacity
d. population size
A
Which of the following is NOT considered a resource shaping interspecific competition?
a. Food
b. Space
c. Mates
d. Essential nutrients
C
Two bird species compete in the forest for the same seeds. If a=.75 and B=.25 , then…. (assume same carrying capacity for both)
a. rate of seed consumption is same for both species
b. environment can supply both species since the sum of competition coefficients equals 1
c. species 1 “wins” and will outcompete species 2
d. species 2 “wins” and will outcompete species 1
D
The portion of potential resources and conditions that an organism actually exploits as a result of interactions with other species is its
a. home range
b. territory
c. realized niche
d. fundamental niche
C
An organism that feeds on plant or algal tissues is referred to as a(n)
a. herbivore
b. omnivore
c. carnivore
d. decomposer
A
