Lecture Six - Species Interactions

Question 1

Your textbook outlined a number of different types of interactions among species. Which type of interaction benefits BOTH species/populations that are involved?
A) competition
B) mutualism
C) predation
D) herbivory
E) parasitism/pathogens
F) commensalism

Answer 1

B) mutualism

Question 2

When nitrogen-fixing bacteria make associations with plants, the plants get access to nitrogen. Given that this is a mutualism, what do you think the bacteria get from the plants?
A) carbon
B) phosphorus
C) water
D) iron

Answer 2

A) carbon

Question 3

Consider the distributions of Balanus and Chthalamus, and their respective fundamental niches. Given what is typically seen in nature, which of these two do you think is a better competitor?
A) Balanus
B) Chthalamus

Answer 3

B) Chthalamus

Question 4

What types of species interactions include a negative effect on one (or both) species? Select all that apply:
A) predation
B) mutualism
C) herbivory
D) parasitism/pathogens
E) competition
F) commensalism

Answer 4

A), C), D), & E)

Question 5

A lion attacking and eating an antelope is an example of:
A) predation
B) competition
C) parasitism
D) mutualism

Answer 5

A) predation

Question 6

Species that are symbiotic live in close physical contact with each other

True or False?
All symbiotic relationships are mutualisms

Answer 6

False

Question 7

Why does competition negatively affect both species in the interaction? Select the best answer:
A) because their interactions result in disease
B) because one of the species lives inside of the other
C) because they require the same limiting resource(s) for survival and reproduction
D) because they always competitively exclude one another

Answer 7

C) because they require the same limiting resource(s) for survival and reproduction

Question 8

What is a fundamental niche?

Answer 8

Where a species can live, it is based on requirements of food, air, and space

Question 9

What is a realized niche?

Answer 9

Where a species ACTUALLY lives, Chthalamus does not live where Balanus lives because Balanus is a better competitor

Question 10

Consider a unicellular organism with DNA that contains no spaces within genes. What domain of life could this organism belong to? Select all that apply:
A) Bacteria
B) Archaea
C) Eukarya
D) Protista

Answer 10

A) Bacteria

Question 11

Plasmodium is a genus of protists that contain organisms that feed off of the contents of humans cells and make humans sick. The relationship between the Plasmodium and the humans is best described as:
A) -/-
B) 0/+
C) +/+
D) 0/-
E) +/-

Answer 11

E) +/-

Question 12

In the previous question about Plasmodium, which organism is gaining and which is losing in the interaction? Briefly explain your reasoning

Answer 12

Plasmodium is gaining and humans are losing. This is because plasmodium is gaining their nutrients from the humans to benefit them but from their feeding, humans become ill which makes them lose the interaction

Question 13

Which of the following types of organisms require chemical energy (sugar) to function properly? Select all that apply:
A) archaea
B) plants
C) protists
D) bacteria
E) animals
F) fungi

Answer 13

ALL OF THE ABOVE