Ecology Exam 3-Ch. 17

Question 1

Generalists

Answer 1

A species that interacts with many other species

Question 2

Specialists

Answer 2

A species that interacts with one other species or a few closely related species

Question 3

Obligate mutualists

Answer 3

Two species that provide fitness benefits to each other and require each other to persist

Question 4

Facultative mutualists

Answer 4

Two species that provide fitness benefits to each other, but the interaction is not critical to the persistence of either species

Question 5

Mycorrhizal fungi

Answer 5

Fungi that surround plant roots and help plants obtain water and minerals

Question 6

Endomycorrhizal fungi

Answer 6

Fungi characterized by hyphae threads that extend far out into the soil and penetrate root cells between the cell wall and the cell membrane

Question 7

Ectomycorrhizal fungi

Answer 7

Fungi characterized by hyphae that surround plant roots and enter between root cells but rarely enter the cells

Question 8

Cheating

Answer 8

When one species receives a benefit but does not provide one in return

Question 9

Mutualism

Answer 9

A positive interaction between two species in which one species receives benefits that only the other species can provide