Chapter 14

Question 1

The evolution of two interacting species, each in response to selection pressure imposed by the other.

Answer 1

coevolution

Question 2

A parasite that lives on the surface of another organism.

Answer 2

ectoparasite

Question 3

A parasite that lives inside the body of its host organism.

Answer 3

endoparasite

Question 4

A specific defensive response that makes particular plant genotypes resistant to particular parasite genotypes.

Answer 4

gene-for-gene interaction

Question 5

An organism on or within which a parasite or other symbiont lives.

Answer 5

host

Question 6

Relatively large parasite species, such as arthropods and worms.

Answer 6

macroparasites

Question 7

Parasite species too small to be seen with the naked eye such as bacteria, protists, and fungi.

Answer 7

microparasites

Question 8

An organism that lives in or on a host organism and feeds on its tissues or body fluids.

Answer 8

parasite

Question 9

A parasite that causes disease.

Answer 9

pathogen

Question 10

An organism that lives in or on an organism of another species, referred to as its host; is the smaller member of a symbiosis.

Answer 10

symbiont

Question 11

The minimum number of individuals susceptible to a disease that must be present in a population for the disease to become established and spread.

Answer 11

threshold density