Chapter 20.2

Question 1

population dynamics

Answer 1

changes that occur in populations over time

Question 2

Predators

Answer 2

organisms that kill and consume other organisms known as prey

Question 3

selective pressure on predator and prey

Answer 3

• more successful consumers drive natural selection of the producers
• limited produces can limit consumer population

Question 4

Producers and consumers typically

Answer 4

co evolve as a result of their interactions, producers will evolve to produce mechanisms to protect them from harm, predator populations must also evolve to ensure survival

Question 5

Mutualism

Answer 5

both organisms are benefitted from each other

Question 6

Commensalism

Answer 6

one organism is benefitted, the other is neither helped or harmed

Question 7

Parasitism

Answer 7

one organism is benefitted, the other is harmed

Question 8

Succession

Answer 8

slow progressive change in community structure

Question 9

Primary succession

Answer 9

occurs where no life has occurred before

Question 10

Pioneer community

Answer 10

FIRST species to colonize an area and initiate succession

Question 11

Climax community

Answer 11

Latecomers in the process of succession. community remains relatively stable if there are no environmental changes

Question 12

Ecological disturbance

Answer 12

event that changes the structure of community

Question 13

Secondary succession

Answer 13

recolonization of an area after ecological disturbance, such as forest fire or flood or agricultural activity (soil is not always destroyed in ecological disturbance)