Chapter 13 Competition (Q5)

Question 1

What is the direct reason for competition?

Answer 1

Limited resources in nature

Question 2

What is the exploitative mode of resource competition?

Answer 2

Differential ability to acquire resource

Question 3

Interference mode of resource competition =

Answer 3

direct aggressive interactions

Question 4

As each plant increases in size plant density____

Answer 4

decreases

Question 5

Competition for resources increases at ___ densities

Answer 5

higher population densities

Question 6

Intense competition leads to ____ among competing plants

Answer 6

mortality

Question 7

The self-thinning rule predicts that plants will _________ as the total biomass of the population increases

Answer 7

decrease in population density (self thin)

Question 8

Competition might result in: (3 things)

Answer 8

• smaller individuals
• death of individuals
• longer time to maturity

Question 9

Intraspecific competition within populations of planthopper Prokelisia marginata. As populations density of the planthopper P. marginata was increased the following was observed (3 things):

Answer 9

• lower survivorship
• increased development time
• reduced body size

Question 10

_____ is all of the environmental factors that influence growth, survival, and reproduction of a species

Answer 10

Niche

Question 11

Define Principle of Competitive Exclusion (2 things):

Answer 11

• 2 species with identical niches cannot coexist indefinitely
• better competitor eventually excludes the other

Question 12

Lotka-Voltera’s model of compeititon showed that _____________

Answer 12

Interspecific competition is weaker than Intraspecific competition

Question 13

Competition can restrict species to their __

Answer 13

realized niches

Question 14

Strong and pervasive competition leads to ___, this can change fundamental niche

Answer 14

evolutionary response

Question 15

Degree of competition depends on

Answer 15

niche overlap