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ECO 6-5 EVEN 4th

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

A population will increase if
a.
natality decreases
b.
mortality increases
c.
the environmental resistance increases
d.
the biotic potential increases
e.
all of these answers
 

 2. 

Which of the following is NOT a likely explanation as to why most populations in nature exhibit clumped dispersion patterns?
a.
It ensures that members of the same species are always available for reproductive efforts.
b.
Important natural resources can also be clumped in nature.
c.
Living and hunting in packs improves the success rate of some predators.
d.
This allows for protection against potential predators in that there is safety in large groups.
e.
All of these are likely explanations as to why many species exhibit clumped dispersion patterns.
 

 3. 

An exponential growth curve depicting an ever-growing population is shaped like the letter ____.
a.
J
b.
L
c.
M
d.
U
e.
S
 

 4. 

Carrying capacity refers to
a.
the proportion of males to females
b.
the maximum size of population the environment will support
c.
interaction of natality and mortality
d.
the intrinsic rate of increase
e.
reproductive rate
 

 5. 

A population crash occurs when
a.
A population greatly overshoots carrying capacity, and resulting environmental pressures cause effects.
b.
The population growth rate slows.
c.
Environmental resistance comes into play gradually.
d.
A population approaches its carrying capacity.
e.
Resources are essentially unlimited.
 

 6. 

Which of the following is the most commonly exhibited population dispersion pattern in nature?
a.
circular
b.
clumped
c.
uniform
d.
elongated
e.
random
 

 7. 

The biotic potential of a population
a.
is the maximum reproductive rate of a population
b.
is the future rate of growth of a population
c.
is the current rate of growth of a population
d.
can be determined only by studying an age structure diagram.
e.
is an expression of how many offspring survive to reproduce
 

 8. 

Which of the following factors leads to an increase in biotic potential?
a.
too many competitors
b.
specialized niche
c.
optimal level of critical nutrients
d.
too much or too little light
e.
low reproductive rate
 

 9. 

Which of the following is typically characteristic of a K-strategist species?
a.
high offspring mortality
b.
give very little parental care
c.
low survival rate of offspring
d.
long gestation periods
e.
tend to produce high numbers of offspring
 

 10. 

A logistic growth curve depicting a population that is limited by a definite carrying capacity is shaped like the letter ____.
a.
U
b.
L
c.
M
d.
S
e.
J
 

True/False
Indicate whether the statement is true or false.
 

 11. 

Organisms with random distributions are fairly rare.
 

 12. 

Exponential growth has a s-shaped growth curve.
 

 13. 

Most populations live in patches.
 

 14. 

Most populations live in clumps.
 

 15. 

When calculating population change, deaths and immigration are added together and both births and emigration are subtracted.
 

 16. 

When calculating population change, births and emigration are added together and both deaths and immigration are subtracted.
 

 17. 

Exponential growth has a j-shaped growth curve.
 

 18. 

When calculating population change, births and immigration are added together and both deaths and emigration are subtracted.
 

 19. 

Organisms with random distributions are fairly common.
 

 20. 

Logistic growth has a s-shaped growth curve.
 

 21. 

Another name for exponential growth is logistic growth.
 

 22. 

Another name for exponential growth is geometric growth.
 

 23. 

Logistic growth has a j-shaped growth curve.
 

Short Answer
 

 24. 

________ the combination of all factors that act to limit the growth of a population.
 

 25. 

The locations and sizes of populations vary with what?
 

 26. 

What does K represent?
 

 27. 

No population can grow indefinitely because of limitations on _______ and _________ between species for those resources.
 

 28. 

What is typical of an r-selected species? Provide two characteristics.
 

 29. 

List 4 reasons why populations clump?
 

 30. 

List 4 limiting factors on the growth of populations.
 

 31. 

What is typical of an K-selected species? Provide two characteristics.
 

 32. 

What does r stand for?
 

 33. 

What are four variables that determine population sizes?
 

 34. 

What are the three general patterns of population distribution or dispersion in a habitat?
 

 35. 

What are the three age structure categories for an age structure diagram?
 

 36. 

What does N represent?
 



 
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