L100 – Lecture Quiz #6
ANSWER KEY
1.
On the graph below draw two lines  one showing a logistic growth curve and one showing
an exponential population growth curve.
Label curves.
You only have to sketch in a curve
showing a typical logistic growth curve and a typical exponential curve. (2.5pt)
2.
Indicate carrying capacity on the above graph with a dotted line.
Are both of these
population growth curves influenced by a carrying capacity?
If not, which one isn’t? (1pt)
Carrying capacity influences logistic growth; not exponential growth. Exponential
growth is unconstrained – no limits on growth. Logistic growth takes into
consideration the resources available in the habitat that supports the population.
3.
What is carrying capacity? Is it always constant?
If so, why?
If not, why might it change?
(1pt)
Carrying capacity is the amount of resources needed to support the population.
No, carrying capacity
is not constant.
It
could change as the resources or habitat
changes. It could change as a result of a decrease/increase in food supply,
increase/decrease in predation pressures, loss of habitat through storms, etc….
.
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In the figure below each letter is a species within a community.
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 Fall '11
 Dr.SusanHengeveld
 Photosynthesis, trophic level

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