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Ecology: Population Growth Curve Questions

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1. At which point is the actual growth rate of the population greatest?

2. At which point is the actual growth rate negative?

3. At which point is the logistically growing population growing at a rate that is closest to the biotic potential for a population of that size?

4. What does the hatched area represent?

5. Members of several species of desert shrub secrete chemicals from the roots that prevent other individuals from growing close to them. This is an example of ...?

6. A plant species that is strongly r-selected would likely ...?

7. The major factor determining the size of r in a species is ...?

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1. At which point is the actual growth rate of the population greatest?

The growth rate is the slope of the curve. The population is growing the fastest (the slope is highest) at B.

2. At which point is the actual growth rate negative?

Just like the slope of a line, the growth rate will be negative when the curve decreases from left to right. The growth rate is negative at E.

3. At which point is the logistically growing population growing at a rate that is closest to the biotic potential for a population of that size?

This would happen when the slopes of curves 1 and 2 seem ...

Solution Summary

Actual growth rates and closest biotic potentials are examined. The actual growth rate negatives are determined.

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See Also This Related BrainMass Solution

Biology study questions are posed.

Question 1
Choose the correct type of ecosystem for the following descriptions.

Mediterranean climate, usually on the west coast of a land mass

tundra
taiga
grassland
chaparral
savanna

Question 2 text
An arithmetic growth curve will have a steeper upward slope than an exponential growth curve.
True
False

Question 3 text Question 3
What seems to be the most influential factor in making possible the explosion in the human population that began around 1800?

more food production
the industrial revolution
conquering of diseases
genetic mutations

Question 4 text Question 4
A negative rate of increase, or a negative r, means that:

the population is declining in numbers.
the population has overshot K.
birth rates have decreased.
predation rates are greater than birth rates.

Question 5 text Question 5
Which of the following water uses is probably the highest in human society?

households
agriculture
sewage systems
industry

Question 6 text Question 6
If the population of mountain lions adds 10 new lions each year for 20 years, we would classify this type of growth as:

declining.
exponential.
arithmetic.
logarithmic.

Question 7 text Question 7
Which of the following might an ecologist study?

the general nature of digestive enzymes
the genetics of mosquitoes
the effects of increasing carbon dioxide on forest growth
the nature of the immune system in humans

Question 8 text Question 8
Dandelions have a short life span and a high investment in seed production, but each seed is small and wind-dispersed. This is an example of:

a K-selected species.
an equilibrium species.
an r-selected species.
a density-dependent species.

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