Module 8 Lesson 6 - 4

Self-Check 

1. Refer to the age pyramids above. Which statement is true regarding the birth and death rates for each country?
   
   
   1. In Sweden, the birth rate is increasing, and the death rate is decreasing.
   2. In DR Congo, the birth rate is increasing, but the death rate is not decreasing.
   3. In Japan, the birth rate has stabilized, but the death rate is still lower than Sweden's is.
   4. In all three countries, population growth rate is either stabilizing or decreasing.


2. A J-curve is not characterized by
   
   
   1. a lag phase
   2. an exponential phase
   3. a stationary phase
   4. a crash phase


3. Introduced species without predators are likely to
   
   
   1. grow at their biotic potential
   2. grow logistically until environmental resistance results in a carrying capacity
   3. grow at their biotic potential only if food and other density dependent factors are in excess
   4. show sharp spikes and crashes in their growth curves


4. Which of the following describes an organism reproducing at its biotic potential?
   
   
   1. Large body size
   2. Late reproductive age
   3. Stable environment
   4. Large number of offspring
      
      
5. r-selected species typically
   
   
   1. display a J-curve on the growth rate graph
   2. display an S-curve on the growth rate graph
   3. go through population spikes and crashes

   4. stabilize at a population number called the carrying capacity a and c
      
      

6. The growth rate (gr) of a population that has increased from 10 to 20 in 5 years is
   
   
   1. +2/y
   2. 0.5
   3. +10
   4. 100%
      
      
7. The advantage of calculating per capita growth rate is
   
   
   1. it incorporates the element of time and population change
   2. it indicates by how much the population has grown
   3. it indicates how much growth each organism is responsible for
   4. it can be used to indicate positive and negative growth
      
      
   
   
8. The formula for change in population is
   
   
   1. (births + deaths) - (immigration + emigration)
   2. (births - immigration) + (deaths - emigration)
   3. (births + immigration) - (deaths + emigration)
   4. (births - deaths) + (immigration - emigration)
      
      
9. In the logistic growth pattern, exponential growth ends due to the environmental resistance caused by
   
   
   1. lack of food
   2. lack of space
   3. increased parasitism
   4. increased predation

   5. all the above
      
      

10. Human populations
    
    
    1. have shown a logistic growth pattern
    2. follow an S-shaped curve
    3. are at carrying capacity
    4. are increasing exponentially
       
       
11. Triangular-shaped age pyramids typify countries that are experiencing
    
    
    1. exponential growth
    2. negative population growth
    3. logistic growth
    4. stabilizing population numbers