Biology –9 th Grade

CHAPTER 5 NOTES

CHARACTERISTICS OF A POPULATION DENSITY GROWTH RATE GEOGRAPHIC DISTRIBUTION

3 FACTORS THAT AFFECT POPULATION # OF BIRTHS # OF DEATHS # OF IND. THAT ENTER AND LEAVE A POPULATION

2 TYPES OF POPULATION GROWTH

EXPONENTIAL GROWTH POPULATION GROWS EXTREMELY RAPID AND AT A CONSTANT RATE

LOGISTIC GROWTH DOES HAVE A PERIOD OF EXP. GROWTH, BUT WILL STOP OR SLOW DOWN. GOES THROUGH A # OF PHASES. *Carrying capacity – total # of individuals a pop. can support

LIMITING FACTOR FACTOR THAT CAUSES THE POPULATION TO DECREASE

Density-Dependent Limiting Factors Factors that depend on the size of a population Examples – Competition, predation, disease, parasitism

Density-Independent Limiting Factors Affect all pop. regardless of pop. size. Examples – Natural disasters, Weather, and human activities

QUIZ – CH. 5 1.List 3 factors that affect population growth. 2.What are 3 characteristics of a population? 3.What type of growth goes through a period of rapid growth, and slows down or stops?

4. What is the term for the largest # of individuals a population can hold? 5. What type of growth grows at a constant rate? 6. List some density-dependent limiting factors. 7. List some density-independent limiting factors.

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