Biology

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Biology 9th Grade
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CHAPTER 5 NOTES
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CHARACTERISTICS OF A POPULATION

• DENSITY
• GROWTH RATE
• GEOGRAPHIC DISTRIBUTION

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3 FACTORS THAT AFFECT POPULATION

• OF BIRTHS
• OF DEATHS
• OF IND. THAT ENTER AND LEAVE A POPULATION

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2 TYPES OF POPULATION GROWTH
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EXPONENTIAL GROWTH

• POPULATION GROWS EXTREMELY RAPID AND AT A
  CONSTANT RATE

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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

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LIMITING FACTOR

• FACTOR THAT CAUSES THE POPULATION TO DECREASE

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Density-Dependent Limiting Factors

• Factors that depend on the size of a population
• Examples Competition, predation,
• disease, parasitism

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Density-Independent Limiting Factors

• Affect all pop. regardless of pop. size.
• Examples
• Natural disasters,
• Weather, and human activities

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

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• 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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