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Published byEddy Carraway Modified over 10 years ago
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POPULATIONS LAST UNIT!!!! WAHOOOO!!!
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OBJECTIVES: -Describe the factors that affect the carrying capacity of the environment. -Explain how change in population density is affected by emigration, immigration, birth rate and death rate, and relate these factors to the exponential growth of human populations. - Explain how technological advances have affected the size and growth rate of human populations throughout history.
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Exponential is growth that would take place under ideal conditions with unlimited resources.
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Logistical is growth that is eventually limited to a number (carrying capacity) that can be supported by environmental resources.
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Carrying Capacity: The number of individuals in a population that an environment can support.
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Logistical Growth Curve Exponential Growth Curve
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DENSITY DEPENDENT VS. DENSITY INDEPENDENT Logistical growth is affected by DENSITY DEPENDENT factors. These are things that affect the population as it gets more and more dense… For example: Running out of food Running out of places to live Other limited resources Spread of disease DENSITY INDEPENDENT factors = things that affect the population no matter if it is large or small. For example, a hurricane.
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How did we get so big so fast???
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1.Birth Rate: the amount of births for a given time period 2.Death Rate: the amount of deaths for a given time period 3.Immigration: movement of organisms INTO an area occupied by an existing population 4.Emigration: movement of organisms OUT of an area where population is located
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A graph that shows a population ’ s growth based on AGE and GENDER. Age Groups: 1. Pre-Reproductive= 0-4 through 15-19 2. Reproductive= 20-24 through 40-44 3. Post Reproductive= 45-49 through 80+ There are 3 types of growth patterns: 1. Rapid Positive Growth 2. Slow Positive Growth 3. Negative Growth
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YEAST POPULATION LABS
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After reviewing her data, the student decides to perform an additional trail at 35°C. She observes that the balloon inflates faster than during the trail in which the 30°C water was used. This additional trial supports which of the following hypotheses? a) The optimum temperature for yeast fermentation is less than 35°C b) Warmer temperatures are more favorable for yeast fermentation c) Yeast require less sugar when maintained at lower temperatures d) The time required for fermentation increases with increasing temperature
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The yeast were placed on a nutrient dish and allowed to grow. On which day was additional nutrient most likely added to the yeast culture? a) 3 b) 4 c) 6 d) 7
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