Short Answer: Answer the following questions on the ANSWER SHEET 200 F 150 100 5

Question

Short Answer: Answer the following questions on the ANSWER SHEET 200 F 150 100 50 P. aurelia P. caudatum 3100 8 50 4 812 16 20 24 12 16 20 240 Days Days 16. Imagine you have two different paramecium species that have population growth curves as shown in the figures above when grown alone. If you grow two of these paramecium species together, what are the potential outcomes? List and describe two different outcomes and draw their populations on the provided graph (see answer sheet). 17. Imagine that in the year 2118, 100 years from now, the human population growth rate (r) is now zero. Explain what this means for the human population in terms of birth rates and death rates and provide a potential example of what could have occurred to make this happen.

Explanation / Answer

In the normal situation generally S shaped or sigmoid curve is obtained. this curve is divided in to lag phase, log phase, exponential, stationary phase and finally decline phase. at the lag phase the cell is found in resting stage and have planty of nutrients but as it moves to the log phase the nutrient consumption increases and the cells attain the maximum growth.after this when the nutrient is deplected the cell attend the stationary stage and finally due to deposition of excess metabolic waste the cell wii attain the decline and finally to death stage.

Competition is an interaction between two or more individuals both requiring the same limited resource that when used or defended by one individual reduces the survival or reproduction of another individual.

Competition usually reduces survival and reproduction in both individuals because both species cannot receive as much of the resource as they could if they were alone.

Competitive exclusion principle hypothesis that when 2 or more species coexist using the same resource, one must displace or exclude the other ("complete competitors" cannot coexist)

population change refers to change in the number of people during a specific time period.

Birth rate (or crude birth rate): The annual number of births per 1,000 total population.

Death rate (or crude death rate): The annual number of deaths per 1,000 total population.

Demographic transition: The historical shift of birth and death rates from high to low levels in a population. The decline of mortality usually precedes the decline in fertility, thus producing rapid population growth during the transition period.

To determine whether there has been population growth, the following formula is used: (birth rate + immigration) - (death rate + emigration).

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