Question

figure 3

1. it took 125 years (1800 - 1925) for the human population to increase in size by 1 billion.

a) approximately how many years were needed to increase from 2 to 3 billion?
b) how many years is it expected to take for the next 1 billion increase (from 3 to 4 billion)?
c) what trend is occurring within the human population as far as the amount of time needed to increase population by 1 billion.

1. has the human population reached a peak similar to the yeast population in your graph?
2. what are some problems that may occur if the human population continues to increase?
3. explain how the factors listed below could affect a population of organisms.

a) lack of available space
b) food shortage
c) increased production of \waste products\

Explanation:

Step1: Determine years for 2 - 3 billion

From the graph and given information, we can see that the population reached 2 billion around 1925 and 3 billion around 1960. So we subtract the years.
$1960 - 1925=35$ years

Step2: Determine years for 3 - 4 billion

The population reached 3 billion around 1960 and 4 billion around 1974. Subtract the years.
$1974 - 1960 = 14$ years

Step3: Identify the trend

As we calculated, it took 125 years for the first billion - increase (1 - 2 billion), 35 years for the second (2 - 3 billion) and 14 years for the third (3 - 4 billion). The trend is that the time required for the human population to increase by 1 billion is decreasing.

Step4: Answer question about peak

No, the human population graph does not show a peak like the yeast population would in a typical growth - decay model. The human population graph is still increasing.

Step5: List problems of population increase

Problems include strain on resources (food, water, energy), increased pollution, overcrowding, and potential social and economic unrest.

Step6: Explain factor effects

a) Lack of available space

It can limit the growth of a population as organisms may not have enough room to live, breed, and find resources. It can lead to increased competition and potentially higher mortality rates.

b) food shortage

It can cause malnutrition, lower reproductive rates, and higher death rates in a population. Organisms may also have to compete more for the limited food resources.

c) Increased production of "waste products"

It can lead to pollution of the environment, which can be harmful to organisms. It can contaminate water, air, and soil, leading to health problems and potentially reducing the population size.

Answer:

a) 35 years
b) 14 years
c) The time required for the human population to increase by 1 billion is decreasing.

1. No
2. Strain on resources, increased pollution, overcrowding, social and economic unrest.

11.
a) Limits growth, increases competition and mortality.
b) Causes malnutrition, lower reproductive and higher death rates, increases competition.
c) Leads to pollution, health problems and may reduce population size.