Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 27, Problem 9RQ
a.
Summary Introduction
To draw:
The general shape of age and structure diagrams characteristics of (a) expanding, (b) stable and (c) shrinking population. And also explain why an individual can predict the next several decades of growth by the current age structure of populations.
Introduction:
Age structure graph is also called as population pyramid that shows the distribution of different age groups individuals within a population. Vertical axis of graph shows the different age groups of an individual while horizontal axis shows the gender of an individual. This diagram is used to predict the age distribution and growth of future population.
b.
Summary Introduction
To determine:
The general shape of age and structure diagram characteristics of a stable population.
c.
Summary Introduction
To determine:
The general shape of age and structure diagram characteristics of shrinking population.
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Students have asked these similar questions
Are the following statements True or false?
1) Population growth of many species is expected to be either exponential or geometric, unless some factor such as competition or predation is introduced.
2) The age distribution of populations reflects the influence of per capita rates of births, death, immigration, and emigration.
During what phase of the growth curves in each diagram is the population just beginning
to colonize an area? (C)
a) Which type of population growth appears to continue unchecked?
b) The growth curves in the Model are often referred to using the letters of the alphabet
they resemble. The logistic growth curve is sometimes referred to as an S-curve.
What letter would you use to describe the exponential growth curve?
c) What causes the population to slow down during logistic growth?
d) The maximum population an environment can sustain is affected by environmental
factors that cause the population to level out or become stable. What term is used to
describe this level of logistic growth?
Diagram A-Exponential Growth Curve
Population Numbers
Exponential
growth
Lag phase
Time
Population Numbers
Diagram B-Logistic Growth Curve
Lag phase
Time
Carrying
capacity (K)
Pressure begins due to
environmental resistance
1.) At approximately what year did the human population enter an exponential growth phase?
2.) Prior to that time, what was the approximate carrying capacity of Earth?
3.) State three significant technological developments that have acted to increase the carrying capacity of Earth’s environment since that time.
4.) Provide two examples of density-dependent factors that are contributing to or have the potential to contribute to environmental resistance in human populations.
Chapter 27 Solutions
Biology
Ch. 27.1 - Prob. 1CSCCh. 27.1 - Prob. 1HYEWCh. 27.1 - The Return of the Elephant Seals Female elephant...Ch. 27.1 - Prob. 1CYLCh. 27.1 - describe how the growth rate interacts with...Ch. 27.1 - Prob. 3CYLCh. 27.2 - What factors might make these population data...Ch. 27.2 - Prob. 2TCCh. 27.2 - What benefits does mass emigration give to animals...Ch. 27.2 - Prob. 1CSC
Ch. 27.2 - Prob. 1CYLCh. 27.2 - Prob. 2CYLCh. 27.2 - Prob. 3CYLCh. 27.3 - Prob. 1CYLCh. 27.3 - Prob. 2CYLCh. 27.3 - Prob. 3CYLCh. 27.4 - Prob. 1CYLCh. 27.4 - Prob. 1CTCh. 27.5 - Prob. 1TCCh. 27.5 - Prob. 2TCCh. 27.5 - Prob. 3TCCh. 27.5 - describe the advances that have allowed...Ch. 27.5 - explain why rapid population growth continues...Ch. 27.5 - Prob. 3CYLCh. 27.5 - Prob. 4CYLCh. 27 - Prob. 1MCCh. 27 - Prob. 2MCCh. 27 - Prob. 3MCCh. 27 - Prob. 4MCCh. 27 - Prob. 5MCCh. 27 - Prob. 1FIBCh. 27 - The type of growth that occurs in a population...Ch. 27 - Prob. 3FIBCh. 27 - The type of spatial distribution likely to occur...Ch. 27 - Prob. 5FIBCh. 27 - Prob. 1RQCh. 27 - Prob. 2RQCh. 27 - Draw, name, and describe the properties of a...Ch. 27 - Prob. 4RQCh. 27 - What is logistic population growth? What is K?Ch. 27 - Prob. 6RQCh. 27 - Distinguish between populations showing concave...Ch. 27 - Prob. 8RQCh. 27 - Prob. 9RQCh. 27 - Prob. 1ACCh. 27 - Prob. 2AC
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