strategic invention materials population density
TRANSCRIPT
Population Density
A Strategic Intervention Material in Science 9 First Quarter 2017-2018
Prepared by: JOHN FLORENTINO E. ECHON, Science Teacher I
Presented to: LENIE N. ELAMPARO, Principal II Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
S9LT-Ie-f-30
Learning competenciesRelate species extinction to the failure of populations of organisms to adapt to abrupt changes in the environment
Specific objective:• Determine the pattern of population distribution using
mathematical formula• Compare the distribution patterns of the different populations.
GUIDE CARD
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Populations can be of the same size, but they may have different densities.
When we consider the number of individuals per unit area, we are referring to
the density of the population.
In formula,
Population Density = number of individuals
Size of the area
Differences in population density in any community may be attributed to many
factors. Population sizes change when new members move into the
ecosystem. They decrease when members move out of an ecosystem. The
birth rate and death rates can also affect a population’s size. Anything that
limits the size of a population like certain environmental conditions are called
limiting factors.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Limiting factors keep a population from increasing in size and help balance an
ecosystem. Examples of limiting factors are the availability of food, water, and
living conditions. Light, temperature and soil nutrients are also limiting factors
because they help determine the types of organisms that can live in an
ecosystem.
The maximum population size an environment can support is called its
carrying capacity. If the population size rises above the carrying capacity,
organisms die because they cannot meet all their needs.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
ACTIVITY
CARD
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Activity 1Measuring Population DensityObjective: Determine the pattern of population distribution using mathematical formula
Compare the distribution patterns of the different populations.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
1. Study the three patterns of
population distribution in Figure 4.
2. Using the given formula for
computing population density,
calculate the density of each
population.
Density = number of individuals
Size of area
3. Count the total number for
each population. Record the
number in the table.
4. On a sheet of paper, prepare a
table to record the data for
population density.
Table 1 Population Density
y
5. Calculate the density of each
population. Record it in the table.
Population name population Population density
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
ASSESSMENT
CARD
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
ENRICHMENT
CARD
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
I. Answer briefly the following questions in your answer sheet:
1. If the population species of a given area is doubled, what effect
would this have on the resources of the community?
2. In a population, limiting factors and population density are often
related. Suppose that the population density of plant seedlings in an
area is very high, explain how limiting factors may affect population
density.
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
ANSWER
CARD
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Populationname
population Populationdensity
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
REFERENCES
Tal
talN
atio
nal
Hig
h S
cho
ol
EC
HO
N, J
OH
N F
LO
RE
NT
INO
E.
Science 9 Learning Module
pp