Population Size Investigation of Daisies in School Field
Field investigations Required
Practical
Measure the population size of a common species in a habitat. Use sampling
techniques to investigate the effect of a factor on the distribution of this species.
Investigating the population size of daisies in trampled and un-trampled parts of a school
field
•
The size of a population of animals or plants in a habitat can be estimated by taking
samples of the organisms from the habitat. The larger the sample, the more accurate your
estimate of the population size is likely to be.
•
Plants can be sampled more easily than animals because they are unable to move around
within the habitat. By sampling, population sizes can be compared between different
areas.
•
You will compare the population sizes of daisies in trampled and un-trampled areas of your
school field. You will use a transect line and a quadrat to do this.
Field investigations Required
Practical
Measure the population size of a common species in a
habitat. Use sampling techniques to investigate the
effect of a factor on the distribution of this species
.
1.
Put the 30 m tape measure across a trampled area of the
school field to form a transect line.
2.
Put the 1 m
2
quadrat against the transect line. One corner of
the quadrat should touch the 0 m mark on the tape measure.
3.
Count the number of daisy plants within the quadrat.
4.
Record the number of daisies counted within the quadrat
5.
Move the quadrat 5 m up the transect line and count the
number of daisy plants again. Record in the table.
6.
Continue to place the quadrat at 5 m intervals and count the
number of daisy plants in
7.
each quadrat.
8.
Calculate the mean number of daisy plants per m
2
for the
trampled area.
9.
Move the 30 m tape measure to an un-trampled area of the
school field to form the new transect line.
10.
Repeat steps
2‒7
for the un-trampled transect line.
11.
Compare the population size of daisies in the trampled and
un-trampled areas of the field.
Reliability & Reproducibility
Measure the population size of a common species in
a habitat. Use sampling techniques to investigate the
effect of a factor on the distribution of this species
.
Reliability:
the degree to which
the result of a measurement,
calculation, or specification can be
depended on to be accurate.
Reproducibility
:
The ability of an
entire experiment or study to be
duplicated, either by the same
researcher or by someone else
working independently. Reproducing
an experiment is called replicating
it.
Task
1.
How do we know if results are
reliable?
2.
How do we know if results are
reproducible?
3.
How could we improve our
method to make it more reliable
& reproducible?
Required
Practical
Measure the population size of a common species in a habitat. Use sampling
techniques to investigate the effect of a factor on the distribution of this
species.
The size of a population
of animals or plants in a
habitat can be estimated
by taking samples of the
organisms from the
habitat. You will compare
the population sizes of
daisies in trampled and
un-trampled areas of
your school field. You
will use a transect line
and a quadrat to do this.
Aim
Control Variables
Dependant Variables
Independent Variables
Reliability
Accuracy
Example
Results
How to look at the results
•
Take 10 samples from each area
•
Average them out
•
Multiply by the total area
•
Compare results
Type of species
Size of quadrat
Number of
organisms in
sample
Type of area
If measurements are slightly
different from the others the results
are repeatable, meaning that each
time a measurement is taken it has
approximately the same value.
Accuracy tells you how
close your measurements
of the variable are to the
true value of the variable.
•
Repeat tests
•
Take an average
•
Discount anomalies
Enzymes
Required Practical
Measure the population size of a common species in
a habitat. Use sampling techniques to investigate the
effect of a factor on the distribution of this species
.
Things to remember when answering 6 mark exam questions:
1.
Try and remember everything you can about what the question is
asking before you start answering it
2.
Make at least 6 points
3.
Write in full sentences starting with capital letters and ending with
full stops
4.
Try and answer the question in around five minutes
5.
Check your answer to make sure you have not left anything out
6.
Remember to use key words when appropriate
This practical field investigation involves measuring the population size of daisies in both trampled and un-trampled areas of a school field. Using sampling techniques such as transect lines and quadrats, the study aims to compare the distribution of daisies in the different areas. Factors like reliability and reproducibility of results are discussed, highlighting the importance of accurate measurements for scientific investigations.
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Presentation Transcript
Field investigations Required Practical Measure the population size of a common species in a habitat. Use sampling techniques to investigate the effect of a factor on the distribution of this species. Investigating the population size of daisies in trampled and un-trampled parts of a school field The size of a population of animals or plants in a habitat can be estimated by taking samples of the organisms from the habitat. The larger the sample, the more accurate your estimate of the population size is likely to be. Plants can be sampled more easily than animals because they are unable to move around within the habitat. By sampling, population sizes can be compared between different areas. You will compare the population sizes of daisies in trampled and un-trampled areas of your school field. You will use a transect line and a quadrat to do this.
Field investigations Required Practical Measure the population size of a common species in a habitat. Use sampling techniques to investigate the effect of a factor on the distribution of this species . 1. Put the 30 m tape measure across a trampled area of the school field to form a transect line. 2. Put the 1 m2 quadrat against the transect line. One corner of the quadrat should touch the 0 m mark on the tape measure. 3. Count the number of daisy plants within the quadrat. 4. Record the number of daisies counted within the quadrat 5. Move the quadrat 5 m up the transect line and count the number of daisy plants again. Record in the table. 6. Continue to place the quadrat at 5 m intervals and count the number of daisy plants in 7. each quadrat. 8. Calculate the mean number of daisy plants per m2 for the trampled area. 9. Move the 30 m tape measure to an un-trampled area of the school field to form the new transect line. 10. Repeat steps 2 7 for the un-trampled transect line. 11. Compare the population size of daisies in the trampled and un-trampled areas of the field. Distance along the transect line in m Number of daisy plants per 1 m2 quadrat Trampled Un-trampled 0 5 10 15 20 25 30 Mean number of daisy plants per m2
Measure the population size of a common species in a habitat. Use sampling techniques to investigate the effect of a factor on the distribution of this species . Reliability & Reproducibility Reliability: the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. Task 1. How do we know if results are reliable? 2. How do we know if results are reproducible? 3. How could we improve our method to make it more reliable & reproducible? Reproducibility : The ability of an entire experiment or study to be duplicated, either by the same researcher or by someone else working independently. Reproducing an experiment is called replicating it.
Measure the population size of a common species in a habitat. Use sampling techniques to investigate the effect of a factor on the distribution of this species. Aim The size of a population of animals or plants in a habitat can be estimated by taking samples of the organisms habitat. You will compare the population sizes of daisies in trampled and un-trampled areas of your school field. You will use a transect line and a quadrat to do this. Example Results from the How to look at the results Take 10 samples from each area Average them out Multiply by the total area Compare results
Measure the population size of a common species in a habitat. Use sampling techniques to investigate the effect of a factor on the distribution of this species . Enzymes Required Practical Things to remember when answering 6 mark exam questions: 1.Try and remember everything you can about what the question is asking before you start answering it 2.Make at least 6 points 3.Write in full sentences starting with capital letters and ending with full stops 4.Try and answer the question in around five minutes 5.Check your answer to make sure you have not left anything out 6.Remember to use key words when appropriate
