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GCSE Biology ISA Section 2

Unit 3
by

Lee Cherry

on 26 March 2014

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Transcript of GCSE Biology ISA Section 2

The number of stomata on the upper surface of a leaf is always different from the lower surface
Biology ISA
Context
A gardener finds that some plant species grow well in wet soils and others grow better in dry soils.

On the exam paper you will need to:
analyse your own results
match you results to the hypothesis
evaluate the method
evaluation the quality of the results
analyase further secondary data
(case studies)
relate your findings to the context
Section 2
Analysing results

Section 2
Question
1


Question
2
Usually asks
you if your results support the hypothesis. Your answer should include the pattern and examples

Usually asks
if you have any anomalous (odd) results

Let's look at an example of each question using a specimen paper
on
transpiration

Remember,
you will have your research notes, your table of results and chart or graph
with you

Remember, to always quote examples from the data in your answer if you can-
quantitative


You should
give a more
detailed
explanation of
these case
studies
Always look
out for anomalous results and refer to them in your answer -
these make it difficult to come to a firm conclusions

There will be a question which asks you to evaluate some data
The other
two will either
have more detail or answer a different question
Usually, one
of the case
studies will link
directly with the
hypothesis
Next, you
are usually given
a new hypothesis and asked whether three
of the case studies support it
If the
dependent variable reaches a maximum
or minumum value
then it is a curve
This will
usually be a
straight line
or curve.
The first part usuall requires you to draw a sketch graph

Usually asks
you to analyse data from investigations similar to yours
These
investigations or
case studies
have an industrial
or commercial
context
The are
usually four case studies. The data is shown in some or all of simple tables, complex tables, line graphs and
bar charts

Question
3
This
question usually asks how your results relate
to the context.

Your will need to explain why plants from dry conditions have less stomata and vice versa

Why might
a gardener
find this
useful?

Usually asks
you about repeats and how this leads
to more accurate results.

If the independent variable is continuous
you may be asked about the range of values in the investigation

Usually asks
you about the errors and uncertainties in the investigation

Your answer
must include the pattern in your results and example data from your results

A mean can
be calculated. Remember to include how to calculate the
mean
Remember, anomalous results do not fit the pattern. Always give an example(s) from your results
Explain how the method will reduce or remove the source of error
Describe a
method that
will reduce or remove the
source of error
Describe a
source of
error in the investigation

Look out
for limitations in the method.

Refer to these in your
answer

Shown as a
result in a table
or graph that
does not fit the pattern
For example,
if only a few specimens were measured such as only a handful
of leaves
or as
range bars that
are too small or
too large compared to others in a
bar chart
Remember,
anomalous results should be ignored. They should not be included in calculations or when drawing a
line of best fit
If you have
not got any,
state you have not got any and explain how you know using examples from your results
Full transcript