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Title: GCSE Biology Exam 2 Practicals
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This covers the set practicals.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This covers the set practicals.
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Investigation into factors affecting the abundance and distribution of a species
Method
1
...
3
...
5
...
Roll two 20 sided dice to determine the coordinates
...
Count the number of daisy plants within the quadrat
...
Repeat steps 2-4 for at least 25 quadrats
...
biting and stinging insects
Risk
adverse skin response
Control measure
Cover skin at all times
...
Use insect repellent
...
•
•
•
•
Data for mown and unmown areas could be compared
...
It is important to use random sampling techniques in reducing/eliminating bias
...
28
Investigating into variation in organisms
Method
1
...
2
...
3
...
Analysis
1
...
2
...
Risk assessment
Hazard
•
•
Risk
Control measure
No significant risks are associated with this investigation
...
In reality, some snails may have better camouflage than others, which may affect sample
size
...
Ask your first volunteer to sit in the chair with good upright posture and eyes looking
across the room
...
Have the volunteer place their forearm (the part of the arm from elbow to hand) so it
extends over the edge of the table
...
Ask the volunteer to place their thumb and index (pointer) finger on either side of the
bottom of the vertically placed ruler
...
4
...
5
...
6
...
Their job will be to
catch it with their thumb and forefinger as soon as they sense it dropping
...
Drop the ruler
...
The lower the number, the faster the reaction time
...
Conduct five trials with the same volunteer, dropping the ruler from 2 cm above their
fingers each time
...
Repeat the experiment with at least five other volunteers and record your results in a
suitable table
...
Use a conversion table to convert the distance measured to a reaction time for each
volunteer
...
Discuss the extent to which your results support the hypothesis
...
1
...
30
Test artificial urine samples for the presence of protein and glucose
Method (for glucose)
1
...
3
...
Using a 10 cm3 measuring cylinder, add 5 cm3 of Sample A into a test tube
...
Observe and record any colour change
...
Method (for glucose)
1
...
3
...
5
...
Using a syringe, add 2 cm3 of Biuret solution
...
Observe and record any colour change
...
Analysis
1
...
Risk assessment
Hazard
Biuret solution is an irritant
...
Risk
Biuret could get on to the
skin when putting into the
test tube
...
scalding of skin
31
Control measure
Wash hands immediately if
amylase gets on to them
...
Wear eye protection
...
Investigation of the effect of antibiotics on bacterial growth
Method
1
...
Wipe down the working area thoroughly
with the disinfectant
...
Work very close to a lit Bunsen burner
...
3
...
4
...
5
...
6
...
Divide the base into four sections by drawing a cross with
the marker pen
...
7
...
Raise the lid of the
Petri dish at an angle and place the disc onto the agar in the centre of section A
...
Repeat step 5 for the other 3 discs
...
9
...
Tape the lid securely
...
10
...
11
...
Analysis
1
...
Risk assessment
Hazard
Bacteria can be pathogenic
...
burning skin when placing
discs on plate
32
Control measure
Wash hands
...
Seal plate so that it is not
opened
...
Do not touch tip of forceps
after flaming
Title: GCSE Biology Exam 2 Practicals
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This covers the set practicals.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This covers the set practicals.