Exam (elaborations)
Alevel biology practical questions mix
- Module
- Alevel biology
- Institution
- Alevel Biology
A mix of question to revise for aqa practicals
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Practical Skills, Apparatus and Technique BookletWithin the booklet you have:
1. The apparatus and techniques table for AQA A level. This shows all the apparatus or
techniques that they could ask you about within the exam.
2. The required practicals list of AQA. This also shows you which apparatus and techniques link
to each required practical and therefore what could be assessed in the exam for the
practicals.
3. 124 marks worth of past paper practical techniques questions
4. The mark scheme for the exam questions
Page 1 of 49
, Name: ________________________
Practical Technique Exam
Questions
Class: ________________________
Date: ________________________
Time: 154 minutes
Marks: 124 marks
Comments:
Page 2 of 49
,Q1.
Yeast cells can respire aerobically or anaerobically. A student used the apparatus shown
in Figure 1 to measure the rate of respiration in yeast.
She:
• positioned the flask in a water bath so that the yeast culture reached a constant
temperature
• then left the apparatus for one hour before starting her investigation.
Figure 1
(a) Suggest one reason why it was important that the student left the apparatus for one
hour after the yeast culture reached a constant temperature.
___________________________________________________________________
___________________________________________________________________
(1)
(b) During her investigation, the coloured liquid moved to the right.
Explain why it moved to the right.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
Page 3 of 49
, ___________________________________________________________________
(2)
(c) The student found that the coloured liquid moved 1.5 cm in 24 hours. The diameter
of the lumen (hole) of the capillary tubing was 1 mm.
The volume of a capillary tubing is given by πr2l, where π is 3.14 and l = length.
Calculate the volume of gas produced in cm3 hour–1.
Show your working.
Answer = ____________________ cm3 hour–1
(2)
Figure 2 shows a typical population growth curve for yeast under laboratory conditions.
Figure 2
(d) Explain why a log scale is used to record the number of cells.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
(1)
(e) Many yeast cells die during the death phase.
Suggest one reason why.
___________________________________________________________________
Page 4 of 49
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