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5.0
AQA A LEVEL RESPIRATION EXAM QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Q: Suggest the advantages of the change in blood flow in blood
vessels during exercise. [3 marks]
Ans: -more blood flow to muscles during exercise
-supplying more glucose and oxygen/ removing carbon dioxide/ lactic
acid/ heat
-for high rate of respiration/ to meet increased demand for energy
Q: Explain how microorganisms contributed to the increase in
temperature during processing of organic waste. [2 marks]
Ans: respiration produces heat
Q: explain the advantage of showing the data using standard
deviations rather than ranges. [2 marks]
Ans: SD is spread of data around the mean
SD reduces the effect of anomalies
SD can be used to determine if difference in results is significant. not
significant/ due to chance/ not due to chance
,Q: aerobic respiration produces more ATP per molecule of glucose
than aerobic respiration. Explain why. [2 marks]
Ans: oxygen is terminal electron acceptor/ oxygen combines with electrons
and protons
aerobic respiration oxidative phosphorylation
anaerobic respiration only glycolysis occurs
Q: ...After a number of days, this injection of antigen resulted in the
myelin sheaths in the mice being damaged. some cell bodies of
neurones were also damaged. Suggest how the injection of the
antigen resulted in the myelin sheaths being damaged. [3 marks]
Ans: antigen stimulated immune response
antibodies produced/ B/T cells divide
antibodies attach myelin sheath
Q: Suggest why having a large number of mitochondria with this
unusual ultrastructure could lead to neurone dying. [3 marks]
Ans: fewer Cristae
so less oxidative phosphorylation
so not enough ATP produced to keep neurones alive
Examstudy - Stuvia US
, Q: ...For the first 10 minutes, the tap attached to the tube A was left
open and the syringe from tube B was removed. Suggest three reasons
why the apparatus was left for 10 minutes. [3 marks]
Ans: 1. equilibrium reached
2. allow for pressure change in apparatus
3. allow respiration rate of seeds to stabilise
Q: //
suggest and explain why the chosen temperature was 20C for this
experiment. 2 marks
Ans: optimum temperature for normal growth of seeds
optimum temperature for enzymes involved in respiration
Q: during the experiment, the coloured liquid in the tubing moved
towards tube B. explain what caused this. [3 marks]
Ans: oxygen taken up/ used by seeds
CO2 given out is absorbed by KOH
so pressure in B decreases
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
AQA A LEVEL RESPIRATION EXAM QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Q: Suggest the advantages of the change in blood flow in blood
vessels during exercise. [3 marks]
Ans: -more blood flow to muscles during exercise
-supplying more glucose and oxygen/ removing carbon dioxide/ lactic
acid/ heat
-for high rate of respiration/ to meet increased demand for energy
Q: Explain how microorganisms contributed to the increase in
temperature during processing of organic waste. [2 marks]
Ans: respiration produces heat
Q: explain the advantage of showing the data using standard
deviations rather than ranges. [2 marks]
Ans: SD is spread of data around the mean
SD reduces the effect of anomalies
SD can be used to determine if difference in results is significant. not
significant/ due to chance/ not due to chance
,Q: aerobic respiration produces more ATP per molecule of glucose
than aerobic respiration. Explain why. [2 marks]
Ans: oxygen is terminal electron acceptor/ oxygen combines with electrons
and protons
aerobic respiration oxidative phosphorylation
anaerobic respiration only glycolysis occurs
Q: ...After a number of days, this injection of antigen resulted in the
myelin sheaths in the mice being damaged. some cell bodies of
neurones were also damaged. Suggest how the injection of the
antigen resulted in the myelin sheaths being damaged. [3 marks]
Ans: antigen stimulated immune response
antibodies produced/ B/T cells divide
antibodies attach myelin sheath
Q: Suggest why having a large number of mitochondria with this
unusual ultrastructure could lead to neurone dying. [3 marks]
Ans: fewer Cristae
so less oxidative phosphorylation
so not enough ATP produced to keep neurones alive
Examstudy - Stuvia US
, Q: ...For the first 10 minutes, the tap attached to the tube A was left
open and the syringe from tube B was removed. Suggest three reasons
why the apparatus was left for 10 minutes. [3 marks]
Ans: 1. equilibrium reached
2. allow for pressure change in apparatus
3. allow respiration rate of seeds to stabilise
Q: //
suggest and explain why the chosen temperature was 20C for this
experiment. 2 marks
Ans: optimum temperature for normal growth of seeds
optimum temperature for enzymes involved in respiration
Q: during the experiment, the coloured liquid in the tubing moved
towards tube B. explain what caused this. [3 marks]
Ans: oxygen taken up/ used by seeds
CO2 given out is absorbed by KOH
so pressure in B decreases
Examstudy - Stuvia US
