You must have:
a ruler (cm/mm)
You can use:
an HB pencil
a scientific or graphical calculator
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 90.
• The marks for each question are shown in brackets [ ].
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
,2023 Turn over
, 2
1 (a) (i) Complete the table to compare cellular aerobic and anaerobic respiration in humans.
Tick (✓) the correct boxes in each row.
It requires It requires It produces It produces It produces
Process
glucose oxygen carbon dioxide water lactic acid
Aerobic
respiration
Anaerobic
respiration
[3]
(ii) Which statement about respiration is correct?
Tick (✓) one box.
Aerobic respiration produces more ATP than anaerobic respiration.
Anaerobic respiration produces more ATP than aerobic respiration.
Both aerobic and anaerobic respiration produce the same amount of ATP.
Neither aerobic or anaerobic respiration produces ATP.
[1]
(b) Heart muscle contains approximately 5000 mitochondria in every cell.
(i) Suggest why heart muscle cells need so many mitochondria.
(ii) The image shows the mitochondria in a section of heart muscle. The mitochondria are
different sizes.
One of the mitochondria is labelled.
A mitochondria
Estimate the number of mitochondria in this image.
Number of mitochondria =...........................................................[1]
2023
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