Thursday 21 May 2026 – Morning
AS Level Biology A
H020/02 Depth in biology
Time allowed: 1 hour 30 minutes
You can use:
*
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 0 2 0 0 2 *
*
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 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
Cambridge OCR 2026 [601/4261/3] Cambridge OCR is an exempt Charity
DC (SL/TC) 363156/6 Turn over
, 2
1
(a) The table lists features of cells.
Complete the table with one tick (✓) in each row to identify if the feature is found in a guard cell,
a typical animal cell or both.
Feature Guard Cell Typical animal cell Both
Cellulose cell wall present
Plasma membrane present
Ribosomes present
Chloroplasts present
[4]
(b) A student uses a light microscope to study guard cells and stomata.
This is the image they see.
Cell X
× 600
Cambridge OCR 2026
, 3
(i) State two ways the image would be different if it was taken with a scanning electron
microscope (SEM).
1 .......................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
[2]
(ii) The actual length of cell X is 190 μm.
Calculate how long the cell would appear when viewed using a light microscope with a
magnification of ×600.
Give your answer in mm.
Magnified cell length = .................................................. mm [2]
State a source of plant stem cells.
..................................................................................................................................................... [1]
Cambridge OCR 2026 Turn over
AS Level Biology A
H020/02 Depth in biology
Time allowed: 1 hour 30 minutes
You can use:
*
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 0 2 0 0 2 *
*
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 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
Cambridge OCR 2026 [601/4261/3] Cambridge OCR is an exempt Charity
DC (SL/TC) 363156/6 Turn over
, 2
1
(a) The table lists features of cells.
Complete the table with one tick (✓) in each row to identify if the feature is found in a guard cell,
a typical animal cell or both.
Feature Guard Cell Typical animal cell Both
Cellulose cell wall present
Plasma membrane present
Ribosomes present
Chloroplasts present
[4]
(b) A student uses a light microscope to study guard cells and stomata.
This is the image they see.
Cell X
× 600
Cambridge OCR 2026
, 3
(i) State two ways the image would be different if it was taken with a scanning electron
microscope (SEM).
1 .......................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
[2]
(ii) The actual length of cell X is 190 μm.
Calculate how long the cell would appear when viewed using a light microscope with a
magnification of ×600.
Give your answer in mm.
Magnified cell length = .................................................. mm [2]
State a source of plant stem cells.
..................................................................................................................................................... [1]
Cambridge OCR 2026 Turn over
