Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Friday 11 October 2024
Morning (Time: 1 hour 30 minutes) Paper
reference WBI12/01
Biology
International Advanced Subsidiary/Advanced Level
UNIT 2: Cells, Development, Biodiversity and
Conservation
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
• Show all your working out in calculations and include units where appropriate.
Information
•• The total mark for this paper is 80.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Into questions labelled with an asterisk (*) marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
Turn over
P78385A
©2024 Pearson Education Ltd.
V:1/1/1/1/
*P78385A0136*
, Answer ALL questions.
Write your answers in the spaces provided.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Some questions must be answered with a cross in the box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
1 The diagram shows an incomplete plant cell, as drawn by a student.
(a) (i) Label the tonoplast on the diagram.
(1)
(ii) Draw and label a nucleolus in this plant cell.
(1)
(b) Complete the table to show which of these structures would be present or absent
in plant leaf cells.
(2)
if present
Structure
× if absent
amyloplast
chloroplast
Golgi apparatus
plasmodesmata
2
*P78385A0236*
, (c) The photograph shows a lysosome, as seen using an electron microscope.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
X Y
(Source: © Science History Images / Alamy Stock Photo)
Magnification ×250 000
Calculate the actual width (X–Y) of this lysosome in µm.
Give your answer to two decimal places.
(1)
Answer ................................................... . . . . . . . . . . . µm
(Total for Question 1 = 5 marks)
3
*P78385A0336* Turn over
, 2 Diatoms are single‑celled organisms important for many ocean food chains.
The photograph shows a diatom, as seen using a scanning electron microscope.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(Source: © AMI IMAGES / SCIENCE PHOTO LIBRARY)
(a) Diatoms contain a nucleus, mitochondria and chloroplasts.
(i) State the domain which contains diatoms.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(ii) The nucleus in a diatom contains DNA.
Name two processes that take place in the nucleus of a diatom.
(2)
1 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
2 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
4
*P78385A0436*
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Friday 11 October 2024
Morning (Time: 1 hour 30 minutes) Paper
reference WBI12/01
Biology
International Advanced Subsidiary/Advanced Level
UNIT 2: Cells, Development, Biodiversity and
Conservation
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
• Show all your working out in calculations and include units where appropriate.
Information
•• The total mark for this paper is 80.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Into questions labelled with an asterisk (*) marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
Turn over
P78385A
©2024 Pearson Education Ltd.
V:1/1/1/1/
*P78385A0136*
, Answer ALL questions.
Write your answers in the spaces provided.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Some questions must be answered with a cross in the box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
1 The diagram shows an incomplete plant cell, as drawn by a student.
(a) (i) Label the tonoplast on the diagram.
(1)
(ii) Draw and label a nucleolus in this plant cell.
(1)
(b) Complete the table to show which of these structures would be present or absent
in plant leaf cells.
(2)
if present
Structure
× if absent
amyloplast
chloroplast
Golgi apparatus
plasmodesmata
2
*P78385A0236*
, (c) The photograph shows a lysosome, as seen using an electron microscope.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
X Y
(Source: © Science History Images / Alamy Stock Photo)
Magnification ×250 000
Calculate the actual width (X–Y) of this lysosome in µm.
Give your answer to two decimal places.
(1)
Answer ................................................... . . . . . . . . . . . µm
(Total for Question 1 = 5 marks)
3
*P78385A0336* Turn over
, 2 Diatoms are single‑celled organisms important for many ocean food chains.
The photograph shows a diatom, as seen using a scanning electron microscope.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(Source: © AMI IMAGES / SCIENCE PHOTO LIBRARY)
(a) Diatoms contain a nucleus, mitochondria and chloroplasts.
(i) State the domain which contains diatoms.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(ii) The nucleus in a diatom contains DNA.
Name two processes that take place in the nucleus of a diatom.
(2)
1 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
2 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... .. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
4
*P78385A0436*
