ACTUAL JUNE 2024 PEARSON EDEXCEL LEVEL 3 GCE BIOLOGY B 9BIO/02 PAPER 2 MERGED QUESTION PAPER AND MARKING SCHEME 100% GUARANTEE

ACTUAL JUNE 2024 PEARSON EDEXCEL LEVEL 3 GCE BIOLOGY B 9BIO/02 PAPER 2 MERGED QUESTION
PAPER AND MARKING SCHEME 100% GUARANTEE
surname names


Number Number




Morning (Time: 1 hour 45 minutes) Paper


B ■ ■


Advanced
PAPER 2: Advanced Physiology, Evolution and Ecology




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.

Information

•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Instructure
question(s) marked with an asterisk (*), marks will be awarded for your ability to
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.
• your answers if you have time at the end.
Check

Turn over


P78664A
©2024 Pearson Education Ltd.
F:1/1/1/1/1/1/

, Answer ALL questions.

Some questions must be answered with a cross in a box . If you change your mind about an




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answer, put a line through the box and then mark your new answer with a cross .
1 The photograph shows part of a root tip cell, as seen with an electron microscope.




P
Q


X Y
S




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R



(Source: © BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY)

(a) (i) Which of the following structures is surrounded by a tonoplast?
(1)
A P

B Q

C R
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D S


(ii) In which of the following structures does the process of translation occur?
(1)
A P

B Q

C R

D S



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, (iii) How many of the labelled structures in this cell will be present in a cell of an
organism in the domain Archaea?
(1)
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A 0

B 1

C 2

D 3


(b) The width of structure P, measured between X and Y, is 36 μm.
Calculate the magnification of this photograph.
Give your answer in standard form.
(2)
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Answer ..............................................................
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, (c) Some plants have adaptations that prevent them being eaten by animals.

Sorghum is a plant that stores a substance called dhurrin inside leaf cells in the




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structures labelled S in the photograph.

Dhurrin is broken down by the enzyme glucosidase to release hydrogen cyanide.
Glucosidase is stored within the chloroplasts of leaf cells.

Hydrogen cyanide inhibits aerobic respiration.

Explain why dhurrin is stored within structure S, and glucosidase is stored
separately in the chloroplasts.
(2)

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(Total for Question 1 = 7 marks)




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