Pearson Edexcel AS/ A-Level Biology UNIT 2: Cells, Development, Biodiversity and Conservation January 2024 Authentic Marking Scheme Attached

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Pearson Edexcel International Advanced Level
Monday 15 January 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.

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


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, Answer ALL questions.

Write your answers in the space provided.




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Some questions must be answered with a cross in a 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 Plants contain tissues involved in the transport of substances.
The diagram shows a sunflower plant.




height of
sunflower plant

height of
person = 1.6 m




(a) Estimate the height of the sunflower, using the information in the diagram.
Give your answer with appropriate units.
(1)




Answer ......................... ............... . . . . . . . . . . . . . . . . . . . . . .




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, (b) The photograph shows a structure that would be found in a sunflower plant.
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structure X




(Source: © Dr. Richard Kessel and Dr. Gene Shih / Science Photo Library)

(i) Name the tissue that would contain structure X.
(1)

. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... ............... . . . . . . . . . . . . . . . . . . . . .



(ii) Describe how two structures in this tissue enable it to carry out its function.
(2)

Structure 1 .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. . . . . . . . . . . . . . . . . . . . . . .



. . . . . . . . . . . . .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ............... . . . . . . . . . . . . . . . . . . . . .



Structure 2 .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ .............. . . . . . . . . . . . . . . . . . . . . . .



. . . . . . . . . . . . .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ............... . . . . . . . . . . . . . . . . . . . . .




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, (c) The photograph shows some rings of lignin, as seen using a microscope.




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(Source: © Science Photo Library / Alamy Stock Photo)

(i) Which of the following tissues contain lignin?
1. phloem
2. sclerenchyma
3. xylem
(1)
A 1 only

B 1 and 3 only
C 2 and 3 only

D 3 only




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