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OCR-A-level-Biological-Processes-Nov-2020-QP
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Oxford Cambridge and RSAMonday 12 October 2020 – Morning
A Level Biology A
H420/01 Biological processes
Time allowed: 2 hours 15 minutes
*8242704517*
You can use:
•a scientific or graphical calculator
•a ruler (cm/mm)
*H42001*
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 100.
• 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 36 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2020 [601/4260/1] DC (ST/CT) 190542/8
OCR is an exempt Charity
Turn over
, 2
© OCR 2020
, 3
SECTION A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
Answer all the questions.
1 Which of the following statements, A to D, about differential staining is not true?
A Differential staining can distinguish between different organelles.
B Differential staining can distinguish between types of cell.
C Differential staining can distinguish between types of organism.
D Differential staining is a common feature of electron microscopy.
Your answer
2 Which of the following statements, A to D, about microscopes is correct?
A A light microscope with an eyepiece lens magnification of × 10 and an
objective lens magnification of × 50 will have an overall magnification of × 60.
B Scanning electron microscopes and laser scanning confocal microscopes can
both produce three dimensional images.
C The maximum resolution of a scanning electron microscope is lower than that
of a light microscope.
D Transmission electron microscopes and laser scanning confocal microscopes
can both produce three dimensional images.
Your answer [1] 3 The figure below shows a drawing of a light microscope
image. The image is a cross-section taken from the stem of a dicotyledonous plant.
© OCR 2020 Turn over
, 4
F
E
G
Which of the rows, A to D, correctly identifies the name of the tissue labelled E and the
functions of tissue F and tissue G?
Name of tissue E Function of tissue F Function of tissue G
A cambium transport of assimilates transport of water
B cambium transport of water transport of assimilates
C palisade cells transport of assimilates transport of water
D palisade cells transport of water transport of assimilates
Your answer
4 Which of the following statements, A to D, does not correctly describe the structure or
formation of plant vascular tissues?
A Companion cells are linked to xylem vessels by plasmodesmata.
B Mature sieve tube elements do not contain nuclei.
C Phloem and xylem are formed by differentiation of vascular meristems.
D Xylem vessels have non-lignified pits to allow movement in and out.
Your answer [1] 5 Large multicellular animals need a transport system
for oxygen and carbon dioxide.
Large multicellular plants do not need a transport system for oxygen and carbon dioxide.
Which of the following statements, A to D, correctly explains these observations?
© OCR 2020
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