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AS Level Biology AH020/01 Breadth in biology Practice Question Paper 2022
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AS Level Biology AH020/01 Breadth in biology Practice Question Paper 2022
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AS Level Biology AH020/01 Breadth in biology
Practice Question Paper
Date – Morning/Afternoon
Time allowed: 1 hour 30 minutes
You must have:
Insert (inserted)
Ruler (cm/mm)
You may use:
a scientific calculator
* 0 0 0 0 0 0 *
First name
Last name
Centre Candidate
number number
INSTRUCTIONS
• Use black ink. You may use an HB pencil for graphs and diagrams.
• Complete the boxes above with your name, centre number and candidate number.
• Answer all the questions.
• Write your answer to each question in the space provided.
• Additional paper may be used if required but you must clearly show your candidate
number, centre number and question number(s).
• Do not write in the bar codes.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• This document consists of 24 pages.
© OCR 2015 H020/01
[…/…/…] DC (…) Turn over
, 2
SECTION A
You should spend a maximum of 25 minutes on this section.
You should put the letter of the correct answer in the box provided.
Answer all the questions.
1 Which inorganic ion can act as a cofactor for amylase?
A OH-
B PO43-
C Cl -
D HCO3-
Your answer [1]
2 Translocation occurs through the sieve elements by .................1................. . Sucrose is loaded
into the phloem at regions of the plant known as .............2................. . This mechanism is
..................3............... . The addition of sucrose ..............4.............. the water potential of the
sieve element sap. This causes water to enter from surrounding tissues by ............5........... which
in turn increases the .................6............... of the sap.
Which words correctly complete the numbered gaps 1-6?
1 2 3 4 5 6
A active transport sources active raises osmosis concentration
B mass flow sources active lowers active transport pressure
C mass flow sinks passive raises diffusion concentration
D mass flow sources active lowers osmosis pressure
Your answer [1]
© OCR 2015 H020/01
, 3
3 Fig. 2.1 shows the shapes of an enzyme molecule, its substrate and the molecules of three
substances, P, Q and R.
Each substance could bind either to the enzyme or to the substrate to cause an effect.
Enzyme Substrate P Q R
Fig. 2.1
Four tubes were set up:
The control contained enzyme and substrate only
Tube P contained enzyme, substrate and substance P
Tube Q contained enzyme, substrate and substance Q
Tube R contained enzyme, substrate and substance R.
Which option describes the most likely effect on the rate of reaction in each tube compared with
the control?
Tube P Tube Q Tube R
A increased no effect no effect
B decreased no effect decreased
C decreased no effect no effect
D decreased decreased no effect
Your answer [1]
4 After being mixed with iodine, which of the following would show a blue/black colour?
A potato tuber cells
B erythrocytes
C sieve tube elements
D neutrophils
Your answer [1]
© OCR 2015 H020/01
Turn over
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