PRINT TRANSCRIPT
OF BRAILLE PAPER
OCR
Oxford Cambridge and RSA
Friday 13 June 2025 - Morning
A Level Biology A
H420/02
Biological diversity
Time allowed: 2 hours 15 minutes plus your additional time allowance
You must have:
Answer paper
Diagram booklet
You can use:
A ruler (cm/mm)
A scientific or graphical calculator
INSTRUCTIONS
Write your name, centre number and candidate number at the top of your answer paper.
Write your answer to each question on your answer paper. 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.
H420_02_BETS_UEBG1_G2_QP_RP1_0625
1
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,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 (*).
ADVICE
Read each question carefully before you start your answer.
2
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, Section A
You should spend a maximum of 20 minutes plus your additional time allowance on this
section.
Write your answer to each question 1-15 as A, B, C or D.
1. Hydrogen bonds are important for the physical and chemical properties of water.
How do hydrogen bonds form in water?
A. Electronegative (δ–) oxygen atoms are attracted to the electropositive (δ+)
hydrogen atoms of adjacent water molecules.
B. Electronegative (δ–) oxygen atoms are attracted to the electropositive (δ+)
hydrogen atoms within the same water molecule.
C. Electropositive (δ+) oxygen atoms are attracted to the electronegative (δ–)
hydrogen atoms of adjacent water molecules.
D. Electropositive (δ+) oxygen atoms are attracted to the electronegative (δ–)
hydrogen atoms within the same water molecule.
[1 mark]
2. Water has many properties that are important for living organisms.
Which property of water molecules explains why small animals, such as pond skaters, are
able to move over the surface of water without sinking?
A. Adhesion
B. Buoyancy
C. Cohesion
D. Density
[1 mark]
3
for more: tyrionpapers.com
OF BRAILLE PAPER
OCR
Oxford Cambridge and RSA
Friday 13 June 2025 - Morning
A Level Biology A
H420/02
Biological diversity
Time allowed: 2 hours 15 minutes plus your additional time allowance
You must have:
Answer paper
Diagram booklet
You can use:
A ruler (cm/mm)
A scientific or graphical calculator
INSTRUCTIONS
Write your name, centre number and candidate number at the top of your answer paper.
Write your answer to each question on your answer paper. 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.
H420_02_BETS_UEBG1_G2_QP_RP1_0625
1
for more: tyrionpapers.com
,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 (*).
ADVICE
Read each question carefully before you start your answer.
2
for more: tyrionpapers.com
, Section A
You should spend a maximum of 20 minutes plus your additional time allowance on this
section.
Write your answer to each question 1-15 as A, B, C or D.
1. Hydrogen bonds are important for the physical and chemical properties of water.
How do hydrogen bonds form in water?
A. Electronegative (δ–) oxygen atoms are attracted to the electropositive (δ+)
hydrogen atoms of adjacent water molecules.
B. Electronegative (δ–) oxygen atoms are attracted to the electropositive (δ+)
hydrogen atoms within the same water molecule.
C. Electropositive (δ+) oxygen atoms are attracted to the electronegative (δ–)
hydrogen atoms of adjacent water molecules.
D. Electropositive (δ+) oxygen atoms are attracted to the electronegative (δ–)
hydrogen atoms within the same water molecule.
[1 mark]
2. Water has many properties that are important for living organisms.
Which property of water molecules explains why small animals, such as pond skaters, are
able to move over the surface of water without sinking?
A. Adhesion
B. Buoyancy
C. Cohesion
D. Density
[1 mark]
3
for more: tyrionpapers.com
