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Title: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged
Description: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged COMBINED SCIENCE A Oxford Cambridge and RSA Friday 7 June 2024 – Afternoon GCSE (9–1) Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) Time allowed: 1 hour 10 minutes You must have: H • a ruler (cm/mm) You can use: • a scientific or graphical calculator • an HB pencil * J 2 5 0 0 8 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 60. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. 2 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Gardeners are changing the way they care for their garden. Which change would increase biodiversity? A Adding chemical fertilisers to a grass lawn B Cutting a grass lawn more often than usual C Removing a grass lawn area and putting down paving stones D Replacing a grass lawn area with a wild flower meadow Your answer [1] 2 Which row is a correct comparison of meiosis and mitosis? Involves cell Halves the number Requires DNA division of chromosomes replication A both meiosis only both B both both both C meiosis only both mitosis only D mitosis only meiosis only mitosis only Your answer
Description: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged COMBINED SCIENCE A Oxford Cambridge and RSA Friday 7 June 2024 – Afternoon GCSE (9–1) Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) Time allowed: 1 hour 10 minutes You must have: H • a ruler (cm/mm) You can use: • a scientific or graphical calculator • an HB pencil * J 2 5 0 0 8 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 60. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. 2 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Gardeners are changing the way they care for their garden. Which change would increase biodiversity? A Adding chemical fertilisers to a grass lawn B Cutting a grass lawn more often than usual C Removing a grass lawn area and putting down paving stones D Replacing a grass lawn area with a wild flower meadow Your answer [1] 2 Which row is a correct comparison of meiosis and mitosis? Involves cell Halves the number Requires DNA division of chromosomes replication A both meiosis only both B both both both C meiosis only both mitosis only D mitosis only meiosis only mitosis only Your answer
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COMBINED SCIENCE A
OCR 2024
GCSE Combined Science A
(Gateway Science)
J250/08 Biology (Higher Tier)
With Marking Scheme Merged
Oxford Cambridge and RSA
Friday 7 June 2024 – Afternoon
GCSE (9–1) Combined Science A
(Gateway Science)
J250/08 Biology (Higher Tier)
Time allowed: 1 hour 10 minutes
H
You must have:
• a ruler (cm/mm)
You can use:
• a scientific or graphical calculator
• an HB pencil
*
J
2
5
0
0
8
*
Please write clearly in black ink
...
Centre number
Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink
...
• Write your answer to each question in the space provided
...
The question numbers must be clearly shown
...
• Where appropriate, your answer should be supported with working
...
INFORMATION
• The total mark for this paper is 60
...
• Quality of extended response will be assessed in questions marked with an asterisk (*)
...
ADVICE
• Read each question carefully before you start your answer
...
Write your answer to each question in the box provided
...
Which change would increase biodiversity?
A Adding chemical fertilisers to a grass lawn B
Cutting a grass lawn more often than usual
C Removing a grass lawn area and putting down paving stones D
Replacing a grass lawn area with a wild flower meadow
Your answer
2
[1]
Which row is a correct comparison of meiosis and mitosis?
Involves cell
division
Halves the number
of chromosomes
Requires DNA
replication
A
both
meiosis only
both
B
both
both
both
C
meiosis only
both
mitosis only
D
mitosis only
meiosis only
mitosis only
Your answer
© OCR 2024
[1]
3
3
Which statement describes a difference between red blood cells and white blood cells?
A Red blood cells contain enzymes
...
C
White blood cells contain proteins
...
Your answer
4
[1]
Which disease may develop due to an interaction with HPV?
A AIDS
B Cervical cancer C
Tuberculosis D Type
2 diabetes
Your answer
5
[1]
Why does a plant scientist use antibodies specific to a type of antigen?
A To develop new plants using selective breeding
B To find new species of plants growing around the world
C To identify communicable diseases in plants
D To study the evolution of plants
Your answer
© OCR 2024
[1]
Turn over
4
6
Which row shows the correct order of some processes in the water cycle?
A
Condensation
evaporation
precipitation
condensation
B
Condensation
precipitation
evaporation
condensation
C
Precipitation
condensation
evaporation
precipitation
D
Precipitation
evaporation
condensation
evaporation
Your answer
7
[1]
The diagram shows a phylogenetic tree for a group of related
animals
...
B
Animal X is a common ancestor to all the hyenas
...
D
The closest relation to the striped hyena is the spotted hyena
...
Pathogen growing
on agar plate
Clear zone where
pathogen does not
grow
Paper disc
containing
new drug
The area of the clear zone is used to indicate the effectiveness of the drug
...
4 cm
...
14
A
2
37
...
36 mm
C
2
452
...
64 mm
2
Your answer
9
[1]
Which row shows how a high cholesterol diet is linked to cardiovascular disease?
Coronary vessel blocked
by cholesterol
Gas unable to be transported
to cardiac muscle, damaging
the heart
A
artery
carbon dioxide
B
artery
oxygen
C
vein
carbon dioxide
D
vein
oxygen
Your answer
© OCR 2024
[1]
Turn over
6
10
To function correctly, the brain needs to make a chemical called dopamine
...
Embryonic stem cells might be used to treat Parkinson’s disease
...
B The embryonic stem cells may not produce the correct type of dopamine
...
D
The embryonic stem cells will not have the same genome as the patient
...
(a) In an investigation, scientists estimated the population of flying insects in a forest
...
The mass of insects collected each month is then recorded
...
The table shows their results
...
Both years should be included on the same grid
...
May
June
July
Month
Aug
Sept
[4]
© OCR 2024
9
(ii) What two conclusions can be made about the mass of flying insects in 1995 compared to 2015?
1
...
2
...
[2]
(iii) How can the scientists’ method be developed to investigate biodiversity in the
forest? Tick (3) one box
...
Record the number of different species found in the nets
...
Use their data to calculate mean mass for each year
...
The scientists trap insects using a pitfall trap
...
For each estimate they use this method:
•
•
•
•
Place pitfall traps in different areas of the forest
...
Mark the insects
...
A week later they trap a second sample of insects
...
State one other precaution that they should take when deciding how to mark the insects
...
...
This table shows the results
of this investigation
...
Use the formula to estimate the population size of insects in 2015
...
Estimated population of insects =
...
The population of insects living on the forest ground increased between 1995 and 2015
...
True
False
Both investigations came to the same conclusion about
changes in insect population
...
Only one investigation shows how the insect population
changes with each month
...
[2]
© OCR 2024
11
BLANK PAGE
PLEASE DO NOT WRITE ON THIS PAGE
© OCR 2024
Turn over
12
12 Genetic material is required for inheritance in eukaryotic and prokaryotic cells
...
...
...
[2]
(b) Peas develop inside pods
...
The allele for green is dominant over the allele for
yellow
...
Complete the table
...
homozygous dominant
Gg
...
[2]
© OCR 2024
13
(ii) A gardener crosses a plant that has green pods with a plant that has yellow
pods
...
The result is 15 new plants with green pods and 3 plants with yellow pods
...
Use letters G and g for the alleles
...
If the green plant does not have a homozygous genotype:
yellow pods
green pods
Offspring ratio
...
Suggest why this does not match either of the offspring ratios
...
...
(a) Describe how powdery mildew is spread from one plant to another
...
...
[2]
(b) Powdery mildew reduces the efficiency of chloroplasts
...
...
...
...
(i)
Complete the sentences about genetic engineering
...
enzyme
...
enzyme
...
...
[3]
(ii) Explain why the process of cutting the DNA is prevented by high
temperatures
...
...
...
[2]
(d) Powdery mildew can be controlled using chemicals
...
Suggest two reasons why
...
...
...
(a) Two students investigate the moisture content of different
soils
...
Place the soil samples in a warm oven to dry for 4 hours
...
The table shows their results
...
1
97
...
0
B
154
...
5
18
...
3
121
...
Calculate the percentage change in mass of soil sample C
...
Write your answer in the table
...
Why is the percentage change in mass greater for soil sample A?
...
•
•
Student Y used a similar method but left the soil in the oven for a different length of time
...
Explain why student Y found the moisture content of soil sample C to be higher than student X
...
...
...
...
The amount of microorganisms in the soil can also affect plant growth
...
...
...
...
...
They evolved from a much smaller pigeon that flew to the island
...
There were originally no predators or humans on Mauritius
...
Humans arrived on the island in 1598
...
The dodo became extinct by 1700
...
...
...
...
...
...
...
[6]
(b) Suggest one way scientists could find evidence that the pigeon and the dodo have a common
ancestor
...
...
You must write the question numbers clearly
in the margin
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
OCR qualifications include
AS/A Levels, Diplomas, GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills,
Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT,
business, languages, teaching/training, administration and secretarial skills
...
OCR is a not-for-profit organisation; any surplus made
is invested back into the establishment to help towards the development of qualifications and
support, which keep pace with the changing needs of today’s society
...
It shows the basis on which marks were awarded by examiners
...
All examiners are instructed that alternative correct answers and unexpected approaches
in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and
skills demonstrated
...
© OCR 2024
Oxford Cambridge and RSA Examinations
J250/08
Mark Scheme
June 2024
MARKING INSTRUCTIONS
PREPARATION FOR MARKING
RM ASSESSOR
1
...
2
...
These are available in RM A ssessor
...
Log-in to RM Assessor and mark the required number of practice responses (“scripts”) and the required number of standardisation
responses
...
Mark strictly to the mark scheme
...
Marks awarded must relate directly to the marking criteria
...
The schedule of dates is very important
...
If you experience problems, you must contact your Team Leader (Supervisor) without delay
...
If you are in any doubt about applying the mark scheme, consult your Team Leader by telephone, email or via the RM Assessor messaging
system
ALLOW all green / 1:0 / 18:0
ALLOW 0:1 / 0:18 / 0:4 unless colours incorrectly
stated
ALLOW ECF from their genetic cross
IGNORE percentages
Answer is dependent on second genetic cross
✓
ALLOW 2:2 / 9:9 / 50:50
ALLOW ECF from their genetic cross
IGNORE percentages
Not homozygous genotype offspring ratio = 1 : 1
(iii) Sample size too small
Guidance
✓
1
14
2
...
1
NOTE the idea of ‘less’ or ‘reduced’ must be seen
once in the answer to gain 3 marks
3
Reduces the rate of photosynthesis
✓
Photosynthesis produces (less) oxygen/glucose
Idea that glucose is needed for respiration
(i)
Ligase
2
...
1
ALLOW no glucose produced
ALLOW correct word or symbol equation for
photosynthesis
DO NOT ALLOW less carbon dioxide is produced
1
...
g
...
1
DO NOT ALLOW lipase
ALLOW marker gene
ALLOW idea of using antibiotics to see if they
affect bacteria, those unaffected contain the gene
15
J250/08
Mark Scheme
Question
(ii)
AO
Marks element
Answer
Any two from:
Enzyme denatures
June 2024
2
2 x 1
...
1
ALLOW ORA
ALLOW named pollinator
IGNORE reference to humans
Idea that chemicals may reduce food source for animals
ALLOW prevents bioaccumulation / description of
higher in food chain
bioaccumulation
IGNORE ideas about cost
IGNORE ideas that plants may develop resistance
16
J250/08
Mark Scheme
Question
Answer
14 (a) (i) First check the answer in table or answer space
If answer = 3
...
0 x 100
126
...
1
Guidance
ALLOW 121
...
3 x 100
126
...
3 -121
...
3
= 3
...
2
= 3
...
e
...
3
or 247
...
95882…
...
12
IGNORE % sign in the body of the table
1
3
...
1b
Assume answers refer to Y unless X stated
1
3
...
1
ALLOW de
Title: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged
Description: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged COMBINED SCIENCE A Oxford Cambridge and RSA Friday 7 June 2024 – Afternoon GCSE (9–1) Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) Time allowed: 1 hour 10 minutes You must have: H • a ruler (cm/mm) You can use: • a scientific or graphical calculator • an HB pencil * J 2 5 0 0 8 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 60. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. 2 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Gardeners are changing the way they care for their garden. Which change would increase biodiversity? A Adding chemical fertilisers to a grass lawn B Cutting a grass lawn more often than usual C Removing a grass lawn area and putting down paving stones D Replacing a grass lawn area with a wild flower meadow Your answer [1] 2 Which row is a correct comparison of meiosis and mitosis? Involves cell Halves the number Requires DNA division of chromosomes replication A both meiosis only both B both both both C meiosis only both mitosis only D mitosis only meiosis only mitosis only Your answer
Description: OCR 2024 GCSE Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) With Marking Scheme Merged COMBINED SCIENCE A Oxford Cambridge and RSA Friday 7 June 2024 – Afternoon GCSE (9–1) Combined Science A (Gateway Science) J250/08 Biology (Higher Tier) Time allowed: 1 hour 10 minutes You must have: H • a ruler (cm/mm) You can use: • a scientific or graphical calculator • an HB pencil * J 2 5 0 0 8 * Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name INSTRUCTIONS Candidate number • 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 60. • 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 20 pages. ADVICE • Read each question carefully before you start your answer. 2 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Gardeners are changing the way they care for their garden. Which change would increase biodiversity? A Adding chemical fertilisers to a grass lawn B Cutting a grass lawn more often than usual C Removing a grass lawn area and putting down paving stones D Replacing a grass lawn area with a wild flower meadow Your answer [1] 2 Which row is a correct comparison of meiosis and mitosis? Involves cell Halves the number Requires DNA division of chromosomes replication A both meiosis only both B both both both C meiosis only both mitosis only D mitosis only meiosis only mitosis only Your answer