GCEBiology
AH420/02: Biological
diversityA Level
OXFORD
CAMBRIDGE
AND RSA
2024
OCR
, Oxford Cambridge and RSA
Friday 14 June 2024 – Morning
A Level Biology A
H420/02 Biological diversity
Time allowed: 2 hours 15 minutes
You can use:
• a scientific or graphical calculator
• a ruler (cm/mm)
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 begiven
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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 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 Biomass is transferred through ecosystems.
What process makes biomass available for transfer to the next trophic level in the food chain?
A Excretion
B Growth
C Removal of undigested food
D Respiration
Your answer [1]
2 What explains why food chains rarely have more than five trophic levels?
A Parts of the food organism are not eaten by organisms higher in the food chain.
B Plants absorb only a small proportion of the Sun’s energy.C
There is a limit to the size to which a predator can grow. D
Transfer of biomass between trophic levels is inefficient.
Your answer [1]
© OCR 2024
, 3
3 The rate at which plants produce biomass is known as productivity.
What is a suitable unit with which to measure productivity at different depths in the ocean?
A kg day–1 m–2 B
kg day–1 m–3 C kg
year–1 m2 D m kg–1
year –1
Your answer [1]
4 Microscopes vary in terms of magnification and resolution.
Which option describes the terms magnification and resolution?
A Magnification is the size of an image under a microscope and resolution is the sharpness ofthat
image.
B Magnification is the size of the image compared to the actual size and resolution is the abilityto
distinguish two objects from one another.
C Resolution is the ability to make small objects appear larger and magnification is the abilityto
distinguish two objects from one another.
D Resolution is the size of an image under a microscope and magnification is the sharpness ofthat
image.
Your answer [1]
© OCR 2024 Turn over
AH420/02: Biological
diversityA Level
OXFORD
CAMBRIDGE
AND RSA
2024
OCR
, Oxford Cambridge and RSA
Friday 14 June 2024 – Morning
A Level Biology A
H420/02 Biological diversity
Time allowed: 2 hours 15 minutes
You can use:
• a scientific or graphical calculator
• a ruler (cm/mm)
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 begiven
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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 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 Biomass is transferred through ecosystems.
What process makes biomass available for transfer to the next trophic level in the food chain?
A Excretion
B Growth
C Removal of undigested food
D Respiration
Your answer [1]
2 What explains why food chains rarely have more than five trophic levels?
A Parts of the food organism are not eaten by organisms higher in the food chain.
B Plants absorb only a small proportion of the Sun’s energy.C
There is a limit to the size to which a predator can grow. D
Transfer of biomass between trophic levels is inefficient.
Your answer [1]
© OCR 2024
, 3
3 The rate at which plants produce biomass is known as productivity.
What is a suitable unit with which to measure productivity at different depths in the ocean?
A kg day–1 m–2 B
kg day–1 m–3 C kg
year–1 m2 D m kg–1
year –1
Your answer [1]
4 Microscopes vary in terms of magnification and resolution.
Which option describes the terms magnification and resolution?
A Magnification is the size of an image under a microscope and resolution is the sharpness ofthat
image.
B Magnification is the size of the image compared to the actual size and resolution is the abilityto
distinguish two objects from one another.
C Resolution is the ability to make small objects appear larger and magnification is the abilityto
distinguish two objects from one another.
D Resolution is the size of an image under a microscope and magnification is the sharpness ofthat
image.
Your answer [1]
© OCR 2024 Turn over
