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
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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.
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