OCR GCSE Combined Science
Topic questions Human physiology Surface area to volume ratio
7 questions · 32 marks · about 35 minutes
Many large multicellular organisms have a mass transport system to supply all cells with their requirements.
The diagram shows a mammal’s heart.
Explain how the left ventricle is adapted to carry out its function.
Explain why small organisms like amoeba do not need a transport system.
Calculate the surface area to volume ratio of agar cube C.
Write your answer in the table.
The student has two results for their agar cube B experiment. The result for their first attempt was 122 seconds.
Suggest why the student repeated the experiment to obtain a second result.
* Tapeworms live in the digestive system of a host animal.
• They feed by absorbing nutrients directly from their animal host.
• The nutrients diffuse across the outer surface of the tapeworm to all the cells in their body.
• The tapeworm has a surface area to volume ratio similar to agar cube A.
Explain why having a surface area to volume ratio similar to agar cube A is an advantage to the tapeworm.
Use data from the table.
Calculate the surface area to volume ratio of agar cube C.
Write your answer in the table.
One of the times recorded is an anomaly.
Identify this anomalous result.
The anomaly was due to random error.
Suggest one random error that could have caused the anomaly.
Describe and explain the pattern in the results.
A student investigates the rate of diffusion using blocks of agar.
The diagram shows one of the blocks of agar they use.
The block has a surface area of 40 cm2.
What is the surface area to volume ratio of this block of agar?
A 1: 2
B 1: 2.5
C 2: 1
D 2.5: 1
Surface area is important for transport in plants.
Scientists investigate the relationship between surface area and volume.
Roots are important for transport in plants.
The diagram in Fig. 12.2 shows a root tip, with a root hair cell labelled.
The root hair cell is adapted for its function.
Explain why the adaptation is needed.
Look at the area of the root tip labelled X in Fig. 12.2.
Describe the type and function of the cells found in area X.
An elephant has a volume of 4.80 m3.
The surface area to volume ratio of the elephant is 3.84.
Calculate the surface area of this elephant.
A 0.80 m2
B 1.25 m2
C 8.64 m2
D 18.43 m2
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Combined Science starter pack