O-LevelBiologyCoordination & Response5090/21 · May/June 2015 · Q18 Marks
Fig. 1.1 shows a vertical section through the skin in two different environmental conditions, A and B. skin in environmental condition A skin in environmental condition B [Figure 1.1]
- (a)On Fig. 1.1, label each of the following: • a sweat gland • a capillary.[2]
- (b)Use the information in Fig. 1.1 to suggest how environmental condition B is different from environmental condition A.[1]
- (c)(i)State two differences between the skin in environmental condition A and the skin in environmental condition B. 1 2[2]
- (c)(ii)Explain the advantages to a person in environmental condition B of the two differences you have stated in your answer to (c)(i).[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.
- [2] sweat gland labelled ; R sweat duct
- [2] capillary labelled ;
- [1] warmer ; must be a comparative statement
- [max 2] sweat (present in B/ORA) ;
- [max 2] capillaries carry more blood (in B/ORA) ;
- [max 2] capillaries wider / dilated (in B/ORA) ; Ig constrict/shrink
- [max 3] evaporation (of sweat) ;
- [max 3] more blood near (surface of) skin ;
- [max 3] increased heat loss / cooling;
- [max 3] allows regulation of temperature / prevents overheating;
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