O-LevelBiologyCoordination & Response5090/22 · Oct/Nov 2017 · Q29 Marks
Fig. 2.1 shows changes in the body temperature of a person. [Figure 2.1]
- (a)State the term for maintaining constant conditions, such as temperature, in the body.[1]
- (b)Suggest three things that could happen to account for the shape of the curve during time E.[3]
- (c)Explain what is happening in the body to cause the change in body temperature at time F.[3]
- (d)(i)the process by which the return to a set point, as illustrated by Fig. 2.1, is achieved,[1]
- (d)(ii)the part of the brain that controls this process.[1]
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 (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [1] homeostasis ;
- [3] 1 body temperature increased ;
- [3] 2 exercise AW;
- [3] 3 increased / high + surrounding AW temperature ;
- [3] 4 increased / high + surrounding AW humidity ;
- [3] 5 hot + food / drink ;
- [3] 6 increased / high + metabolism / respiration ;
- [3] 7 fever/illness ;
- [3] 8 ovulation;
- [3] 9 wear more clothes AW ;
- [3] 1 sweat;
- [3] 2 evaporation;
- [3] 3 vasodilation AW ;
- [3] 4 reduced + metabolism / respiration;
- [3] 5 more blood + to skin ;
- [3] 6 heat loss / radiation;
- [1] negative feedback;
- [1] hypothalamus ;
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