O-LevelBiologyEcology & Environment5090/21 · May/June 2016 · Q57 Marks
Malaria is a disease caused by a parasite that is transmitted from one person to another by a vector.
- (a)Name the vector of the parasite that causes malaria.[1]
- (b)(i)Spread of the vector may be controlled by using an insecticide. State two other ways of controlling the spread of the vector. 1 2[2]
- (b)(ii)Resistance to the insecticide can appear in the vector population. Describe how the process of natural selection may bring about resistance of the vector to insecticide.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [1] mosquito/Anopheles ;
- [max 2] drain swamps/prevent stagnation of water AW;
- add oil on water;
- reference to biological control/fish or bacteria into ponds;
- release irradiated males;
- [max 4] (resistant) reproduce ;
- reference to (resistant) allele/gene;
- inherited/passed on ;
- reference to repetition over many generations ;
- (resistant) become more common;
- reference to evolution; A ORA for each marking point
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