O-LevelBiologyCoordination & Response5090/21 · May/June 2019 · Q710 Marks
Describe the removal of named toxic materials and waste products of metabolism from the human body.
- (a)Describe the removal of named toxic materials and waste products of metabolism from the human body.[7]
- (b)Explain how named waste products are removed from a plant.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [7] carbon dioxide;
- [7] by lungs / alveoli ;
- [7] lost in breath / breathing out / action any one set of muscles ;
- [7] urea;
- [7] drugs or one named ;
- [7] broken down hormones ;
- [7] salts / water;
- [7] kidneys;
- [7] urine;
- [7] skin;
- [7] sweat;
- [7] A diaphragm relaxes / moves up / domes
- [3] carbon dioxide out ;
- [3] oxygen out;
- [3] night + CO2/day + O2 ;
- [3] out by diffusion ;
- [3] out through stomata / guard cells ;
- [3] leaf fall;
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