O-LevelBiologyEcology & Environment5090/22 · Oct/Nov 2019 · Q810 Marks
Describe the possible harmful effects of human activity on the ecosystem of a tropical rainforest.
- (a)Describe the possible harmful effects of human activity on the ecosystem of a tropical rainforest.[7]
- (b)The Sun is the principal source of energy in an ecosystem such as a tropical rainforest. Outline the flow of energy through an ecosystem such as a tropical rainforest. In your answer you should make reference to named levels in food webs.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [7] deforestation AW ; soil erosion / flooding / landslides ; desertification AW/less rainfall / drought / less transpiration ; loss of habitat ; extinction / loss of species / endangered species / loss of biodiversity ; loss of potential medicines ; carbon dioxide increase / oxygen decrease ; greenhouse effect / global warming / climate change AW ; effect on food chain ; named effect on local people ; release AW + sulfur dioxide / nitrogen oxides ; acid rain; damage to trees / acidification of soil / acidification of rivers AW ;
- [3] non-cyclical / does not return to the Sun ; producer + plant / named plant; photosynthesis ; light into chemical; consumer / carnivore / herbivore ; decomposers / decomposition ; (energy) lost / not all passed on ;
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