E4-Highg temperature can cause some aquatic organism die E5-Increase in temparature encourage some algae to grow rapidly 1 E6-Lead to high BOD value F + any 3E 1 1 1 1 1 1 4 The greenhouse effect No Marking scheme Marks (b) The following statements are human activities in an ecosystem The use of chlorofluorocarbon in air conditioners and refrigerator Combustion of fossil fuel in the factories Based on the statement, discuss how the activities endanger the ecosystem F1-(CFC) cause depletion of ozone layer 1 E1-Penetration of excess /more UV rays 1 E2-Skin cancer/melanoma/sunburns/cataract//any suitable example 1 E3-Reduce body immune system 1 E4-Leaf cells and chlorophyll are easily damaged //lower rate of photosynthesis 1 1 E5-Kill microorganism/phytoplankton 1 E6-Distruption /destruction of food chain /web 1 E7-Climatic changes//any suitable example 1 E8-Surrounding temperature increases F2-(combustion of fossil fuel) causes acid rain //air pollution 1 E7-Factories release a amount of nitrogen oxide/nitrogen dioxide/sulphur dioxide/carbon 1 monoxides/dust in the atmosphere E8-Acid rain become acidic (so less suitable for the cultivation of food chain /food web –soil 1 E10-Photosynthetic tissue are destroyed//root damaged and cannot absorb mineral lower 1 rate of photosynthesis E11-Metal railing /bridges corrodes / any suitable example 1 1 E12-Health problem: asthma/bronchitis/and any suitable respiratory problem
E4-Highg temperature can cause some aquatic organism die E5-Increase in temparature encourage some algae to grow rapidly E6-Lead to high BOD value F + any 3E 1 1 1 1 1 1 1 4 The greenhouse effect No Marking scheme Marks (b) The following statements are human activities in an ecosystem The use of chlorofluorocarbon in air conditioners and refrigerator Combustion of fossil fuel in the factories Based on the statement, discuss how the activities endanger the ecosystem F1-(CFC) cause depletion of ozone layer E1-Penetration of excess /more UV rays E2-Skin cancer/melanoma/sunburns/cataract//any suitable example E3-Reduce body immune system E4-Leaf cells and chlorophyll are easily damaged //lower rate of photosynthesis E5-Kill microorganism/phytoplankton E6-Distruption /destruction of food chain /web E7-Climatic changes//any suitable example E8-Surrounding temperature increases F2-(combustion of fossil fuel) causes acid rain //air pollution E7-Factories release a amount of nitrogen oxide/nitrogen dioxide/sulphur dioxide/carbon monoxides/dust in the atmosphere E8-Acid rain –soil become acidic (so less suitable for the cultivation of food chain /food web E10-Photosynthetic tissue are destroyed//root damaged and cannot absorb mineral lower rate of photosynthesis E11-Metal railing /bridges corrodes / any suitable example E12-Health problem: asthma/bronchitis/and any suitable respiratory problem 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1