Lesson 3.5.4.2
3.5.4.2 Fertilisers and their environmental effects Quiz: AQA Biology, Unit 5
20 questions
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Lesson 3.5.4.2, Fertilisers and their environmental effects: 20 multiple choice questions for the AQA Biology (7402), Unit 5: Energy transfers in and between organisms, written with Revision Ninja.
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The 20 questions
-
Why are fertilisers added to agricultural soil after crop harvesting?
- Kill pest species
- Replace lost minerals
- Increase soil pH
- Retain soil moisture
-
What term describes the washing of dissolved nutrients out of soil by water?
- Eutrophication
- Nitrification
- Leaching
- Ammonification
-
Which substance is an example of a natural fertiliser?
- Ammonium nitrate
- Triple superphosphate
- Cattle manure
- Potassium chloride
-
Which organisms multiply rapidly first when nitrate run-off enters a lake?
- Algae
- Freshwater fish
- Aerobic bacteria
- Submerged plants
-
What process causes dissolved oxygen levels to fall during eutrophication?
- Bacterial respiration
- Algal photosynthesis
- Thermal expansion
- Anaerobic fermentation
-
Why do nitrate ions leach from soil more readily than ammonium ions?
- They are cations
- They are larger
- They are insoluble
- They are anions
-
Which event is most likely if heavy rain falls after fertiliser application?
- Soil compaction
- Nitrogen fixation
- Denitrification
- Nitrate leaching
-
A bag of fertiliser weighs 100 kg and contains 20 kg of nitrogen. What is the percentage of nitrogen in the fertiliser?
- 50%
- 2%
- 20%
- 80%
-
What directly causes fish deaths in late-stage eutrophication of a lake?
- Lack of oxygen
- Algal toxins
- Excessive heat
- High light levels
-
Which farming practice helps to reduce the risk of nitrate leaching?
- Bare fallowing
- Over-irrigation
- Winter ploughing
- Seasonal application
-
What is an advantage of using artificial fertilisers over natural ones?
- High organic content
- Fast nutrient release
- Zero leaching risk
- Improved soil texture
-
Why is high nitrate concentration in drinking water dangerous to human health?
- Damages tooth enamel
- Causes kidney stones
- Reduces oxygen transport
- Destroys stomach acid
-
Why do submerged aquatic plants die during an algal bloom?
- Light is blocked
- Water becomes acidic
- Oxygen is toxic
- Nitrates are absent
-
Which nutrient is usually the limiting factor for algal growth in freshwater lakes?
- Nitrate
- Ammonium
- Phosphate
- Potassium
-
Which bacterial process removes nitrates from waterlogged, anaerobic soil?
- Ammonification
- Nitrogen fixation
- Nitrification
- Denitrification
-
What main advantage do artificial fertilisers have over natural fertilisers?
- Zero environmental risk
- Known chemical composition
- Slower leaching rate
- Higher organic content
-
Which process describes rainwater washing soluble nitrates out of farmland soil?
- Bioaccumulation
- Eutrophication
- Leaching
- Nitrification
-
What ecological process is triggered when excess fertiliser enters aquatic ecosystems?
- Bioaccumulation
- Succession
- Ammonification
- Eutrophication
-
What is the primary source of excess nutrients causing river algal blooms?
- Soil wind erosion
- Agricultural fertiliser run-off
- Industrial thermal discharge
- Atmospheric nitrogen fixation
-
What determines the required amount of artificial fertiliser applied to a crop?
- Harvested nutrient losses
- Soil bacterial density
- Total crop biomass
- Rate of transpiration
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