Fertilisers Quiz
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5 questions, one answer each
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1. Which two types of compound are commonly used as fertilisers?
- A. Chlorides and sulfates
- B. Ammonium salts and nitrates
- C. Carbonates and oxides
- D. Halides and hydroxides
2. What does the 'K' in an NPK fertiliser stand for?
- A. Krypton
- B. Kilogram
- C. Potassium
- D. Calcium
3. How can fertiliser applied to farmland end up polluting a nearby river?
- A. It evaporates directly into the atmosphere
- B. Excess fertiliser runs off the land into water sources
- C. It reacts with rainwater to form a harmless gas
- D. Fertiliser cannot enter water sources
4. What is eutrophication?
- A. The process of purifying drinking water using chlorine
- B. Excess nutrients in water causing excessive plant/algal growth and oxygen depletion
- C. The absorption of fertiliser nutrients directly by plant roots
- D. A method of removing nitrates from water using filtration
5. A lake near farmland shows a thick green algal bloom in summer, followed by large numbers of dead fish a few weeks later. Using your knowledge of fertilisers and eutrophication, explain this sequence of events.
- A. The algae directly poisoned the fish with toxins from fertiliser
- B. Nitrate and phosphate run-off from fertiliser caused excessive algal growth; as the algae later died and decomposed, oxygen-consuming microbes depleted dissolved oxygen, suffocating the fish
- C. The fish died from drinking too much fertiliser-contaminated water directly
- D. Excess potassium in the fertiliser increased the water's pH, burning the fish's gills