Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
Which of the following are implications of removing crops by harvesting?
(Select all that apply)
mineral ions are not returned to the soil through decomposition
there is a net import of nutrients into agricultural land
more nutrients are available to decomposers
nutrients are extracted from the nitrogen and phosphorus cycles
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What are fertilisers used for?
to reintroduce nutrients back into the soil
to remove nutrients from the soil
to reduce plant growth
to increase the pH of the soil
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What are artificial (inorganic) fertilisers made from?
crop residues
organic matter
mineral nutrients mined from rocks
manure
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How do natural (organic) fertilisers release nutrients?
through gradual decomposition of organic matter
through chemical reactions with the soil
through immediate dissolution in water
through evaporation
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Which of the following is NOT a potential environmental impact of excessive nitrogen-rich fertiliser use?
increased soil fertility
eutrophication
leaching
reduced species diversity
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How can excessive nitrogen-rich fertiliser use affect species diversity?
by favouring the growth of rapidly growing species like grasses
by increasing the growth of all species
by favouring the growth of slowly growing species
by reducing the growth of all species
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What is leaching?
the washing out of nutrients from the soil
the addition of nutrients to the soil
the decomposition of organic matter in the soil
the evaporation of water from the soil
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Why are artificial fertilisers particularly prone to leaching?
their mineral nutrients dissolve easily in water
they are made from organic matter
they are applied in large quantities
they are not water-soluble
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What happens after growth of surface algae blocks light to plants and algae at lower depths?
these plants and algae die due to insufficient light for photosynthesis
these plants and algae produce more oxygen
these plants and algae move to the surface of the water
these plants and algae grow rapidly
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What causes the depletion of oxygen in the water during eutrophication?
the release of toxic wastes by anaerobic organisms
the death of fish and other aquatic life
the decomposition of dead plant material by aerobic saprobiontic bacteria
the growth of algae at the surface of the water
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What is the term for the excessive growth of algae in water bodies due to nutrient pollution?
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Describe the process of eutrophication, including its consequences.
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