Tank Maintenance

What is the first stage of the nitrogen cycle in an aquarium?

• Nitrification

• Ammonification

• Denitrification

• Nitrogen fixation

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Which tool is used to measure the pH level in an aquarium?

• Thermometer

• pH test

• Hydrometer

• Refractometer

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What is the primary purpose of a nitrate test in an aquarium?

• To measure oxygen levels

• To measure ammonia levels

• To measure nitrate levels

• To measure pH levels

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How does a high pH level affect fish in an aquarium?

• It increases oxygen levels

• It can cause stress and illness in fish

• It promotes algae growth

• It has no effect on fish

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DOK Level 2: Skill/Concept

Which of the following is a common tool used for water changes in aquariums?

• Net

• Siphon

• Heater

• Filter

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What is the role of nitrite in the nitrogen cycle of an aquarium?

• It is the final product of the cycle

• It is converted into nitrate by bacteria

• It is harmless to fish

• It is used by plants for growth

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DOK Level 2: Skill/Concept

When starting a new aquarium tank, which stage of the nitrogen cycle is crucial to establish first?

• Denitrification

• Nitrification

• Ammonification

• Nitrogen fixation

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DOK Level 2: Skill/Concept

What is the ideal pH range for most freshwater aquariums?

• 4.0 - 5.0

• 6.0 - 7.5

• 8.0 - 9.0

• 9.5 - 10.5

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Which of the following is a sign that a water change is needed in an aquarium?

• Crystal clear water

• High nitrate levels

• Low oxygen levels

• Low pH levels

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DOK Level 2: Skill/Concept

What is the chemical formula for nitrate?

• NO

• NO2 (-)

• NO3 (-)

• NH3

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DOK Level 1: Recall