Dissolved Oxygen in Water Quiz

What is dissolved oxygen?

• Oxygen that is found in the atmosphere

• Oxygen that is evaporated from water

• Oxygen that is mixed with water

• Oxygen that is solidified in water

What happens when something dissolves in water?

• It forms a solution

• It becomes solid

• It turns into gas

• It disappears

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How does oxygen enter a body of water?

• Through evaporation

• From the atmosphere

• From the soil

• Through volcanic activity

Why do fish like salmon need colder waters?

• Because they need more oxygen

• Because they are cold-blooded

• Because they need less oxygen

• Because they prefer colder climates

What happens when plants and cyanobacteria decay at the bottom of a lake?

• They produce more nutrients

• They attract more fish

• They consume all the oxygen

• They release more oxygen

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What is the main cause of eutrophication in lakes and rivers?

• Industrial pollution

• Air pollution

• Noise pollution

• Light pollution

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How do living things adapt to the amount of dissolved oxygen in water?

• By changing their color

• By changing their size

• By changing their behavior

• By changing their habitat

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What can humans do to preserve marine and freshwater ecosystems?

• Recycle and dispose of trash properly

• Use more plastic

• Dump trash in water bodies

• Increase pollution levels

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