Biology Review thru March 12

How does increased carbon dioxide in the atmosphere affect the ocean?

• it increases the acidity of the water
• it increases the amount of oxygen
• algae increases
• animals will shells and skeletons are protected from changes

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When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

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Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

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How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

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In general, algal blooms occur when

• toxins accumulate in shellfish.

• nutrients decrease in the water.

• nutrients increase in the water.

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

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Why is nitrogen important to organisms?

• All plants and animals need nitrogen to make amino acids, proteins and DNA.
• All plants and animals need nitrogen to make fatty acids and carbohydrates. 
• All plants and animals need nitrogen to make sugar.
• None of the above. 

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The only organisms that can convert nitrogen in the atmosphere into a form useful to living things are nitrogen-fixing

• plants

• bacteria

• insects

• animals

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In the food web, which organisms release the carbon from dead things back into the environment?

• Producers
• Consumers
• Scavengers
• Decomposers

Which of the following is a density-independent limiting factor?

• natural disaster
• predation
• disease
• parasitism