Nitrogen Cycle

Plants and animals need nitrogen to make __________.

• Protein

• DNA

• Lipids

• Minerals

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How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the plants they eat

• From the meat they eat

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What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• lightning

Nitrogen fixing bacteria, lives in nodules on the root of a plant called

• Broccoli

• Legumes

• Beats

• Soybeans

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How is Nitrogen fixed naturally? Choose three answer choices.

• Volcanic activity

• Lighting

• Greenhouse gases

• bacteria

• Fungus

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What is denitrification?

• Conversation of nitrite back to nitrogen gas

• Conversation of ammonia back to nitrogen gas

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Nitrogen accounts nearly 78% of the air. Still Nitrogen is the most limiting nutrient for plant growth because

• N2 cannot be directly utilized by plants

• Nitrogen can be pulled directly from the atmosphere and used by plants immediately.

• Nitrogen is almost an inert gas as N involved reaction requires extreme conditions such as high temperature

• Nitrogen can be inhaled by animals and used for DNA rebuilding.

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Organisms require nitrogen to make which of the following?

• glucose

• nucleic acids

• proteins

• carbohydrates

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What can an excessive amount of nitrogen cause in ecosystems?

• Disrupts the equilibrium of ecosystem, causing number of species to decline

• Leads to improvement of an ecosystem due to healthy plant growth

• Excess nitrogen in the atmosphere can produce pollutants such as ammonia and ozone

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Nitrification happens in the ______

• Air

• Lightning

• Nodules of legumes

• Plants