Exploring the Nitrogen Cycle

Why is nitrogen essential for all living organisms?

• It is a primary component of cell membranes.

• It provides energy for cellular processes.

• It is necessary for the synthesis of amino acids and proteins.

• It helps in the formation of DNA.

How do animals obtain the nitrogen they need?

• By eating plants or other animals.

• By photosynthesis.

• By drinking water.

• By absorbing it from the air.

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Why can't most plants use the nitrogen present in the atmosphere?

• It is bound to other elements making it inaccessible.

• It is toxic to plants in its pure form.

• It is too concentrated for plants to absorb.

• It is in a gaseous form that is not usable by plants.

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What natural process helps in fixing atmospheric nitrogen?

• Lightning

• Respiration

• Evaporation

• Photosynthesis

What are legumes and how do they contribute to nitrogen fixation?

• They are a type of bacteria that fix nitrogen.

• They are plants that have a symbiotic relationship with nitrogen-fixing bacteria.

• They are fungi that decompose organic matter.

• They are animals that release nitrogen into the soil.

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What is the role of bacteria in the nitrogen fixation process in legumes?

• They absorb water and nutrients from the soil.

• They decompose dead plant matter.

• They convert nitrogen gas into compounds usable by plants.

• They provide energy for the plants.

What happens during the decay side of the nitrogen cycle?

• Nitrogen gas is absorbed by plants.

• Nitrogen is converted into oxygen.

• Nitrogen compounds are released from decaying tissues.

• Nitrogen is fixed into the soil.

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What is the function of denitrifying bacteria in the nitrogen cycle?

• They convert nitrogen compounds back into nitrogen gas.

• They fix nitrogen into the soil.

• They help plants absorb nitrogen.

• They produce nitrogen-rich fertilizers.

How do artificial fertilizers impact the nitrogen cycle?

• They increase the nitrogen content in water supplies, causing pollution.

• They reduce the amount of nitrogen in the soil.

• They help in the natural fixation of nitrogen.

• They have no impact on the nitrogen cycle.

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What is one of the environmental consequences of nitrogen pollution from fossil fuels?

• Increased plant growth in forests.

• Acid rain that damages woodlands and waterways.

• Decreased levels of atmospheric nitrogen.

• Improved water quality in rivers and lakes.

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