Nitrogen Quiz

What percentage of the air is nitrogen?

• Approximately 21%

• Approximately 78%

• Approximately 50%

• Approximately 10%

What is the symbol for nitrogen?

• Ni

• Ne

• N

• Nt

What state is nitrogen in at room temperature?

• Solid

• Liquid

• Gas

• Plasma

Nitrogen is needed for which of the following functions?

• Building proteins and DNA structure

• Photosynthesis and respiration

• Digestion and circulation

• Vision and hearing

Why is nitrogen essential for all living organisms?

• It is a component of many essential biological molecules.

• It provides energy for cellular processes.

• It is the main component of cell membranes.

• It acts as a catalyst in metabolic reactions.

What does the nitrogen cycle exemplify?

• A simple linear process.

• An example of interconnected systems.

• A closed system with no external influence.

• A process that occurs only in plants.

What is the importance of biogeochemical cycles?

• They help in recycling elements within the physical environment and biosphere.

• They increase the amount of carbon in the atmosphere.

• They reduce the biodiversity in ecosystems.

• They prevent the formation of new elements.

Which cycle is associated with the recycling of nitrogen?

• Carbon Cycle

• Water Cycle

• Nitrogen Cycle

• Oxygen Cycle

Why can't most organisms use nitrogen gas directly from the air?

• It is too reactive

• It is inert

• It is too heavy

• It is toxic

In what form must plants secure their nitrogen?

• Nitrogen gas

• Nitrate ions and ammonia

• Oxygen gas

• Carbon dioxide