Carbon & Nitrogen Cycles

Which of the following processes contributes to the carbon cycle?

• combustion

• respiration

• photosynthesis

• all of the above

The source of carbon to plants in the carbon cycle is

• fossil fuels

• carbonate rocks

• carbon dioxide

• all of the above

The conversion of nitrates to nitrogen is called

• Ammonification

• Nitrification

• Nitrogen fixation

• Denitrification

The role of bacteria in the carbon cycle occurs in which process below?

• Decomposition of organic compounds

• Combustion

• Photosynthesis

• None of the above

In the carbon cycle, the human body returns carbon to the atmosphere through

• formation of glucose

• waste products

• photosynthesis

• respiration

Respiration is the process by which ____________ is consumed and _______________ is produced.

• carbon dioxide, oxygen

• carbon dioxide, energy

• energy, carbon dioxide

• oxygen, carbon dioxide

Conversion of ammonia to nitrite and then to nitrates is called

• Ammonification

• Denitrification

• Assimilation

• Nitrification

Most of the global warming is due to the perturbation of which of these cycles?

• Nitrogen cycle

• Carbon cycle

• Water cycle

• All of these cycles equally contribute

By this method, the majority of carbon moves from the lithosphere to the atmosphere

• erosion

• deposition

• weathering

• fossil fuel burning

In which form do animals gain nitrogen?

• Ammonium

• Nitrate

• Protein

• Nitrite