Carbon and Nitrogen Cycle

Carbon and Nitrogen

Review and Quiz: the Carbon and the Nitrogen cycles

The Carbon Cycle

The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms

The major steps of the carbon cycle

Photosynthesis, Decomposition, Respiration and Combustion. Carbon cycles from the atmosphere into plants and living things

The Nitrogen Cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical.

The major stages of the Nitrogen Cycle

Nitrogen cycle consists of four main steps namely: Nitrogen Fixation. Ammonification/ Decay. Nitrification.

Multiple Choice

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

• Ocean

• Atmosphere

• Plants

• Fossil fuels

Multiple Choice

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

• Using a gas stove

• burning wood for heat

• planting trees

• riding the school bus

Multiple Choice

Combustion is another word for _______________.

• Growing trees

• burning

• a fast train

• when water goes into the air

Multiple Choice

What does not produce carbon dioxide?

• Animal respiration

• Burning fossil fuels

• Photosynthesis

• Decaying plants

Multiple Choice

How do living organisms return carbon to the atmosphere in the carbon cycle?

• Respiration and Photosynthesis

• Respiration and Decomposition

Multiple Select

(Check all that apply) Why is the increase of Greenhouse gasses a big issue?

• It causes a major decrease in people

• It creates the need for more factories

• It can increase the overall temperature

• Increase the chances for big storms

Multiple Choice

Why is the carbon cycle important?

• It helps animals to digest food

• It takes nitrogen and oxygen out of the atmosphere

• It continuously reuses and recycles carbon in the ecosystem

• None of these

Multiple Choice

Carbon is used by plants during which process?

• Photosynthesis

• respiration

• combustion

• none of the above

Multiple Choice

What molecules do plants produce using nitrogen?

• fats

• proteins

• sugars

Multiple Choice

In which form do animals gain nitrogen?

• protein

• ammonium

• nitrates

• none of these

Multiple Choice

The diagram (click to enlarge) shows part of the nitrogen cycle.

Which of the numbered stages involve bacteria?

• 1 and 3

• 2 and 4

• 3 and 4

Multiple Select

The diagram below shows part of the nitrogen cycle.

Which stage is decomposition? (click any that apply)

• 1 and 2

• 3

• 4

• 2 and 4

Multiple Choice

The diagram shows part of the nitrogen cycle.

Which stage is nitrification?

• Stage A

• Stage B

• Stage C

Multiple Choice

Which kind of organisms are decomposers?

• Bacteria and Fungi

• Fungi and Insects

• Bacteria and Insects

• Fungi and fruit trees