Carbon cycle

Carbon enters the living world through the process of _____.

• photosynthesis
• respiration
• combustion
• decomposition

Carbon enters the living world through the process of _____.

• photosynthesis
• respiration
• combustion
• decomposition

In the atmosphere, carbon attaches to oxygen to form _____.

• C
• O
• CO₂ 
• C₆H₁₂O₆

The process of burning is called _____.

• decomposition
• combustion
• respiration

In this diagram, how many ways can carbon enter the living world?

• one
• two
• three
• four

Burning fossil fuel has which effect in the carbon cycle?

• It removes carbon dioxide from the atmosphere.
• It puts carbon dioxide under the ground.
• It adds carbon dioxide to the atmosphere.
• It has no effect in the carbon cycle.

What is the an important element for living things.

• Neon
• Hydrogen
• Helium
• Carbon

Carbon enters the soil through dead plant or animal matter.

• Decomposition

• Respiration

• Photosynthesis

• Diffusion

How is the burning of fossil fuels related to global warming?

• Magic
• Fuels are hot
• Greenhouse effect
• Photosynthesis

Which process converts carbon in the form of sugar into carbon dioxide gas?

• Bioremediation
• Photosynthesis
• Respiration
• Transpiration