Sulfur Cycle

What are the different ways in which Sulfur is released to the atmosphere? Choose all that apply

• when phosphate goes through mineralization

• burning of fossil fuels

• when dimethyl sulfide (C₂H₆S) emitted from marine algae reacts with oxygen in the air

• when hydrogen sulfide (H₂S) emitted by volcanoes reacts with oxygen in the air

What are 2 sources of hydrogen sulfide (H₂S) and S0₂)?

• Burning of fossil fuels.

• Breakdown of Phosphate by bacteria.

• Volcanic emissions.

• Animals eating plants.

What is directly formed when the sulfur in coal is burned?

• Hydrogen sulfide (H₂S)

• Sulfuric acid(H₂SO₄)

• Nitrogen oxides (NO)

• Sulfur dioxide (SO₂)

What form of Sulfur do producers (plants) use?

• Sugar (C₆H₁₂O₆)

• Sulfide (S^-2)

• Sulfate (SO₄)

• sulfite (so₃)

Define the sulfur cycle

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What is the primary role of sulfur in the environment?

• A) It is a major component of DNA.

• B) It is essential for protein synthesis.

• C) It is a key element in the formation of carbohydrates.

• D) It is used in the photosynthesis process.

Which of the following processes releases sulfur into the atmosphere?

• A) Photosynthesis

• B) Respiration

• C) Volcanic eruptions

• D) Nitrogen fixation

What is the main form of sulfur absorbed by plants?

• A) Sulfide (S^-2)

• B) Sulfate (SO_4^2-)

• C) Elemental sulfur (S)

• D) Sulfur dioxide (SO_2)

How does sulfur dioxide (SO_2) primarily enter the atmosphere?

• A) Through the decay of organic matter

• B) By the burning of fossil fuels

• C) Via the process of photosynthesis

• D) Through nitrogen fixation

What is the significance of dimethyl sulfide (DMS) in the sulfur cycle?

• A) It is a major source of sulfur in the soil.

• B) It contributes to cloud formation and climate regulation.

• C) It is used by plants for growth.

• D) It is a byproduct of fossil fuel combustion.