Quiz

Plants, carbon and soil organic matter

Check what you remember about how carbon enters and leaves soils.

2 questions · Pass at 70% · +30 pts on first pass

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Question 1 · Multiple choice — select all that apply

Which of the following are ways that plants contribute to soil organic carbon? (Select all correct answers.)

Through fallen leaves, stems, and roots that enter the soil. By releasing root exudates — small organic compounds — into the surrounding soil. By absorbing soil organic matter and storing it in their leaves. By increasing soil temperature to accelerate decomposition. By compacting the soil to stabilize carbon.

Question 2 · Multiple choice — select all that apply

Which processes can reduce soil organic carbon stored in soils? (Select all correct answers.)

Microbial decomposition of organic matter. Soil erosion that removes topsoil. Returning crop residues to the soil after harvest. Removing biomass through harvest or residue removal. Burning vegetation during fires.