Nutrient Cycling MCQs (Quiz 14)

1. Nutrient cycling is also commonly referred to as ______________________

Hydrological cycle

Biogeochemical cycle

Geological cycle

Food cycle

2. Which of the following best describes the relationship between volcanism and nutrient cycling?

Volcanism permanently removes nutrients from ecosystems

Volcanism only affects marine ecosystems

Volcanism introduces and redistributes nutrients that later enter ecological cycles

Volcanism has no role in nutrient cycling

3. Nutrient cycling differs from energy flow because _____________

Nutrients are recycled, whereas energy flows in one direction

Energy and nutrients follow identical pathways

Energy is recycled but nutrients are not

Both are recycled continuously

4. Nutrient flux refers to _____________________

Storage of nutrients in reservoirs

Loss of nutrients through erosion

Permanent accumulation of nutrients

Movement of nutrients between ecosystem compartments

5. Volcanic activity acts as a natural source of _________________

Oxygen compounds

Sulfur compounds and carbon dioxide

Nitrogen compounds

Organic matter

6. Carbon captured by plants may eventually return to the atmosphere through _____________

Phosphorus cycling

Weathering

Nitrogen fixation

Respiration and decomposition

7. Which gas released from volcanoes contributes to acid rain formation?

Methane

Nitrogen

Oxygen

Sulfur dioxide

8. Which of the following correctly distinguishes nutrient immobilization from nutrient assimilation?

Immobilization occurs only in plants; assimilation occurs only in animals

Assimilation refers to nutrient loss through leaching; immobilization refers to gaseous loss

Both processes permanently remove nutrients from the ecosystem nutrient cycle

Both involve incorporation of nutrients into biomass, but immobilization specifically refers to microbial uptake that temporarily reduces nutrient availability to plants

9. Due to rising global temperatures, Arctic permafrost is thawing, allowing microbes to decompose previously frozen organic matter. What is the result of this change?

Permafrost transitions from a carbon sink to a carbon source, releasing CO₂ and CH₄ into the atmosphere

Permafrost acts as a nutrient recycler by converting carbon into minerals

Permafrost becomes a carbon sink by absorbing atmospheric CO₂

Permafrost shifts to a decomposer by directly breaking down living organisms

10. The continuous circulation of essential chemical elements between living organisms and the physical environment is known as ___________________

Ecological succession

Biological productivity

Nutrient cycling

Energy flow

Question 1 of 10

Nutrient Cycling MCQs (Quiz 14)

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