Nutrient Cycling MCQs (Quiz 14)

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

Energy flow

Ecological succession

Biological productivity

Nutrient cycling

2. Nutrient cycling differs from energy flow because _____________

Energy is recycled but nutrients are not

Energy and nutrients follow identical pathways

Nutrients are recycled, whereas energy flows in one direction

Both are recycled continuously

3. Volcanic activity acts as a natural source of _________________

Sulfur compounds and carbon dioxide

Nitrogen compounds

Oxygen compounds

Organic matter

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

Weathering

Respiration and decomposition

Phosphorus cycling

Nitrogen fixation

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

Methane

Oxygen

Sulfur dioxide

Nitrogen

6. 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 becomes a carbon sink by absorbing atmospheric CO₂

Permafrost acts as a nutrient recycler by converting carbon into minerals

Permafrost shifts to a decomposer by directly breaking down living organisms

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

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

Immobilization occurs only in plants; assimilation occurs only in animals

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

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

Both processes permanently remove nutrients from the ecosystem nutrient cycle

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

Volcanism has no role in nutrient cycling

Volcanism permanently removes nutrients from ecosystems

Volcanism only affects marine ecosystems

Volcanism introduces and redistributes nutrients that later enter ecological cycles

9. Nutrient cycling is also commonly referred to as ______________________

Food cycle

Hydrological cycle

Geological cycle

Biogeochemical cycle

10. Nutrient flux refers to _____________________

Loss of nutrients through erosion

Movement of nutrients between ecosystem compartments

Storage of nutrients in reservoirs

Permanent accumulation of nutrients

Question 1 of 10

Nutrient Cycling MCQs (Quiz 14)

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