Nutrient Cycling MCQs (Quiz 12)

1. Which nutrient cycle is most directly replenished by volcanic weathering?

Nitrogen cycle

Carbon cycle

Phosphorus cycle

Oxygen cycle

2. Which nutrient cycle is the best example of a gaseous cycle?

Magnesium cycle

Nitrogen cycle

Calcium cycle

Phosphorus cycle

3. Mycorrhizal fungi assist plants primarily by ____________________

Converting nitrates into a form usable by plant cells

Fixing atmospheric nitrogen into ammonium ions

Decomposing leaf litter into inorganic mineral ions

Extending hyphal networks to absorb phosphorus and other immobile nutrients

4. Nutrient reservoirs function primarily to _______________

Buffer ecosystems against nutrient shortages

Reduce nutrient uptake

Prevent nutrient transfer

Accelerate decomposition

5. In humid tropical regions, the dominant weathering process is_______________

Thermal expansion

Frost wedging

Chemical weathering

Salt weathering

6. Which of the following correctly describes the role of decomposers in the nitrogen cycle?

They oxidize ammonium ions into nitrite ions

They convert atmospheric N₂ into nitrates for plant use

They reduce nitrates into nitrogen gas during denitrification

They break down organic nitrogen from dead organisms into ammonium ions

7. Decomposers play an essential role in nutrient cycling by ______________________

Synthesizing new proteins for consumers

Absorbing carbon dioxide from the atmosphere

Converting solar energy into chemical energy

Releasing inorganic nutrients from dead organic matter

8. A nutrient cycle whose major reservoir is the atmosphere is classified as ____________

Lithospheric cycle

Sedimentary cycle

Hydrological cycle

Gaseous cycle

9. Which of the following is the correct sequence of nitrification?

NO₃⁻ → NO₂⁻ → NH₄⁺

NH₄⁺ → NO₂⁻ → NO₃⁻

N₂ → NH₃ → NO₂⁻

NH₄⁺ → N₂ → NO₃⁻

10. Which ecosystem process directly links nutrient cycling with soil fertility?

Competition

Pollination

Predation

Decomposition

Nutrient Cycling MCQs (Quiz 12)

Leave a Reply Cancel reply

Notes

Welcome to Agro-Publishers