Nutrient Cycling MCQs (Quiz 12)

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

They oxidize ammonium ions into nitrite ions

They reduce nitrates into nitrogen gas during denitrification

They convert atmospheric N₂ into nitrates for plant use

They break down organic nitrogen from dead organisms into ammonium ions

2. Mycorrhizal fungi assist plants primarily by ____________________

Fixing atmospheric nitrogen into ammonium ions

Decomposing leaf litter into inorganic mineral ions

Extending hyphal networks to absorb phosphorus and other immobile nutrients

Converting nitrates into a form usable by plant cells

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

Predation

Pollination

Competition

Decomposition

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

NO₃⁻ → NO₂⁻ → NH₄⁺

N₂ → NH₃ → NO₂⁻

NH₄⁺ → N₂ → NO₃⁻

NH₄⁺ → NO₂⁻ → NO₃⁻

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

Carbon cycle

Phosphorus cycle

Oxygen cycle

Nitrogen cycle

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

Chemical weathering

Frost wedging

Thermal expansion

Salt weathering

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

Hydrological cycle

Sedimentary cycle

Lithospheric cycle

Gaseous cycle

8. Nutrient reservoirs function primarily to _______________

Buffer ecosystems against nutrient shortages

Accelerate decomposition

Prevent nutrient transfer

Reduce nutrient uptake

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

Converting solar energy into chemical energy

Synthesizing new proteins for consumers

Absorbing carbon dioxide from the atmosphere

Releasing inorganic nutrients from dead organic matter

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

Phosphorus cycle

Calcium cycle

Nitrogen cycle

Magnesium cycle

Nutrient Cycling MCQs (Quiz 12)

Leave a Reply Cancel reply

Notes

Welcome to Agro-Publishers