Nutrient Cycling MCQs (Quiz 5)

1. Hydrolysis of minerals involves _____________

Physical fragmentation of minerals by wind

Reaction between oxygen and minerals

Reaction of water with minerals to form new substances

Expansion of water in minerals upon freezing

2. Deforestation accelerates climate change primarily because it ____________

Reduces phosphorus weathering rates

Increases nitrogen fixation in forest soils

Enhances decomposition of carbonate rocks

Decreases the capacity of ecosystems to absorb atmospheric CO₂

3. Rust formation on rocks is an example of ______________

Oxidation

Hydrolysis

Exfoliation

Carbonation

4. Which of the following is an example of a nutrient source in the carbon cycle?

Ocean water dissolving atmospheric CO₂

Soil storing organic carbon

A volcano releasing CO₂ into the atmosphere

A growing forest absorbing CO₂

5. Why does the combustion of fossil fuels disrupt the natural carbon cycle?

It transfers carbon from long-term geological storage to the atmosphere rapidly

It permanently removes carbon from biological systems

It prevents carbon fixation by plants

It converts atmospheric nitrogen into carbon dioxide

6. Which of the following minerals is highly susceptible to solution weathering?

Mica

Feldspar

Quartz

Rock salt

7. A major perturbation of the carbon cycle by human activity is associated with _____________________

Removal of carbon from the atmosphere in fertilizer production

Respiratory production of CO₂ by the human population

Release of carbon from fossil fuel deposits

Accelerated removal of carbon from the atmosphere by forests

8. Which weathering agent is considered the most important overall?

Water

Temperature

Wind

Gravity

9. In the context of nutrient cycling, leaching is best defined as ____________________

The downward movement of water through soil that carries dissolved nutrients away from the root zone

The biological conversion of nitrates into atmospheric nitrogen gas

The microbial breakdown of organic matter releasing inorganic nutrients

The addition of mineral nutrients to soil through weathering of bedrock

10. Which substance is the starting material for nitrification?

Ammonia / Ammonium (NH₃ / NH₄⁺)

Nitrogen gas (N₂)

Urea

Nitrate (NO₃⁻)

Question 1 of 10

Nutrient Cycling MCQs (Quiz 5)

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