Nutrient Cycling MCQs (Quiz 5)

1. Hydrolysis of minerals involves _____________

Reaction of water with minerals to form new substances

Physical fragmentation of minerals by wind

Expansion of water in minerals upon freezing

Reaction between oxygen and minerals

2. Rust formation on rocks is an example of ______________

Oxidation

Carbonation

Hydrolysis

Exfoliation

3. 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 microbial breakdown of organic matter releasing inorganic nutrients

The addition of mineral nutrients to soil through weathering of bedrock

The biological conversion of nitrates into atmospheric nitrogen gas

4. Which substance is the starting material for nitrification?

Ammonia / Ammonium (NH₃ / NH₄⁺)

Nitrogen gas (N₂)

Nitrate (NO₃⁻)

Urea

5. Deforestation accelerates climate change primarily because it ____________

Decreases the capacity of ecosystems to absorb atmospheric CO₂

Increases nitrogen fixation in forest soils

Enhances decomposition of carbonate rocks

Reduces phosphorus weathering rates

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

Wind

Temperature

Gravity

Water

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

It permanently removes carbon from biological systems

It prevents carbon fixation by plants

It converts atmospheric nitrogen into carbon dioxide

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

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

Respiratory production of CO₂ by the human population

Removal of carbon from the atmosphere in fertilizer production

Release of carbon from fossil fuel deposits

Accelerated removal of carbon from the atmosphere by forests

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

A volcano releasing CO₂ into the atmosphere

Ocean water dissolving atmospheric CO₂

Soil storing organic carbon

A growing forest absorbing CO₂

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

Rock salt

Mica

Feldspar

Quartz

Question 1 of 10

Nutrient Cycling MCQs (Quiz 5)

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