Nutrient Cycling MCQs (Quiz 5)

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

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

Respiratory production of CO₂ by the human population

2. Rust formation on rocks is an example of ______________

Carbonation

Hydrolysis

Exfoliation

Oxidation

3. Deforestation accelerates climate change primarily because it ____________

Enhances decomposition of carbonate rocks

Reduces phosphorus weathering rates

Decreases the capacity of ecosystems to absorb atmospheric CO₂

Increases nitrogen fixation in forest soils

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

The microbial breakdown of organic matter releasing inorganic nutrients

The biological conversion of nitrates into atmospheric nitrogen gas

The addition of mineral nutrients to soil through weathering of bedrock

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

5. Hydrolysis of minerals involves _____________

Expansion of water in minerals upon freezing

Reaction of water with minerals to form new substances

Physical fragmentation of minerals by wind

Reaction between oxygen and minerals

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

Wind

Gravity

Temperature

Water

7. 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

8. Which substance is the starting material for nitrification?

Ammonia / Ammonium (NH₃ / NH₄⁺)

Urea

Nitrate (NO₃⁻)

Nitrogen gas (N₂)

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

Rock salt

Feldspar

Mica

Quartz

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

It converts atmospheric nitrogen into carbon dioxide

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

Question 1 of 10

Nutrient Cycling MCQs (Quiz 5)

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