Nutrient Cycling MCQs (Quiz 3)

1. Which statement correctly distinguishes weathering from denudation?

Weathering and denudation are identical processes

Denudation is the breakdown of rocks; weathering is the transport of sediments

Weathering includes erosion; denudation does not

Weathering is a component of denudation, which also includes erosion and mass wasting

2. Breakdown and decomposition of rocks at or near the Earth’s surface is called __________________

Erosion

Deposition

Denudation

Weathering

3. Detritivores primarily feed on _____________

Atmospheric gases

Mineral particles

Living producers

Dead organic matter and debris

4. In plants, absorption primarily refers to ________________________________

Conversion of soil nutrients into gaseous form

Excretion of excess minerals through root tips

Uptake of water and dissolved mineral ions from the soil through roots

Storage of water and nutrients in root sediments

5. _____________ are the primary product of biological nitrogen fixation from atmospheric N₂

Complex proteins

NH₃ / NH₄⁺

Amino acids

Simple proteins

6. In ecology, nutrient budget refers to _________________________

The cost of fertilizer application

The balance of nutrient inputs, outputs, and storage

The number of organisms in an ecosystem

The rate of decomposition

7. ___________________ is the process, specialized bacteria use to convert unreactive atmospheric nitrogen gas into ammonia, making it available to living organisms

Nitrogen fixation

Ammonification

Nitrification

Denitrification

8. ____________________________ is called nutrient turnover

The rate at which nutrients are cycled and recycled through the biotic and abiotic components of an ecosystem

The conversion of inorganic minerals into sedimentary rock

The permanent locking of nutrients into geological formations

The irreversible loss of nutrients from an ecosystem

9. Ammonification is the process that releases which nitrogen-containing compound ____________ into the soil

Oxygen gas (O₂)

Carbon dioxide (CO₂)

Nitrogen gas (N₂)

Ammonia (NH₃)

10. __________________ involves the physical breaking of rocks without changing their chemical composition

Chemical weathering

Oxidation

Physical weathering

Hydrolysis

Nutrient Cycling MCQs (Quiz 3)

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