Nutrient Cycling MCQs (Quiz 3)

1. In plants, absorption primarily refers to ________________________________

Storage of water and nutrients in root sediments

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

Excretion of excess minerals through root tips

Conversion of soil nutrients into gaseous form

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

Simple proteins

Amino acids

Complex proteins

NH₃ / NH₄⁺

3. Which statement correctly distinguishes weathering from denudation?

Weathering and denudation are identical processes

Weathering includes erosion; denudation does not

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

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

4. ____________________________ is called nutrient turnover

The conversion of inorganic minerals into sedimentary rock

The permanent locking of nutrients into geological formations

The irreversible loss of nutrients from an ecosystem

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

5. In ecology, nutrient budget refers to _________________________

The balance of nutrient inputs, outputs, and storage

The rate of decomposition

The cost of fertilizer application

The number of organisms in an ecosystem

6. Detritivores primarily feed on _____________

Dead organic matter and debris

Living producers

Atmospheric gases

Mineral particles

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

Physical weathering

Oxidation

Chemical weathering

Hydrolysis

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

Weathering

Deposition

Erosion

Denudation

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

Nitrification

Nitrogen fixation

Ammonification

Denitrification

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

Carbon dioxide (CO₂)

Oxygen gas (O₂)

Ammonia (NH₃)

Nitrogen gas (N₂)

Nutrient Cycling MCQs (Quiz 3)

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