Nutrient Cycling MCQs (Quiz 8)

1. During the decomposition of organic matter, bacteria break down proteins and nucleic acids. What nitrogenous product is directly released by this process?

Nitrate ions (NO₃⁻)

Nitrite ions (NO₂⁻)

Urea

Ammonium ions (NH₄⁺)

2. Biological weathering may contribute to chemical weathering through ________________

Increasing rock density

Production of organic acids by organisms

Lowering atmospheric pressure

Reduction of humidity

3. Which statement best summarizes the ecological significance of weathering?

It only affects geological formations

It only alters landscape appearance

It functions independently of ecosystems

It links geology and ecology by releasing nutrients and supporting soil formation

4. Coal, petroleum, and natural gas are considered major carbon reservoirs because they ________________

Contain only inorganic carbon compounds

Are produced directly from atmospheric CO₂ each year

Store carbon that was fixed by photosynthesis millions of years ago

Continuously absorb atmospheric carbon dioxide

5. Which of the following best describes nutrient turnover in an ecosystem?

Nutrients are continuously recycled through living organisms and the environment

Nutrients are permanently removed from circulation by soil sediments

Nutrients are converted into rocks and stored underground

Nutrients flow in one direction from producers to decomposers

6. Lichens are ecologically important because they _________________

Prevent soil formation

Reduce mineral release

Immobilize nutrients permanently

Initiate rock weathering and soil development

7. Which of the following best explains why root hair cells are well adapted for absorption in plants?

They are covered in a thick waxy cuticle to prevent water loss

They have a large surface area and thin walls, facilitating efficient uptake of water and ions from soil

They are located above ground to access atmospheric moisture

They contain chloroplasts to produce energy for mineral uptake

8. Heavy rainfall following fertilizer application often leads to nutrient loss because ______________

It promotes weathering of bedrock

It converts nutrients into gases

It increases nutrient fixation in soil

It enhances leaching of soluble nutrients below the root zone

9. Which nutrient cycle is most dependent on weathering processes?

Phosphorus cycle

Carbon cycle

Oxygen cycle

Nitrogen cycle

10. Which of the following best explains why life on Earth is sustainable over geological timescales despite a fixed supply of nutrients?

Solar energy drives the continuous synthesis of new nutrient molecules from atmospheric gases

Nutrients cycle repeatedly through biotic and abiotic components via biogeochemical cycles, whereas energy cannot be recycled, and is continuously supplied by solar input

New nutrients are continuously generated through nuclear reactions in the Earth’s core

Nutrients are imported from space through meteorite impacts at a sufficient rate

Question 1 of 10

Nutrient Cycling MCQs (Quiz 8)

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