Nutrient Cycling MCQs (Quiz 2) Posted on May 30, 2026Author agropublishers 0 1. What is the direct product of ammonification? Ammonia or ammonium ions (NH₃ / NH₄⁺) Nitrate ions (NO₃⁻) Nitrogen gas (N₂) Nitrite ions (NO₂⁻) 2. Weathering helps nutrient cycling by ______________________ Converting nutrients into organic matter Destroying soil nutrients Producing atmospheric oxygen Releasing minerals from rocks 3. _____________ is called decomposition Conversion of nitrates into nitrogen gas Breakdown of dead organic matter into simpler substances Formation of sedimentary rocks Storage of nutrients in plants 4. What is the final product of denitrification in the nitrogen cycle? Water and Nitrate ions Ammonium ions Nitrite ions Nitrogen gas 5. In an ecosystem, a trophic level represents ______________ A type of nutrient cycle A nutrient reservoir A feeding position in a food chain A soil horizon 6. Producers are organisms that ________________ Break down dead organic matter Consume decomposers Synthesize organic food from inorganic substances Feed on other organisms 7. In the context of nutrient cycling, assimilation is best defined as ____________________________ The release of minerals from rocks through weathering The uptake and incorporation of inorganic nutrients into organic biological molecules The loss of nutrients from soil through leaching The discharge of nutrients into surrounding water bodies 8. Nitrification refers to the bacterial conversion of _________________ Organic nitrogen into amino acids Nitrogen gas into ammonia Nitrates into atmospheric nitrogen Ammonia into nitrites and then nitrates 9. _____________ of the following is a biotic component of an ecosystem Soil Bacteria Water Air 10. In nutrient cycling, a nutrient source is best described as ________________________ A component of an ecosystem that releases nutrients into the environment A region where nutrients are permanently locked away A geological formation with no mineral content A storage reservoir that neither gains nor loses nutrients Loading … Question 1 of 10
