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