Fundamentals of Plant Nutrition MCQs Quiz 9

1. C:N ratio in soil is defined as _______

 Ratio of organic matter to assimilated nitrogen

 Ratio of microbial biomass to nitrogen

 Ratio of nitrogen to carbon

 Ratio of organic carbon to total nitrogen

2. _______ is a widely used synthetic organic nitrogen fertilizer

 Urea

 Ammonium nitrate

 SOP

 DAP

3. Under flooded rice conditions, the availability of _______ increases

 All elements

 Chromium

 Iron

 Sodium

4. An element that improves plant growth but does not meet essentiality criteria is _______

 Limiting nutrient

 Macronutrient

 Beneficial

 Essential

5. Oxygen deficiency in soil affects nutrient dynamics primarily by altering _______

 Soil texture

 Cation Exchange Capacity

 Soil density

 Redox reactions

6. Death of terminal buds in plants is a typical symptom of _______ deficiency

 Sulfur

 Magnesium

 Nitrogen

 Calcium

7. Soils with high clay content are more susceptible to phosphorus ___________

 Leaching

 Erosion

 Volatilization

 Fixation

8. The primary bacteria responsible for nitrification are ______________

 Heterotrophic

 None of these

 Autotrophic

 Detritivores

9. Which element is beneficial for nitrogen-fixing bacteria in legumes but not essential for all plants?

 Sulfur

 Cobalt

 Calcium

 Magnesium

10. Potassium is considered a _______ element within plants

 Fixed

 Immobile

 Mobile

 Inert

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