Fundamentals of Plant Nutrition MCQs Quiz 16

1. Mineralization refers to _______

 Release of nutrients from organic matter

 Leaching of nutrients

 Conversion of inorganic nutrients to organic forms

 Nutrient fixation

2. _____________ is the most susceptible nutrient to leaching in sandy soils

 Zinc

 Ammonium

 Phosphorus

 Nitrate

3. Biological nitrogen fixation refers to _______

 Oxidation of ammonium to nitrate

 Conversion of nitrate into nitrogen gas

 Conversion of atmospheric nitrogen into ammonia

 Release of nitrogen from organic matter

4. Which component of microbial cells has the highest nitrogen requirement?

 Starch

 Lipids

 Proteins

 Cell wall polysaccharides

5. Microbial immobilization of nitrogen_________________ plant-available nitrogen

 Temporarily Increases

 Temporarily Decreases

 Temporarily Stabilizes

 Permanently Eliminates

6. Soil buffering capacity refers to _______

 Ability to retain water

 Resistance to erosion

 Resistance to pH change

 Ability to retain nutrients

7. Potassium (K⁺) does NOT form a structural component of _______

 Enzyme activation

 Enzymes

 Chlorophyll

 Osmotic balance

8. Mass flow of nutrients in soil primarily depends on _______

 Nutrient Fixation

 Plant Photosynthesis

 Plant Respiration

 Plant Transpiration

9. Volatilization in soils refers to _______

 Loss of nutrients in gaseous form to the atmosphere

 Fixation of nutrients within soil mineral lattices

 Leaching of soluble nutrients beyond the root zone

 Microbial immobilization of nutrients into biomass

10. Plant roots modify rhizosphere pH primarily through _______

 Ion exchange

 Ion fixation

 Transpiration

 Photosynthesis

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Fundamentals of Plant Nutrition MCQs Quiz 16