Fundamentals of Plant Nutrition MCQs Quiz 17

1. Nitrification is the process of _______

 Incorporation of nitrogen into organic matter

 Conversion of nitrate to nitrogen gas

 Reduction of nitrate to ammonium

 Oxidation of ammonium to nitrate

2. High soil salinity affects nutrient uptake by ________________________

 Causing ionic imbalance

 Reducing precipitation

 Enhancing mineralization

 Increasing diffusion

3. Urea contains approximately _______ nitrogen

 30%

 21%

 18%

 46%

4. Decomposition of organic matter is mainly carried out by _______

 Fungi only

 Protozoa

 Aerobic microbes

 Anaerobic microbes

5. Biological nitrogen fixation in leguminous plants is primarily carried out by _______

 Rhizobium

 Blue-green algae

 All of these

 Fungi

6. High soil organic matter improves buffering capacity due to _______

 High reactivity

 Low surface area

 High bulk density

 Low microbial activity

7. A __________________________ is the factor that most strongly increases microbial nitrogen (N) demand in the soil

 High substrate C:N ratio (carbon-to-nitrogen ratio)

 Low substrate C:N ratio (carbon-to-nitrogen ratio)

 Low carbon availability

 High soil aeration

 Low temperature

8. Nutrient uptake by plant roots occurs through _______

 Passive transport

 Active transport

 Both active and passive transport

 None of these

9. Soil moisture influences nutrient availability primarily by affecting _______

 Bulk density

 Soil texture

 Soil color

 Nutrient mobility

10. Root interception contributes to nutrient uptake by _______

 Microbial breakdown

 Transport via water

 Direct root contact with nutrients

 Gas exchange

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Fundamentals of Plant Nutrition MCQs Quiz 17