Fundamentals of Plant Nutrition MCQs Quiz 15

1. Soil temperature affects nutrient dynamics by regulating  _______

 Soil density

 Microbial activity

 Soil structure

 Soil texture

2. Zinc (Zn) primarily functions in _______ in plants

 Respiration

 Enzyme activation

 Water absorption

 Cell wall formation

3. Soil fertility differs from soil productivity because it refers specifically to _______

 Nutrient-supplying capacity of the soil

 Crop yield

 Climatic conditions influencing growth

 Water availability in the soil

4. Which pool directly supplies nitrogen for microbial protein synthesis during decomposition?

 Mineral nitrogen (NH₄⁺, NO₃⁻)

 Rock minerals

 Organic polymers only

 Atmospheric N₂

5. Humification is the process of _______

 Loss of carbon as CO₂

 Formation of stable humus from organic residues

 Conversion of nitrate into nitrogen gas

 Complete mineralization of organic matter

6. In soil, potassium exists in _______ forms

 Only soluble

 Multiple forms

 Only fixed

 Only exchangeable

7. Immobilization refers to _______

 Conversion of inorganic nutrients into organic microbial biomass

 Release of nutrients from organic residues

 Loss of nutrients through leaching

 Fixation of nutrients in mineral lattices

8. Cation exchange capacity (CEC) is a measure of soil’s ability to _______

 Hold and exchange cations

 Buffer temperature

 Retain anions

 Increase porosity

9. Waterlogged soils promote nutrient loss through _______

 Leaching of calcium

 Fixation of potassium

 Denitrification of nitrogen

 Volatilization of phosphorus

10. Soil fertility differs from productivity because it refers to _______

 Nutrient supplying capacity

 Climate

 Crop yield

 Water availability

 Loading …

Question 1 of 10

Fundamentals of Plant Nutrition MCQs Quiz 15