Soil Health MCQs (Quiz 15)

Soil Health MCQs (Quiz 15)
Multiple Choice Questions for Professional Test Preparation

1. Excess phosphorus in soil may reduce the availability of ____________and _________ to plants

 Hydrogen and calcium

 Nitrogen and sulfur

 Carbon and oxygen

 Zinc and iron

2. Micronutrients are important for plants because they __________

 Decrease overall plant metabolic activity

 Support essential physiological functions even in very small amounts

 Can completely replace the need for macronutrients

 Are needed in large quantities by most crops

3. Biochar is mainly produced from controlled burning of __________

 Plastic

 Concrete dust

 Metal scraps

 Organic material under low oxygen

4. Poor soil aeration around plant roots directly leads to __________

 Higher rates of mineral nutrient absorption

 Increased root respiration and growth

 Enhanced oxygen diffusion into root tissues

 Suppressed root development and physiological stress

5. Excessive irrigation often causes nutrient loss through __________

 Evaporation

 Root respiration

 Photosynthesis

 Leaching beyond the rhizosphere

6. Farmers often apply phosphorus fertilizers during early crop growth primarily to ___________________

 Enhanced resistance to insect pests

 Regulate water evaporation from soil

 Promote rapid root system development

 Promote premature leaf shedding

7. Which gas is most essential for healthy root activity in well-aerated soil?

 Ammonia

 Carbon dioxide

 Hydrogen

 Oxygen

8. One of the earliest visible symptoms of potassium deficiency in plants is __________

 Thickened, brittle stems

 Yellowing or scorching along leaf margins

 Excessive or premature flowering

 Swollen, stunted root tips

9. Which organism plays a major role in improving soil biological fertility?

 Termites feeding on wood

 Nematodes causing root disease

 Rock-weathering minerals

 Nitrogen-fixing bacteria

10. What is a major advantage of biochar in light-textured soils?

 Increased soil salinity

 Reduced aeration

 Prevention of root growth

 Enhanced soil structure stability

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