Soil Health MCQs (Quiz 7)

Soil Health MCQs (Quiz 7)
Multiple Choice Questions for Professional Test Preparation

1. Which process mainly occurs in the rhizosphere?

 Complete absence of nutrient exchange

 Formation of igneous rocks

 Long-term groundwater storage

 Interaction between plant roots, soil, and microorganisms

2. Plant-available water is generally found between __________________

 Bedrock and groundwater table

 Saturation point and runoff level

 Soil crust and surface litter

 Field capacity and permanent wilting point

3. A high microbial carbon use efficiency generally indicates _________________

 Complete absence of respiration

 Greater soil erosion

 More carbon retained in microbial biomass

 Reduced microbial activity

4. Mineral-associated organic carbon is highly stable because it _______________________

 Prevents all microbial activity

 Exists only in dry soils

 Decomposes immediately after formation

 Is protected through interactions with soil minerals

5. The addition of fresh plant residues to soil may stimulate microorganisms to _____________

 Increase decomposition of older organic matter

 Reduce enzyme activity

 Eliminate soil carbon completely

 Stop nutrient cycling

6. One important benefit of adding biochar to soil is _____________-

 Reduced soil fertility

 Increased soil erosion due to poor soil aggregation

 Improved water retention

 Restricted use by microorganisms

7. One major benefit of regenerative agriculture is its ability to _________________

 Reduce organic matter in soil

 Increase greenhouse gas emissions

 Eliminate all insects from farms

 Capture and store atmospheric carbon in soil

8. A farmer practicing regenerative agriculture notices compacted soil on a grazing paddock. Which action best aligns with regenerative principles?

 Leave the paddock fallow for two full growing seasons

 Deep plow the field to break up compaction immediately

 Introduce high-density, short-duration rotational grazing

 Apply synthetic nitrogen fertilizer to boost plant growth

9. Which of the following combinations best serves as a direct indicator of high soil biodiversity, rather than just a single component?

 High abundance of one dominant earthworm species and low fungal activity to retain organic matter

 High total microbial biomass and acidic pH

 High richness of invertebrate and microbial taxa, along with a wide range of functional groups

 High bulk density and low water infiltration rate

10. ___________________ is most vulnerable soil carbon pool to rapid microbial decomposition

 Deep subsoil carbon

 Fresh plant litter

 Humified stable carbon

 Mineral-associated organic carbon

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