Question:
Agroforestry can be used to improve degraded lands through their effects on
Agroforestry can be used to improve degraded lands through their effects on
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Trees are "Soil Doctors." They pump nutrients, add organic "medicine" (litter), and build soil "bones" (structure). Without soil improvement, no other benefit can happen on degraded land.
Updated On: Aug 7, 2026
- Improving wood production
- Improving agriculture production
- Improving income of farmer
- Improving soil property
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks for the primary biological effect of agroforestry that enables the reclamation or improvement of "degraded lands" (soils that are saline, alkaline, eroded, or nutrient-poor).
Step 2: Detailed Explanation:
• The Core Problem: Degraded lands are unusable primarily because of poor soil physics, chemistry, or biology.
• The Agroforestry Solution: Trees play a transformative role in improving soil properties (D) through:
- Nutrient Pumping: Deeper roots bring up nutrients from sub-soil to the surface.
- Organic Matter Addition: Leaf litter and root turnover add carbon, improving soil structure and microbial life.
- Biological Drainage: Trees remove excess groundwater to tackle salinity.
- Erosion Control: Root systems bind soil, and canopies break rainfall impact.
• Outcome vs. Effect: While options A, B, and C (wood, crop yields, and income) are all outcomes of agroforestry, they are only possible because the system first fixes the underlying soil properties. Therefore, (D) is the fundamental scientific effect on the land itself.
Step 3: Final Answer:
Improving soil properties is the direct mechanism by which agroforestry restores degraded lands.
The question asks for the primary biological effect of agroforestry that enables the reclamation or improvement of "degraded lands" (soils that are saline, alkaline, eroded, or nutrient-poor).
Step 2: Detailed Explanation:
• The Core Problem: Degraded lands are unusable primarily because of poor soil physics, chemistry, or biology.
• The Agroforestry Solution: Trees play a transformative role in improving soil properties (D) through:
- Nutrient Pumping: Deeper roots bring up nutrients from sub-soil to the surface.
- Organic Matter Addition: Leaf litter and root turnover add carbon, improving soil structure and microbial life.
- Biological Drainage: Trees remove excess groundwater to tackle salinity.
- Erosion Control: Root systems bind soil, and canopies break rainfall impact.
• Outcome vs. Effect: While options A, B, and C (wood, crop yields, and income) are all outcomes of agroforestry, they are only possible because the system first fixes the underlying soil properties. Therefore, (D) is the fundamental scientific effect on the land itself.
Step 3: Final Answer:
Improving soil properties is the direct mechanism by which agroforestry restores degraded lands.
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