Read the passage and answer the question:

"Indigenous agroforestry systems, such as the multi-layered forest gardens of Southeast Asia, cultivate fruit trees, timber, and medicinal plants concurrently. Unlike industrial monocultures that exhaust soil nutrients, these polycultural systems mimic natural rainforest canopy layers, maintaining soil microbial biomass and providing sustained year-round harvests."

Why are indigenous agroforestry systems more sustainable than industrial monocultures?

Answer and explanation

Correct answer: D. They mimic natural canopy layers and maintain soil microbial health

  1. Step 1: Locate the comparative advantage: 'Unlike industrial monocultures that exhaust soil nutrients, these polycultural systems mimic natural rainforest canopy layers, maintaining soil microbial biomass'.
  2. Step 2: The sustainability stems from biomimicry of natural forest stratification and preserving soil biology.
Answer
They mimic natural canopy layers and maintain soil microbial health.
Why not the others: 'They require complete clear-felling of all native forest trees' describes destructive clear-cutting; 'They rely exclusively on synthetic chemical nitrogen fertilizers' contradicts ecological organic nutrient cycling; 'They harvest a single commercial crop variety during one seasonal week' describes monoculture.

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