Which statement best contrasts intensive subsistence farming with shifting cultivation in tropical regions?

• A. Intensive subsistence uses small plots year-round with high labor input; shifting cultivation cycles land use with long fallow periods after clear-cutting forests.
• B. Intensive subsistence uses large mechanized farms; shifting cultivation relies on irrigation and modern inputs.
• C. Intensive subsistence involves leaving land fallow for many years; shifting cultivation uses permanent fields.
• D. Intensive subsistence is common in arid regions; shifting cultivation is common in temperate regions.

Answer: (A)

The main idea is how land is used over time and how much labor is invested to get crops. Intensive subsistence farming in the tropics focuses on squeezing as much output as possible from small plots through a lot of human labor, year-round, often with multiple crops grown on the same land to maximize yield despite limited space. Shifting cultivation, by contrast, clears a patch of forest and farms it for a few years until the soil’s nutrients are depleted, then moves on to a new patch and lets the old one lie fallow for a long period to recover. This long fallow cycle is a defining feature that keeps soil fertility up in tropical, nutrient-poor soils.

So the statement that best contrasts the two is that intensive subsistence uses small plots year-round with high labor input, while shifting cultivation cycles land use with long fallow periods after clear-cutting forests. This captures why one system is highly labor-intensive on limited land, and the other relies on moving land and long recoveries to sustain productivity.