Which of the following statements about tropical rainforest characteristics is INCORRECT?

Explanation

Option C is incorrect because it turns a common concentration zone into an absolute boundary. NASA's rainforest biome page places rainforest location between the Tropic of Cancer and the Tropic of Capricorn, and describes tropical rainforests as closer to the equator, warm, moist and rainy through the year. Tropical rainforests are densest near the equator, especially around 10°N to 10°S, but are not confined to that belt. Where year-round rainfall persists, including through orographic rainfall or trade-wind moisture, rainforest conditions can extend roughly 15°-20° from the equator. The error in option C is the word "exclusively", not the idea that equatorial areas are the core zone.

Why the other options are wrong

• (A) This is a true statement, because buttress roots help tall rainforest trees remain mechanically stable in shallow, nutrient-poor tropical soils.
• (B) This is a true statement, because lush rainforest growth depends on rapid nutrient cycling in biomass and litter, while the soils themselves are typically poor and quickly lose fertility after clearing.
• (D) This is a true statement, because year-round warmth, solar radiation and abundant moisture give tropical rainforests extremely high Net Primary Productivity among terrestrial biomes.

Concept

This tests world geography knowledge of tropical rainforest distribution and biome characteristics. RAS repeats this concept because candidates often memorise equatorial location bands and miss the climatic controls behind them.

Source

• NASA Science: Mission: Biomes - Rainforest

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