Which of the following statements are correct about Amazon basin ? (a) This…

The Amazon basin lies on the equator and is a classic equatorial tropical-rainforest biome: it stays hot and wet in every month with no distinct dry season, its heavily leached soils lose fertility quickly, making continuous cultivation on one plot difficult, and its dense forest cover with limited road connectivity means aircraft and helicopters play an important role in reaching many settlements, alongside the basin's extensive river transport. These three traits — climate, soil-driven farming method, and transport — decide whether each statement about life in the basin holds.

• (a) Hot and wet climate throughout the year holds: sitting in the equatorial low-pressure belt, the basin gets convectional rainfall in every month, so there is no winter or dry season.

• (b) Slash-and-burn agriculture holds: because the leached soils lose fertility quickly and make continuous cropping on one plot difficult, communities clear and burn a patch, farm it for a few seasons, then move to a fresh patch.

• (c) Paddy as the main crop fails: cassava (manioc) is the staple crop of Amazonian shifting cultivators — alongside crops such as maize and pineapple — not paddy; paddy is instead the dominant crop of the fertile, monsoon-fed Ganga–Brahmaputra plains that most textbooks contrast the Amazon basin with.

• (d) Aircraft and helicopters for transport holds: dense forest cover and limited road connectivity make aircraft and helicopters a useful way to reach many settlements, alongside the basin's extensive river transport.

This matches the standard textbook contrast: the Ganga–Brahmaputra basin's monsoon-fed alluvial plains grow paddy as the dominant crop, while the Amazon basin's shifting cultivators rely on cassava (manioc) — confirming that the paddy claim, and only the paddy claim, is false here.

So only (a), (b) and (d) are correct.