The correct option is 23.5° N to 23.5° S.
Explanation
The Earth is divided into distinct climatic zones based on latitude and the angle of solar insolation. The tropical zone is the region surrounding the Equator, characterized by warm temperatures year-round and high levels of biodiversity.
Option Analysis:
- 23.5° N to 23.5° S is Correct: The tropical zone is geographically defined as the latitudinal range between the Tropic of Cancer (23.5° N) and the Tropic of Capricorn (23.5° S). This zone receives the most direct sunlight and includes biomes such as tropical rainforests, which harbor the highest biodiversity on Earth.
- 0° to 90° N is Incorrect: The range from 0° to 90° N encompasses the entire Northern Hemisphere, including tropical, temperate, and polar regions.
- 10° N to 10° S is Incorrect: The range from 10° N to 10° S defines the equatorial zone (or doldrums). While this is the core of the tropics, the full tropical zone extends further north and south to the tropics of Cancer and Capricorn.
- 30° N to 60° N is Incorrect: The range from 30° N to 60° N corresponds to the temperate zone, which experiences distinct seasons and moderate temperatures compared to the tropics.
Key Takeaway: The tropical zone, distinguished by high biodiversity and consistent warmth, extends strictly from 23.5° N to 23.5° S.