Which one of the following regions of India has a combination of mangrove forest, evergreen forest and deciduous forest?

The correct answer is D, Andaman and Nicobar Islands. These islands sit in the tropical zone with heavy rainfall and a warm, humid climate. Their coasts carry mangrove patches, the wetter hill slopes and interior carry tropical evergreen forest, and the drier parts carry moist deciduous forest. All three forest types occur together in one region, which is why this option fits.

• A) North Coastal Andhra Pradesh: Wrong. It has deciduous and scrub vegetation and some coastal mangroves at the Godavari delta, but tropical evergreen forest is not a feature of this region.
• B) South-West Bengal: Wrong. The Sundarbans are mangroves, mostly in the south-east of Bengal. The region lacks a true evergreen forest belt, so the combination fails.
• C) Southern Saurashtra: Wrong. It is dry, with thorn and dry deciduous scrub. Its mangroves are small coastal stands in the Gulf of Kutch and Jamnagar area, and evergreen forest is absent.

The core concept is forest classification by rainfall and latitude, as in the Champion and Seth scheme. For Mains, Andaman's forests are a key case study in island biodiversity, coastal regulation and the balance between development and forest conservation.

Trap: Candidates pick mainland coastal states because mangroves are familiar there, and forget that evergreen forest needs very high rainfall.