In India, tropical rain forests are found in

Concept

A tropical rain forest — the tropical wet evergreen forest of the Indian forest-type classification — is defined by climate, not by administrative boundary. It develops where annual rainfall exceeds roughly 200 cm, the mean annual temperature stays near 24–27 °C, humidity is consistently high, and no long dry season interrupts growth. Under that regime trees remain broad-leaved and evergreen through the year and the canopy is dense and multi-storeyed.

Application

Applying those thresholds to India, the climate is met in three belts: the windward western slopes of the Western Ghats, the Andaman and Nicobar Islands, and the wetter hills of the north-east. Testing each state named in the options against that:

• Karnataka: the Western Ghats districts of Uttara Kannada, Shivamogga, Chikkamagaluru and Kodagu intercept the full south-west monsoon, receive high orographic rainfall, and carry wet evergreen forest.

• Kerala: the eastern highlands lie on the windward flank of the Ghats; Silent Valley, the Agasthyamalai hills and the Wayanad–Nilambur belt are classic wet evergreen tracts.

• Himachal Pradesh: a western-Himalayan state whose elevation-driven climate grades from subtropical pine through temperate deodar and oak to alpine pasture, with cold winters and strongly seasonal temperature and moisture regimes.

Cross-check

Two of the three states listed satisfy the tropical rain forest definition and one does not, so no single-state option covers the full picture. The correct response is therefore “More than one of Karnataka, Himachal Pradesh and Kerala”.

A note on published keys: some circulated answer keys for this paper mark only Kerala. The official forest-type records of the Wildlife Institute of India and of the Karnataka and Kerala forest departments both list tropical wet evergreen forest, so a single-state choice cannot be exclusively correct while the other state carries the same forest type.