Rainfall more than 200 cm with a short dry season.
Explanation
Tropical Evergreen Forests are restricted to regions characterized by heavy precipitation and warm, humid conditions throughout the year. These forests are dense, multi-layered, and retain their green appearance year-round because there is no definite time for trees to shed their leaves.
Analysis of Climatic Conditions
- Rainfall: These forests thrive in areas having an annual rainfall exceeding 200 cm.
- Dry Season: They are adapted to regions with a very short dry season.
- Temperature: The mean annual temperature is consistently above 22°C.
- Distribution: In India, these forests are found in the western slopes of the Western Ghats, the island groups of Lakshadweep and Andaman & Nicobar, and the upper parts of Assam and the Tamil Nadu coast.
Option Analysis
- Rainfall between 100 cm and 200 cm with a long dry season. is incorrect: Rainfall between 100 cm and 200 cm is characteristic of Tropical Moist Deciduous Forests (e.g., Teak, Sal).
- Rainfall more than 200 cm with a short dry season. is correct: Rainfall exceeding 200 cm with a short dry season is the primary climatic requirement for Tropical Evergreen Forests (e.g., Ebony, Mahogany, Rosewood).
- Rainfall less than 70 cm with high humidity. is incorrect: Rainfall less than 70 cm supports Tropical Thorn Forests and scrubs found in semi-arid regions.
- Rainfall between 70 cm and 100 cm with cool winters. is incorrect: Rainfall between 70 cm and 100 cm is typical for Tropical Dry Deciduous Forests.
Key Takeaway: The defining climatic feature of Tropical Evergreen Forests is annual rainfall above 200 cm combined with high heat and humidity, distinguishing them from Deciduous forests which require less rainfall (70–200 cm).