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Q41 (NDA-II/2009) Geography › Indian Physical Geography › Natural vegetation zones Answer Verified

What is the sequential order of vegetation types; observed while moving from Assam Valley to’ Rajasthan Plains?

Result
Your answer: —  ·  Correct: A
Explanation

The sequential order of vegetation from the Assam Valley to the Rajasthan Plains follows a gradient of decreasing annual rainfall from east to west. The Assam Valley and northeastern hills receive heavy precipitation (over 200-250 cm), supporting Tropical Wet Evergreen forests [c1, t2, t7]. As one moves westward into the Indo-Gangetic plains and the northern Indian plateau, rainfall decreases to 100-200 cm, leading to Tropical Moist Deciduous forests [c1, t7]. Further west into Uttar Pradesh and eastern Rajasthan, where rainfall is between 70-100 cm, Tropical Dry Deciduous forests predominate [c1, c4]. Finally, the arid Rajasthan Plains, characterized by low rainfall and high evaporation, are dominated by Tropical Thorn forests consisting of cacti and thorny shrubs [c1, c2, t6]. This sequence (Evergreen → Moist Deciduous → Dry Deciduous → Thorn) perfectly mirrors India's hygroscopic transition from the humid east to the arid west.

Sources

  1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > social relevance of forests > p. 21
  2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 9: Indian Biodiversity Diverse Landscape > r) Peninsular trndia > p. 159
  3. [3] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 5: Natural Vegetation > Tropical Deciduous Forests > p. 44
  4. [4] https://ncert.nic.in/textbook/pdf/kegy105.pdf
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