Which of the following forests are grown in less than 50cm rainfall?

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[A] Montane forests

[B] Thorn forests

[C] Littoral and Swamp forests

[D] Tropical Deciduous forests

Answer: B

Notes:

Explanation: Tropical thorn forests occur in the areas which receive rainfall less than 50 cm.

These consist of a variety of grasses and shrubs.
It includes semi-arid areas of south west Punjab, Haryana, Rajasthan, Gujarat, Madhya Pradesh and Uttar Pradesh.

Source: NCERT – Fundamental of Physical Geography