Question

write about the throny forests

Answer 1

The Thorn Forests are found in the semi-arid areas of Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Uttar Pradesh and Haryana.

The Thorn Forests and Scrubs are found in regions where the rainfall is less than 70cm.
The vegetation in these forests are thorny trees and bushes.
Acacias, palms, euphorbias and cacti are the main plants found in these forests.

Trees are scattered and have long roots penetrating deep into the soil in order to get moisture.
The stems are succulent to conserve water
Leaves are modified into spines (thorns) and are small to minimize transpiration.  

Answer 2

A thorny forest is a dense, scrublikevegetation characteristic of dry subtropicaland warm temperate areas with a seasonal rainfall averaging 250 to 500 mm (9.8 to 19.7 in). 
Hope it helps