Explanation:

Carissa carandas (distant cousin of Carissa Kopilli) , was also among several thorny plants the British had grown 140 years ago for a 1,100-mile barrier apparently to enforce taxes and stop the smuggling of salt.
Uses: Carissa Carandas has been used as a traditional herbal medicine for a number of ailments such as diarrhoea, anaemia, constipation, indigestion, skin infections and urinary disorders.The leaves have been used as fodder for silkworms while a paste of its pounded roots serves as a fly repellent.

Note: Normally Carissa Carandas flourishes well in regions with high temperatures. Thus, it is found in abundance in Western Ghats of Konkan region in the western coastal states of Maharashtra and Goa. Nevertheless, it grows naturally even in the temperate conditions of Siwalik Hills of Himalayas in India and Nepal at elevations of 30 to 1,800 metres (98 to 5,906 ft).Hence statement 3rd is incorrect.