Detailed Solution:

The correct answer is “Bhimal”.

In Uttarakhand, the Bhimal tree (Grewia optiva) is considered a farmer's best friend due to its multiple benefits. It provides fodder for cattle, fiber for various uses, and its wood can be used for fuel and other purposes. The Bhimal tree is an established agroforestry species in the region, helping reduce farmers' dependence on forests.

Another important tree for Uttarakhand farmers is the Banj oak (Quercus leucotrichophora), known for its utility and presence in the Himalayas.