Q1. Khejri (Prosopis cineraria), declared the state tree of Rajasthan, is ecologically significant primarily because it:
A Produces timber used in shipbuilding
B Fixes nitrogen in soil and provides fodder, fuelwood, and acts as a windbreak against desert spread Correct
C Is the primary source of natural rubber in western Rajasthan
D Is classified as a critically endangered species by IUCN
Explanation
Khejri (Prosopis cineraria) is a nitrogen-fixing tree vital to Rajasthan's arid ecology. It provides fodder for livestock, fuelwood, and acts as a natural windbreak, slowing desertification. It is NOT a rubber source, not used in shipbuilding, and while important, it is not classified as critically endangered.