UPSC Prelims GS - 2022

Question 49
EASYCorrect: +2Incorrect: -2

"Biorock technology" is talked about in which one of the following situations?

    a
    Restoration of damaged coral reefs
    b
    Development of building materials using plant residues
    c
    Identification of areas for exploration/extraction of shale gas
    d
    Providing salt licks for wild animals in forest/protected areas