Solution:National Commission for Schedule Tribes is constitutional body. Constitutional bodies are formed by the Constitution which helps the government to run properly.
UPSC, CAG, SPSC, Election Commission, National Commission for STs, National Commission for SCs, Finance Commission are some examples.
They derive power directly from the Constitution. National Commission for Women, National Commission for Minorities, National Human Rights Commission are statutory bodies created by law paved by Parliament.
Erstwhile Planning Commission, NITI Aayog, National Development Council are extra constitutional non-statutory bodies created by executive order.