In each of the questions, four alternatives are given for the Idiom/Phrase. Choose the alternative which best expresses the meaning of the Idiom/Phraseand click the button corresponding to it.
Dr Kailasavadivoo Sivanis an Indian space scientist and the chairperson of theIndian Space Research Organization.He is the former Director ofVikram Sarabhai Space Centerand Liquid Propulsion centre.He is joinedthis position Jan2018.
The method of soil conservation in which stones, grass, soil are used to build barriers along contours and trenches are made in front of the barriers to collect water is called?