1. Mohenjodaro, Harappa, Ropar and Kalibangan are the main sites of Indus valley civilization.
2. People of Harappa developed the road, proper housing and drainage system.
3. People of Harappa were unknown about the use of metals.
Correct Answer: (a) 1 and 2 are correct
Solution:Harappa, Mohenjodaro, Ropar, Lothal and Kalibangan are the main sites of Indus Valley Civilization. In this civilization, most of the cities were designed in a grid pattern. A proper drainge system was aligned along the roads, which was covered with big stones and bricks. The forms of art were found from various sites of this civilization including seals, pottery, gold ornaments and necklaces.