-Opening of Suez Canal further intensified British control over indias foreign trade

why?

This particular answer has been covered in the study material for Economics-XI at our site. Follow the link provided below. Also, go through the videos, which will help you to have a better grip over the concept. 

http://cbse.meritnation.com/cbse-economics-indian-economic-development/unit-i-indian-economy-on-the-eve-of-independence/442/2483/studymaterials.html#6363