world economic industry trade agriculture section 6 MCQ Questions & Answers Detailed Explanation

Answer: (c)

Answer: (a)

Cultivation of rubber in Brazil, its native habitat, was severely hindered by blight in the early 20th century. At present, most of the world’s natural rubber is produced by rubber trees descended from rubber seedlings transplanted from South America to south and southeast Asia.

The most severe disease is South American Leaf Blight (SALB). This disease is endemic throughout the rubber growing areas in the Americas. It also poses a major global threat. The fungus can be controlled by a number of fungicides.

Some species are not susceptible to the disease, and some strains of susceptible species are resistant. Crown budding or grafting of resistant plants onto productive trees can be used to control spread.

Answer: (c)

Answer: (a)

Shifting cultivation is an agricultural system in which plots of land are cultivated temporarily, then abandoned and allowed to revert to their natural vegetation while the cultivator moves to another plot.

Answer: (d)

The worst oil spill in history wasn’t an accident — it was deliberate. During the Gulf War in 1991, as Iraqi forces retreated from Kuwait, they opened the valves of oil wells and pipelines in a bid to slow the onslaught of American troops.

The result was the largest oil spill history has seen. Some 240 million gallons of crude oil flowed into the Persian Gulf.

Answer: (a)

1. Shangai is famous for shipbuilding,
2. Chicago for Cotton textile,
3. Sheffield for Engineering and
4. Yokohama for Iron & Steel.