UPSC Government Jobs Exams

The double helical structure of DNA was discovered by [UPSC 2008]

Watson and Crick
Watson and Khurana
Crick and Khurana
Watson and Morgan

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UPSC Other Question
The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge? [UPSC 2011 (CS-P)]

The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live not venture out
The mangroves provide both food and medicines which people are in need of after any natural disaster.
The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami
The mangrove trees do not get uprooted by storms and tides because of their extensive roots The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?[UPSC 2011 (CS-P)]

Presence of prominent tropospheric turbulence; and inflow of chlorofluorocarbons
Presence of prominent polar front and stratospheric clouds; and inflow of chlorofluorocarbons.
Absence of polar front and stratospheric clouds; and inflow of methane and chlorofluorocarbons.
Increased temperature at polar region due to global warming