* Water is called the "universal solvent" because it dissolves more substances than any other liquid.

* This is important to every living thing on earth.

* Water is capable of dissolving a variety of different substances, which is why it is such a good solvent.

● Poliomyelitis, commonly shortened to polio, is an infectious disease caused by the poliovirus. The virus spreads from person to person and can infect a person’s spinal cord, causing paralysis and he can’t move parts of the body.

● India received polio-free certification by the WHO in 2014. This achievement has been spurred by the successful pulse polio campaign in which all children were administered polio drops. The last case due to wild poliovirus in the country was detected on 13^th January 2011.

• Each of the ruling dynasties in the history of India ruled over a specific area.

• They also tried to control other fertile, strategic & important regions.

• Kannauj was an important city in the Ganga valley.

• The rulers of three dynasties, i.e., the Gurjara-Pratihara, Rashtrakuta and Pala fought for centuries to control the city.

• As there were three parties involved in the struggle, it was popularly called the “tripartite struggle”.

During the Gupta period, the sun was called Lokarka. The Gupta period developed a form of sculpture that was wholly Indian, the foreign influences that had crept in the Gandhara and Mathura schools of arts disappeared. Most sculptures focused on religious and spiritual themes, like the Buddha or Hindu gods like Vishnu and Shiva. The art had been highly developed and the sculptures were exquisite.

• The Anti-Defection Law was passed on 15^th February 1985.

• It was passed through the 52^nd Amendment to the Constitution.

• The 52^nd Amendment added the Tenth Schedule to the Indian Constitution.

• The main intent of the law was to combat “the evil of political defections”.

• The tenth schedule of the Indian Constitution is also called the ‘Anti-Defection act'.

• The Liberalization, Privatization and Globalization(LPG) model of development introduced by Prime Minister P. V. Narasimha Rao and his then-Finance Minister Dr. Manmohan Singh.

• The economic liberalisation in India denotes the continuing financial reforms which began since July 24, 1991.

Some of the Articles related to Vice-President are:

• Article 66- Election of Vice-President

• Article 67- Term of office of Vice-President

• Article 68- Time of holding election to fill vacancy in the office of Vice-President and the term of office of person elected to fill casual vacancy

• Article 69- Oath or affirmation by the Vice-President

• Article 70- Discharge of President’s functions in other contingencies

Thus, option D is correct.

Digboi refinery is known as the birthplace of the Oil Industry in India. It was commissioned on 11 December 1901. It has the distinction of being Asia's first refinery and one of the oldest still in operation. Oil was accidentally discovered in 1867 while laying a railway line in Digboi area. It was just found seeping out in dense jungles in Tinsukia district. Digging for oil was started in 1889 and the refinery was set up in 1901 at Digboi.