a) The ploughed fields have been found at Kalibangan site of Harappan Civilization.

b) A wooden furrow has been found, 7 fire altars in a row have been found and they suggest the practice of sacrifice and Bones of the camel have been found at Kalibangan.

c) The bricks used were earthen ones and were not as planned and also did not have a good drainage system.

• The Gateway of India was built in the early twentieth century in the city of Mumbai, Maharashtra.

• It was designed by the British architect, George Wittet.

• The foundation stone of the Gateway of India was laid down by the then Governor of Bombay  on March 31, 1913.

•  The Diwan-I-Insha was related to Department of correspondence during Sultanate Period.

•  The head of this department was Dabir-I-Mumalik.

•  All formal or confidential correspondence between the Sultan and the rulers of other states or subordinate chiefs, governors and officials was carried on by this department.

The Deccan Plateau is a large plateau in western and southern India forming a triangular shape. It is located between Eastern Ghat and Western Ghat. It is separated from Gangetic Plain by Satpura and Vindhyas Range. It passes through the following eight Indian States:

1) Maharashtra

2) Karnataka

3) Telangana

4) Andhra Pradesh

5) Tamil Nadu

6) Kerala

7) Odisha

8) Chhattisgarh

It covers 43% of Indian landmass.

Aravalli Range is a part of Central Highland, which extends from Delhi to Gujarat.

Sarkaria Commission was set up in 1983 by the central government of India. The Sarkaria Commission's charter was to examine the central-state relationship on various portfolios and suggest changes within the framework of Constitution of India. The Commission was named so as it was headed by Justice Ranjit Singh Sarkaria (Chairman of the commission), a retired judge of the Supreme Court of India. Therefore, the correct answer is option D.

Article 213 empowers the Governor to issue ordinances. The governor exercises the power when the assembly of that state and if there is also a Legislative Council in that state, then both the houses of the Legislature are not in session and the Governor is convinced that such circumstances exist when such action is necessary.

The Chairman and members of the Union Public Service Commission are appointed by the President, while the Chairman and members of the State Public Service Commission are appointed by the Governor. About half of the members of each Public Service Commission are individuals who have served under the Government of India or the State Government for at least 10 years.

International Museum Day is celebrated every year on 18 May.

The objective of International Museum Day , as declared by International Council of Museums(ICOM), is to raise awareness about the fact that, “Museums are an important means of cultural exchange, enrichment of cultures and development of mutual understanding, cooperation and peace among peoples.”

The theme for International Museum Day 2021 is ‘The Future of Museums: Recover and Reimagine’.

It is used in agriculture because it improves water holding capacity and soil aeration, thus increasing crop yield. It also contains micronutrients like phosphorus, potassium and calcium. - Fly ash is a proven resource material for many applications of construction industries and currently is being utilised in the manufacturing of Portland cement. Manufacturing of Absorbents that are suitable for purification of waste gases, drinking water purification, wastewater treatment, etc. A large quantity of ash is generated at coal/lignite based Thermal Power Stations, so it cannot generate electricity.

Plankton is a marine organism that floats on the water and drifts with the currents. Most planktons are too small to be seen with the naked eye. Phytoplanktons are plant-like planktons; they make food by photosynthesis. Phytoplanktons provide 50% of the oxygen on earth. Krill are a type of zooplankton which is the main food of marine animals, such as whales, seals, penguins, squid and fish, krill are one of the most abundant animal species.