A layer in the Earth’s atmosphere called Ionosphere facilitates radio communication. Why?

1. The presence of ozone causes the reflection of radio waves to Earth.
2. Radio waves have a very long wavelength.

Which of the statements given above is/are correct?

If a tropical rainforest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because -

What could be the main reason/reasons for the formation of African and Eurasian desert belt?

1. It is located in the sub-tropical high-pressure cells.
2. It is under the influence of warm ocean currents.

Which of the statements given above is/are correct in this context?

India is regarded as a country with “Demographic Dividend”. This is due to:

The Brahmaputra, Irrawaddy and Mekong rivers originate in Tibet and flow through narrow and parallel mountain ranges in their upper reaches. Of these rivers, Brahmaputra makes a “U” turn in its course to flow into India. This “U” turn is due to -

Westerlies in the southern hemisphere are stronger and persistent than in northern hemisphere. Why?

1. The Southern hemisphere has less landmass as compared to the Northern hemisphere.
2. Coriolis force is higher in Southern hemisphere as compared to the Northern hemisphere

Which of the statements given above is/are correct?

Between India and East Asia, the navigation-time and distance can be greatly reduced by which of the following?

1. Deepening the Malacca Straits between Malaysia and Indonesia.
2. Opening a new canal across the Kra isthmus between the Gulf of Siam and Andaman sea.

Which of the statements given above is/are correct?

La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino?

1. La Nina is characterised by unusually cold ocean temperature in the equatorial Indian Ocean whereas El Nino is characterised by unusually warm ocean temperatures in the equatorial Pacific Ocean.
2. El Nino has an adverse effect on south-west monsoon of India, but La Nina has no effect on monsoon climate.

Which of the statements given above is/are correct?

Two important rivers — one with its source in Jharkhand (and known by a different name in Odisha), and another, with its source in Odisha — merge at a place only a short distance from the coast of the Bay of Bengal before flowing into the sea. This is an important site of wildlife and biodiversity and a protected area. Which one of the following could be this?

The lower Gangetic plain is characterized by a humid climate with high temperature throughout the year. Which one among the following pairs of crops is most suitable for this region?

A state in India has the following characteristics:

1. Its northern part is arid and semi-arid.
2. Its central part produces cotton.
3. Cultivation of cash crops is predominant over food crops.

Which one of the following states has all of the above characteristics?

The jet aircraft fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?

1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.

Which of the statements given above is/are correct in this context?

Among the following States, which one has the most suitable climatic conditions for the cultivation of a large variety of orchids with minimum cost of production, and can develop an export-oriented industry in this field?