Which of the following statements are true about the Rajasthan desert? Use the code given below to select the correct answer?

1. It is the most densely populated desert of the world.

2. It is about 10,000 years old mainly caused by excessive human interference.

3. Here only 40 to 60 percent of the area is suitable for farming.

4. The increase in net sown area has adversely affected the coverage of grazing lands.

Code :

U.P.P.C.S. (Pre) 2008