In this section, each item consists of six sentences of a passage. The first and sixth sentences are given as SI and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly.

S1: Plains are large stretches of flat land

P: Some plains are extremely level. 

Q: Others may be slightly rolling and undulating.

R: Most of the plains are formed by rivers and their tributaries.

S: These flat lands are, generally, not more than 200 metres above mean sea level.

S6 Then they deposit their load consisting of stones, sand and silt along their courses and in their valleys.