In this question there is six sentences of a passage. The first and sixth sentences are given in the beginning as S1 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 : The ecosystem of water is complex and many environmental factors are intricately linked. S6 : The trees slowly transfer rainwater into the sub-soil and this is critical for sustaining water for months after the rains. P : Thick forests make for excellent catchments. Q : The problems we see are because we have undermined these links over decades. R : First, rain and snowfall are the only sources of water – about 99%. S : In the four months of monsoon, there are about 30–35 downpours and the challenge is to hold this water in systems that can last us over 365 days.