Find out the correct sequence of sentences which are labelled as P, Q, R and S. Newton discovered that P. due to the gravitational pull Q. of the earth R. the apple falls S. on the ground The correct sequence should be

RSPQ. The "gravitational pull" is exerted by the earth. So, it is logical to place part $(\mathrm{Q})$ after $(\mathrm{P})$. Part-sequence PQ is mentioned only in option (2). The complete sentence is read by using option (2). The sentence is meaningful. The adverb phrase of place "on the ground" is positioned after the verb "falls". It is followed by part $(\mathrm{P})$ which mentions the reason.