ANSWER : qppqr

Explanation : . pqr/qrp/rpq/pqr/qrp. In each block, 1st letter is taken to the end of the block of three letters.

ANSWER : rstpq

Explanation : . The last letter of each block of five letters is brought in the beginning in the next block.

ANSWER : abxyz

Explanation : . abxyz/bxazy/xabyz/abxzy. In each repetition 1st letter of previous block is taken to 3rd place, and positions of 4th and 5th are interchanged.

ANSWER : abbbb

Explanation : .The pattern is ab/abb/abbb�������

ANSWER : pmnmp

Explanation : . The block of letters npm has been repeated.