In the given question, the first and the last words or phrases of the sentence have been numbered 1 and 6.The rest of the sentence is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct and then mark the correct answer from the options given below.

1 - Tundra regions are

P - low plants like mosses and lichens

Q - the short summer

R - and

S - free from ice during

6 - grow abundantly