In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

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S1: What are the causes of our chronic food shortage ?
P : To find for these growing new millions is desperate task.
Q : every year, we add more than a crore of persons to our population.
R : Despite stupendous efforts by our government, the population is growing unabated.
S : The chief cause is the population explosion.
S6: This unprecedented growth can drag us to the doors of starvation very soon.
The Proper sequence should be: