Directions: In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences (P, Q, R, S) have been jumbled. Find the proper sequence.
S1: In 1668 an important discovery was made.
S6: That was the beginning of the end of the theory of spontaneous generation of higher plants and animals.
P: He put some rotting meat and fish in open jars and watched them.
Q: When he covered the jars with muslin, he found that flies came and laid their eggs on the muslin, but no maggots developed on the meat.
R: In time, he noticed that flies came and laid their eggs in the meat and the maggots hatched from the eggs.
S: An Italian physician named Redi decided to test the idea that worms were generated spontaneously in rotting meat.
- AP Q S R
- BS P R Q
- CS R P Q
- DR P Q S
Explanation
S introduces Redi; P-R describe the open-jar observation; Q the covered-jar control, leading to S6.