In the following question, the first and the last parts of the sentence/passage are numbered 1 and 6. The rest of the sentence/passage is split into four parts - P, Q, R, and S. These four parts are not given in their proper order. Read the sentence/passage and find the most logical order of the parts between 1 and 6.
1. Plants need sunlight to grow.
P: Photosynthesis needs light.
Q: No food is made without it.
R: Leaves turn yellow without it.
S: The plant dies slowly.
6. Sunlight is very important.

(1) sets the context: plants require sunlight for growth.

P explains the reason scientifically: photosynthesis needs light.

Q logically follows because it refers to photosynthesis: without it (photosynthesis/light), no food is made.

R comes next as a visible effect of no food/sunlight: leaves begin to turn yellow.

S is the final consequence: the plant dies slowly.

(6) works as the concluding statement summarizing the whole idea: sunlight is very important.