| List- I I-V Characteristics  | List-II Diodes  | ||
|---|---|---|---|
| A | ![]()  | I | Solar Cell | 
| B | ![]()  | II | L.E.D | 
| C | ![]()  | III | Zener diode | 
| D | ![]()  | IV | Photo diode | 

Rearrange the following parts to form a meaningful and grammatically correct sentence: 
P. a healthy diet and regular exercise 
Q. are important habits 
R. that help maintain good physical and mental health 
S. especially in today's busy world