Financial Background
If you belong to a place where you had no access to certain resources but still managed to study hard, do include this in your SOP.
Extracurricular Activities
Mention your achievements and participation in state or national level activities such as Sports, Arts and Debate.
Work Experience
Unlike MBA it is not mandatory to add work experience in other degrees but including any work experience is a good idea.
Published Work
Yes, it is important for PG programs but you can always include your previous research papers or any published report for your UG SOP.