Q1. Data validation and Q2 alternative colours on mobile excel

Q1. How to set data validation on mobile(Android) excel?
Q2. how to set alternative colours(banded colours) in rows without inserting a table on mobile(Android) excel?
Q3. How to change alternative colours(banded colours) on mobile(Android) excel?

Please write A1., A2, and A3. before the answers.
Thank you.