What is the flower that stands for: silence?

Questions

- A note, usually in the bass, which is held below changing harmonies above, with which it may be discordant.?

- A five note scale, the commonest being without minor seconds (e.g. CDEGA-C...).?

(It.) - By, through, for (e.g. per archi, for strings).?

(It., 'losing itself') - Gradually dying away.?

- A cadence with the chord progression consisting of the dominant (chord V) to the tonic (chord I) which has a 'complete' sound.?