Final answer:
The slow and lyrical movement in a Romantic symphony is the Second movement.
Step-by-step explanation:
The movement of the Romantic symphony that is slow and lyrical in nature but varies in mood is the Second movement. This movement is typically characterized by its expressive melodies, flowing rhythms, and emotional depth. It often provides a contrast to the faster and more energetic first and third movements of a symphony. An example of a famous slow and lyrical second movement is the Adagio movement of Beethoven's Symphony No. 9.