Help with Questions to Macbeth : Act I, Scene 4-King Duncan and His Sons

Act I, Scene 4-King Duncan and His Sons

1. Why was the old Thane of Cawdor executed?
2. What is the meaning of the plant metaphor? See if you can spot further plant references.
3. What news does the King impart to Macbeth and what is Macbeth’s reaction to the news?
4. In his last speech in this scene, what does Macbeth reveal?