Q5. Do all Compositae heads have both ray and disc florets?
No: lettuce heads have only strap-shaped florets, which are bisexual; Ageratum heads have only tubular florets.
Q6. Which florets of a sunflower head set fruit?
The disc florets; sunflower’s ray florets are sterile.
Q7. What job does the pappus do after fertilisation?
In many members, such as dandelion, the persistent hairy pappus stays on the fruit and carries it on the wind; in sunflower the pappus is two small scales that fall early.
Q8. Which leafy vegetable belongs to Compositae?
Lettuce.
Q9. How do synandrous stamens differ from syngenesious ones?
In synandrous stamens both anthers and filaments are united, as in Cucurbita; in syngenesious stamens (Compositae) only the anthers are.
Q10. In marigold, are the ray florets female, male or sterile?
Female (pistillate).