Question 4
A bulbil is formed by the modification of which structure?
The right answer is the one marked above.
A vegetative bud or a floral bud. The bud thickens into a small self-contained package with a food store, then detaches and grows into a new plant.
The floral case is the interesting one: the plant begins building a flower, the structure for sexual reproduction, and converts it into a bulbil that reproduces asexually instead. No seed is involved at any point, which rules out a seed.