Complete flower:
A complete flower is the one which has all four whorls: calyx, corolla, androecium and gynoecium e.g. Rose.
As this flower contains both male and female reproductive organs, it can produce both male and female gamete.
They do not depend on pollinators for pollination.
Incomplete flower:
These flowers have three whorls: calyx, corolla and either androecium or gynoecium.
These flowers can only produce one type of gamete ( male/female).
Example: Begonia.
Final Answer:
Flowers having calyx, corolla, stamen and pistil are complete flowers.
Flowers having calyx, corolla and androecium/gynoecium are incomplete flowers.
