Why is Welwitschia unique?

Answer:

It has two leaves.
Discussion:
An adult welwitschia consists of two leaves, a stem base and roots. That is all! Its two permanent leaves are unique in the plant kingdom. They are the original leaves from when the plant was a seedling, and they just continue to grow and are never shed.
  Pola Konsumsi, Tingkat Konsumsi Masyarakat Kota