Concept:The embryo of a flowering plant contains a plumule and a radicle.
The plumule is the part that forms the shoot system.
Explanation:The plumule is the embryonic shoot present in the seed.
It grows upward to produce the stem and leaves, which form the shoot system.
The radicle grows downward to form the root system.
Cotyledons store food, while the endosperm provides nutrition to the embryo.
Hence, the shoot system develops from the plumule of the seed's embryo.
Answer:B. plumule.