Step 1: Observing the pollen diagram.
The diagram shows a pollen grain with a tube cell, a generative cell, and a germ pore.
Step 2: Identifying the pollen type.
Dicot pollen grains typically have three germ pores, whereas monocot pollen grains usually have a single germ pore.
Step 3: Conclusion.
The given pollen grain structure corresponds to that of a dicot plant.