The correct option is (D) Micropyle
The micropyle is a structure found in the ovule, which is part of the female reproductive organ of the flower. The micropyle is a small opening in the integuments (protective layers) of the ovule through which the pollen tube grows during fertilization to deliver the male gametes (sperm cells) to the embryo sac.
Therefore, the micropyle is not a part of the microsporangium; it is associated with the ovule and plays a role in the fertilization process.