Which one of the following is opposite part of micropylary end of ovule?

The correct option is Chalaza.

To understand why this is the correct answer, let us look at the structure of a typical angiosperm ovule:
1. Micropyle (Micropylary End): This is a small opening or pore at one end of the ovule where the integuments (protective layers) do not completely cover the nucellus. It serves as the entry point for the pollen tube during fertilization.
2. Chalaza (Chalazal End): Located directly opposite the micropylar end, the chalaza represents the basal part of the ovule where the integuments originate.
3. Funicle: This is the stalk-like structure that attaches the ovule to the placenta.
4. Hilum: This is the region where the body of the ovule fuses with the funicle.
5. Nucellus (referred to as Nucleus in some option translations): This is the central mass of parenchymatous tissue that contains the embryo sac.

Therefore, the basal part situated opposite the micropylary end is the chalaza.