Intra-ovarian fertilization (IOF) means fertilization:

Options

A. Outside ovule
B. Outside embryo sac
C. By putting pollens directly into ovary wall
D. Between male gamete and synergids

Answer

C

Explanation

Intra-ovarian fertilization is used when the stigma create barrier for germination of pollens of other species. The pollens are then put directly into ovary wall giving a small cut and homonal stimulus.