Read the given statements:

Statement I: Ovum is released (ovulation) during the middle of each menstrual cycle.
Statement II: There is a chance of fertilisation during 10 -17 days of the menstrual cycle. 

Both statements I and II are correct.

The correct answer is Option (3) – Both statements I and II are correct.

Statement I is correct. Ovulation, which is the release of a mature egg from the ovary, usually occurs approximately midway through a woman's menstrual cycle. For instance, in a typical 28-day menstrual cycle, ovulation commonly occurs around day 14. One ovum is released during the middle of each menstrual cycle . Therefore, days 10 to 17 generally encompass the time frame when ovulation is expected to occur.

Statement II is also correct. Days 10 to 17 of the menstrual cycle are generally considered the most fertile period for many women. This range corresponds approximately to the time around ovulation when the mature egg is released from the ovary and is available for fertilization. Sperm can survive for a few days in the female reproductive tract, so sexual intercourse during this period can result in fertilization if sperm is present when the egg is released.

Therefore , Both statements I and II are correct.