Average reproductive life span of ovum is?
**Core Concept**
The reproductive life span of an ovum refers to the period from its maturation in the ovary to its potential for fertilization. This concept is crucial in understanding the physiology of human reproduction and the optimal timing for conception.
**Why the Correct Answer is Right**
The average reproductive life span of an ovum is approximately 12-24 hours, during which it remains viable for fertilization. After ovulation, the ovum is released from the ovarian follicle and enters the fallopian tube, where it can be fertilized by sperm. The ovum's viability decreases over time due to changes in its structure and function, making fertilization less likely as the hours pass.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the average reproductive life span of an ovum. While some sources may suggest a shorter or longer time frame, the generally accepted duration is 12-24 hours.
**Option B:** This option is incorrect because it is not a commonly cited estimate for the reproductive life span of an ovum. The correct time frame is more narrowly defined and is supported by scientific evidence.
**Option C:** This option is incorrect because it is not a realistic estimate for the reproductive life span of an ovum. The ovum's viability decreases significantly over time, making fertilization less likely as the hours pass.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the reproductive life span of an ovum is a critical factor in understanding the optimal timing for conception. Couples trying to conceive should be aware of the approximate time frame during which fertilization is most likely to occur.
**Correct Answer: C. 12-24 hours**