In human females at the time of birth there are two million ova: how many of them normally reach maturity in the course of normal reproductive life

Options

A. 500
B. 1000
C. 2000
D. 5000

Explanation

To solve the question of how many ova (eggs) in human females reach maturity during their reproductive life, we can follow these steps:

### Step 1: Understand the Initial Count of Ova
At the time of birth, human females have approximately 2 million ova (eggs).

### Step 2: Ova Count at Puberty
As the female matures, many of these ova undergo atresia (a process where the majority of the eggs degenerate). By the time a female reaches puberty, the number of viable ova decreases significantly to about 30,000 to 40,000.

### Step 3: Ova Maturation During Reproductive Life
During a female's reproductive life, typically only a small number of these ova will mature and be released during ovulation. On average, a female ovulates about once a month during her reproductive years, which usually lasts from puberty until menopause (approximately 30-40 years).

### Step 4: Calculate the Total Mature Ova
If we consider that a female ovulates approximately 12 times a year, and this continues for about 30 years (from around age 12 to 42), we can calculate the total number of ova that reach maturity:
- 12 ovulations/year × 30 years = 360 ova.

### Conclusion
Thus, out of the initial 2 million ova present at birth, typically around 360 ova reach maturity and are released during a woman's reproductive life.