Question

A student claims, “In humans, ovulation always happens on day 14 of the menstrual cycle”. Critically examine this claim and state whether the claim is correct or not. Give at least two reasons for your answer.

Answer 1

The claim is incorrect. Ovulation usually occurs around day 14 in a typical 28-day cycle, but not always.

Reasons: 

1. menstrual cycles vary in length from about 21 to 35 days, so the day of ovulation changes; 
2. ovulation can be affected by hormonal fluctuations, stress, illness, age, and other factors, so it may occur earlier or later than day 14.