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SubjectsBiology
मासिक धर्म चक्र
This Class 12 Biology topic from Chapter 2: Human Reproduction explains the menstrual cycle as a coordinated series of changes in the ovaries and uterus. Students learn about the menstrual, follicular, ovulatory and luteal phases, and understand how hormones such as FSH, LH, oestrogen and progesterone regulate follicle development, ovulation and changes in the endometrium. The topic also connects the cycle with the possibility of fertilisation and the onset of menstruation when pregnancy does not occur.
TOPIC PRACTICE
Up to 3 questions from this page. Select your focus, then start.
Ovulation is the release of a mature secondary oocyte from an ovarian follicle, usually around the middle of a typical menstrual cycle. The oocyte can then enter the oviduct, where fertilisation may occur. Sperm production is spermatogenesis, attachment to the uterine lining is implantation, and milk production or secretion is lactation; therefore option A is correct.
The standard school-level average for the human menstrual cycle is about 28 days. The cycle is counted from the first day of menstrual bleeding to the first day of the next menstrual period, and it includes menstrual, follicular, ovulatory, and luteal events. Individual cycles may be shorter or longer, but 28 days is the accepted approximate average; therefore B is correct.
In the standard classification, day 1 of the menstrual cycle is the first day of menstrual bleeding, so the cycle begins with the menstrual phase. The follicular phase overlaps partly with this period and continues afterward, but ovulation occurs later after the mid-cycle hormonal surge. The luteal phase follows ovulation; thus the menstrual phase, option A, is the correct answer.
QUIZ COMPLETE
