With reference to the onset of menstruation, consider the following statements: 1. The first menstrual flow which begins at puberty is termed menarche. 2. Menstruation occurs once in about 10 to 15 days. 3. At 45 to 50 years of age, the menstrual cycle stops, which is termed menopause. Which of the statements given above are correct?

The correct option is (c). Explanation The reproductive cycle in the female primates (e.g., monkeys, apes, and human beings) is called the menstrual cycle. It involves cyclic changes in the ovary and the uterus induced by changes in the levels of pituitary and ovarian hormones. Statement-wise Analysis: - Statement 1 is Correct: The first menstrual flow begins at puberty and is technically termed menarche. This marks the onset of reproductive maturity in females. - Statement 2 is Incorrect: In human females, menstruation is repeated at an average interval of about 28 to 29 days. The cycle of events starting from one menstruation till the next one is called the menstrual cycle. A duration of 10 to 15 days is not the standard physiological norm. - Statement 3 is Correct: The menstrual cycle ceases around 45 to 50 years of age. This permanent cessation of menstruation is termed menopause. Cyclic menstruation is an indicator of normal reproductive phase and extends between menarche and menopause. Key Takeaway: Menarche is the onset of menstruation at puberty, while menopause is its cessation around the age of 50. The normal menstrual cycle repeats approximately every 28 to 29 days.

With reference to the onset of… - NCERT Class 8 Science MCQ

NCERT Class 8 Science — Chapter 4: Reaching the age of adolescence

mcqeasy

With reference to the onset of menstruation, consider the following statements:

The first menstrual flow which begins at puberty is termed menarche.
Menstruation occurs once in about 10 to 15 days.
At 45 to 50 years of age, the menstrual cycle stops, which is termed menopause.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 8 · Page 6

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

The reproductive cycle in the female primates (e.g., monkeys, apes, and human beings) is called the menstrual cycle. It involves cyclic changes in the ovary and the uterus induced by changes in the levels of pituitary and ovarian hormones.

Statement-wise Analysis:

Statement 1 is Correct: The first menstrual flow begins at puberty and is technically termed menarche. This marks the onset of reproductive maturity in females.
Statement 2 is Incorrect: In human females, menstruation is repeated at an average interval of about 28 to 29 days. The cycle of events starting from one menstruation till the next one is called the menstrual cycle. A duration of 10 to 15 days is not the standard physiological norm.
Statement 3 is Correct: The menstrual cycle ceases around 45 to 50 years of age. This permanent cessation of menstruation is termed menopause. Cyclic menstruation is an indicator of normal reproductive phase and extends between menarche and menopause.

Key Takeaway:

Menarche is the onset of menstruation at puberty, while menopause is its cessation around the age of 50. The normal menstrual cycle repeats approximately every 28 to 29 days.

Your note

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