#menstruation

ZOOLOGY

Which process is responsible for the degradation of maternal hormones, leading to menstruation if no fertilization occur

If fertilization does not occur, the withdrawal of progesterone and estrogen leads to the degeneration of the endometrium and the onset of menstruation.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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ZOOLOGY

Which of the following statements about rvical mucus during the menstrual cycle is correct?

During the peri-ovulatory phase, rvical mucus becomes thin and alkaline to help sperm move easily towards the ovum. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Reproduction and Reproductive Health, Topic: Gametogenesis, menstrual cycle and reproductive strategies.

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ZOOLOGY

Which phase of the menstrual cycle is marked by the regrowth of the endometrium after menstruation?

The proliferative phase, part of the follicular phase, is when estrogen promotes the regrowth of the endometrium following menstruation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Reproduction and Reproductive Health, Topic: Gametogenesis, menstrual cycle and reproductive strategies.

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ZOOLOGY

Which of the following events marks the initiation of the luteal phase in the menstrual cycle?

Ovulation triggers the transition from the follicular phase to the luteal phase, during which the corpus luteum forms. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph

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Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation

Which process is responsible for the shedding of the endometrial lining during menstruation?

The withdrawal of estrogen and progesterone levels, when fertilization does not occur, leads to the shedding of the endometrium (menstruation).

Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation

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Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation

Which phase of the menstrual cycle is marked by the regrowth of the endometrium after menstruation?

The proliferative phase, part of the follicular phase, is when estrogen promotes the regrowth of the endometrium following menstruation.

Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation

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Female Reproductive System and Gametogenesis

Which part of the uterus is shed during menstruation?

The endometrium, or the inner lining of the uterus, is shed during menstruation if no implantation occurs.

Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Female Reproductive System and Gametogenesis

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