#luteal phase

ZOOLOGY

Which phase of the menstrual cycle is characterized by high progesterone levels and prepares the endometrium for potenti

During the luteal phase, the corpus luteum secretes high levels of progesterone to thicken the endometrium for implantation. 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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Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation

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.

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 of the following is responsible for maintaining the corpus luteum during early pregnancy?

hCG, secreted by the trophoblast, maintains the corpus luteum and ensures continued progesterone production during early pregnancy.

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

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Gonads - Testis and Ovary Hormones

Which hormone is secreted by the corpus luteum and helps in the maintenance of pregnancy?

Progesterone, secreted by the corpus luteum, helps maintain pregnancy by supporting the uterine lining.

Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones

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