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प्रश्न
Name the function of the following:
Corpus luteum
State the main function of the corpus luteum.
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उत्तर
It secretes progesterone, a hormone that prepares the uterus for implantation. If implantation fails, the corpus luteum goes inactive and degenerates. If an embryo is implanted, the corpus luteum continues to release progesterone until the fourth month of pregnancy, when the placenta takes over this function.
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संबंधित प्रश्न
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
the Biological/technical term for Complete stoppage of menstrual cycle in females
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Give a significant point of difference between the oestrous and menstrual cycles.
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Sketch the labeled diagram:
Menstrual cycle
Define: Menarche
Explain the menstruation phases in the menstrual cycle of a human female.
State the names of four hormones which control menstrual cycle.
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television programme. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.
What is first menstruation called? When does it occur?
Which one of the following menstrual irregularities is correctly matched?
Answer the following type of question Assertion (A) and Reason (R).
(A) - Ovulation is the release of the ovum from the Graafian follicle.
(R) - It occurs during the follicular phase of the menstrual cycle.
Progesterone peaks during which phase of the menstrual cycle?
Calculate the expected date of ovulation, if in a normal menstruating woman, gets her menses on 5th April.
Luteal phase is also known as ____________.
The mammalian corpus luteum produces ______.
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.
Level of which hormones are at their highest during the luteal phase (second half of the cycle) of the menstrual cycle?
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
Subject 2 has a higher level of hormone B, which is ______
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
For subject 2 it is observed that the peak for hormone B has reached the plateau stage. After approximately how much time will the curve for hormone B descend?
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
Which of the following statements is true about the subjects?
In case the ova does not fertilize, which of the following events will take place?
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
Define ovulation.
When does the corpus luteum degenerate?
Menstrual flow occurs due to lack of ______.
The main function of mammalian corpus luteum is to produce ______.
After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form:
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
Describe hormonal control in various phases of the menstrual cycle.
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
Which of the following statement is correct?
Spermatogenesis is induced by ______.
The enlarged mature follicle bursts to release the egg.
In the human menstrual cycle, the ovulation occurs around ______.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Follicular phase: 5-12 days:: Luteal phase : ______ days.
