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Questions
Describe the structure of a Graafian follicle.
Explain the structure of a Graafian follicle.
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Solution
- The Graafian follicle is a mature ovarian follicle.
- The secondary oocyte is positioned off to the side and is surrounded by a layer called zona pellucida, which is not made of cells and is produced by the oocyte’s vitelline membrane.
- There are three layers covering the Graafian follicle. They are as follows:
- Theca externa is the name for the outermost protective and fibrous covering.
- Inner to it is cellular theca interna which produces the hormone estrogen.
- Inner to the theca interna are the follicular cells from the membrane granulosa.
- From the membrane granulosa, the cells differentiate into discus proligerus and the corona radiata cells.
- Cumulus oophorus is the term used for the oocyte and surrounding granulosa cells.
- A fluid-filled cavity called the antrum lies between the oocyte and the membrane granulosa.
- It is filled with a fluid called liquor folliculi.
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Name the function of the following:
Corpus luteum
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
Withdrawal of which of the following hormones is the immediate cause of menstruation?
The endometrium in the female is the lining of ______.
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?
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.
Which of the following events is not associated with ovulation in human females?
What are the events taking place in the ovary and uterus during follicular phase of the menstrual cycle.
The graph given below shows the number of primordial follicles per ovary in women at different ages. Study the graph and answer the questions that follow.
- What is the average age of the women at the onset of menopause?
- At what age are maximum primordial follicles present in the ovary, according to the given graph?
Complete the table:
| Number | Type | No. of pairs | Region |
| C1C8 | Cervical | ______ | Neck |
| T1T12 | ______ | 12 pairs | ______ |
| L1L5 | Lumbar | ______ | Lower back |
| S1S5 | ______ | 5 pairs | ______ |
| CO1 | Coccygeal | ______ | ______ |
