Q. No.Which one of the following is the most likely reason for the regular menstruation cycle not occurring in females?
1.
Fertilisation of the ovum
2.
Maintenance of the hypertrophical endometrial lining
3.
Maintenance of a high concentration of sex hormones in the bloodstream
4.
Retention of well-developed corpus luteum
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| Column I | Column II | |
| 1. | Ovulation | LH and FSH attain peak levels and sharp fall in the secretion of progesterone |
| 2. | Proliferative phase | Rapid regeneration of myometrium and maturation of Graafian follicle |
| 3. | Development of corpus luteum | Secretory phase and increased secretion of progesterone |
| 4. | Menstruation | Breakdown of myometrium and ovum not fertilized |
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Which one of the following statement is incorrect about menstruation?
| 1. | During normal menstruation, about 40 mL of blood is lost |
| 2. | The menstrual fluid can easily clot |
| 3. | At menopause in the female, there is, an especially, abrupt increase in gonadotropic hormones |
| 4. | The beginning of the cycle of menstruation is called menarche |
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Which part of the ovary in mammals acts as an endocrine gland after ovulation?
| 1. | Graafian follicle | 2. | Stroma |
| 3. | Germinal epithelium | 4. | Vitelline membrane |
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An oocyte is released from the ovary under the influence of LH :
| 1. | after completing meiosis and before the polar bodies are released |
| 2. | after completing meiosis I and before the release of the polar body |
| 3. | after completing meiosis |
| 4. | after completing meiosis I and after the release of the polar body |
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Both corpus luteum and macula lutea are :
1. found in human ovaries
2. a source of hormones
3. characterized by a yellow colour
4. contributory in maintaining pregnancy
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Which one of the following statements with regard to embryonic development in humans is correct?
| 1. | Cleavage divisions bring about a considerable increase in the mass of protoplasm. |
| 2. | In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second. |
| 3. | With more cleavage divisions, the resultant blastomeres become larger and larger. |
| 4. | Cleavage division results in a hollow ball of cells called morula. |
Women who consume the drug thalidomide for relief from vomiting during the early months of pregnancy give birth to children with :
| 1. | No spleen | 2. | Harelip |
| 3. | Extra fingers and toes | 4. | Underdeveloped limbs |
A cross-section at the midpoint of the middle piece of a human sperm will show :
| 1. | centriole, mitochondria, and 9+2 arrangement of microtubules |
| 2. | centriole and mitochondria |
| 3. | mitochondria and 9+2 arrangement of microtubules |
| 4. | 9+2 arrangement of microtubules only |
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
| 1. | Release of egg: 5th day |
| 2. | Endometrium regenerates: 5 - 10 days |
| 3. | Endometrium secretes nutrients for implantation: 11-18 days |
| 4. | Rise in progesterone level: 1 - 15 days |
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