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 |
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 |
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 |
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 |
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
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 |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): | A moist habitat is almost always required for external fertilization. |
Reason (R): | A moist habitat prevents the drying of gametes and allows sperms to swim to ova. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |