Human Reproduction · Question 63

Menstrual flow occurs due to lack of :

1. Progesterone
2. FSH
3. Oxytocin
4. Vasopressin

The foetal ejection reflex in humans triggers the release of

1. oxytocin from foetal pituitary
2. human chorionic gonadotropin (hCG) from placenta
3. oxytocin from maternal pituitary
4. human placental lactogen (hPL) from placenta

The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/ characteristic. [Figure]

1. A- Tertiary follicle - Forms Graafian follicle
2. B- Corpus luteum - Secretes progesterone
3. A- Primary oocyte - It is in the prophase I of the meiotic division
4. B- Corpus luteum - Secretes estrogen

The secretory phase in the human menstrual cycle is also called :

1. Follicular phase lasting for about 6 days
2. Luteal phase and lasts for about 13 days
3. Follicular phase and lasts for about 13 days
4. Luteal phase and lasts for about 6 days

Identify the human developmental stage shown below as well as the related right place of its occurrence in a normal pregnant woman, and select the right option for the two, together. [Figure]

1. Developmental stage Late morula, Site of occurrence Middle part of Fallopian tube
2. Developmental stage Blastula, Site of occurrence End part of Fallopian tube
3. Developmental stage 8-celled morula, Site of occurrence Starting point of Fallopian tube
4. Developmental stage Blastocyst, Site of occurrence Uterine wall

Which one of the following statements is false in respect of viability of mammalian sperm?

1. Viability of sperm is determined by its motility
2. Sperms must be concentrated in a thick suspension
3. Sperm is viable for only up to 24 hours
4. Survival of sperm depends on the pH of the medium and is more active in alkaline medium

Signals for parturition originate from :

1. Placenta only
2. Fully developed foetus only
3. Both placenta as well as fully developed foetus
4. Oxytocin released from maternal pituitary

In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was :

1. High levels of FSH and LH in uterus to stimulate endometrial thickening
2. High level of circulating HCG to stimulate estrogen and progesterone synthesis
3. High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
4. High level of circulating HCG to stimulate endometrial thickening

The Leydig's cells as found in the human body are the secretory source of

1. Glucagon
2. Androgens
3. Progesterone
4. Intestinal mucus

What happens during fertilization in humans after many sperms reach close to the ovum?

1. Only two sperms nearest the ovum penetrate zona pellucida
2. Secretions of acrosome help one sperm enter cytoplasm of ovum through zona pellucida
3. All sperms except the one nearest to the ovum lose their tails
4. Cells of corona radiata trap all the sperms except one.