Q. No.
If the mammalian ovum fails to get fertilised, which one of the following is unlikely?
1.
Oestrogen secretion further decreases.
2.
Progesterone secretion rapidly declines.
3.
Corpus luteum will disintegrate.
4.
Primary follicle starts developing.
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In human adult females, oxytocin:
1. causes strong uterine contractions during parturition.
2. is secreted by the anterior pituitary.
3. stimulates the growth of mammary glands.
4. stimulates the pituitary to secrete vasopressin.
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Given below is a diagrammatic sketch for a portion of the human male reproductive system. Select the correct set of the names of the parts labelled a, b, c, d:
|
(a) |
(b) |
(c) |
(d) |
|
|
1. |
Ureter |
Seminal Vesicle |
Prostate |
Bulbourethral gland |
|
2. |
Ureter |
Prostate |
Seminal Vesicle |
Bulbourethral gland |
|
3. |
Vas deferens |
Seminal Vesicle |
Prostate |
Bulbourethral gland |
|
4. |
Vas deferens |
Seminal Vesicle |
Bulbourethral gland |
Prostate |
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Secretions from which one of the following are rich in fructose, calcium and some enzymes?
1. Liver
2. Pancreas
3. Salivary glands
4. Male accessory glands
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In human female, the blastocyst
1. Gets implanted into the uterus 3 days after ovulation.
2. Gets nutrition from uterine endometrial secretion only after implantation.
3. Gets implanted in endometrium by the trophoblast cells.
4. Forms placenta even before implantation.
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Signals from a fully developed foetus and placenta ultimately lead to parturition which requires the release of:
1. Oxytocin from the maternal pituitary
2. Oxytocin from foetal pituitary
3. Relaxin from the placenta
4. Estrogen from the placenta
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About which day in normal human menstrual cycle does rapid secretion of LH (popularly called LH surge) normally occurs?
1. 11th day
2. 14th day
3. 20th day
4. 5th day
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What happens during fertilisation in humans after many sperms reach close to the ovum?
| 1. | Only two sperms nearest the ovum penetrate zona pellucida. |
| 2. | Secretion of acrosome helps one sperm enter the cytoplasm of the 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. |
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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. | Sperms are 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. |
The secretory phase in the human menstrual cycle is also called?
1. Luteal phase and it lasts for about 13 days.
2. Follicular phase and it lasts for about 13 days.
3. Luteal phase and it lasts for about 6 days.
4. Follicular phase and it lasts for about 6 days.
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