Q. No.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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Identify the human development 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:
|
Developmental stage |
Site of occurrence |
|
|
1. |
Blastocyst |
Uterine wall |
|
2. |
8 cells morula |
Starting point of Fallopian tube |
|
3. |
Late morula |
Middle part of Fallopian tube |
|
4. |
Blastula |
End part of Fallopian tube |
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What is the correct sequence of sperm formation?
1. Spermatid, Spermatocyte, Spermatogonia, Spermatozoa
2. Spermatogonia, Spermatocyte, Spermatozoa, Spermatid
3. Spermatogonia, Spermatozoa, Spermatocyte, Spermatid
4. Spermatogonia, Spermatocyte, Spermatid, Spermatozoa
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Capacitation refers to change in the
1. Sperm before fertilisation
2. Ovum before fertilisation
3. Ovum after fertilisation
4. Sperm after fertilisation
Which of these is not an important component of initiation of parturition in humans?
1. Increase in oestrogen and progesterone ratio
2. Synthesis of prostaglandins
3. Release of oxytocin
4. Release of prolactin
Changes in GnRH pulse frequency in females is controlled by circulating levels of
1. Estrogen and progesterone
2. Estrogen and inhibin
3. Progesterone only
4. Progesterone and inhibin
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The amnion of mammalian embryo is derived from
1. Mesoderm and trophoblast
2. Endoderm and mesoderm
3. Ectoderm and mesoderm
4. Ectoderm and endoderm
Hormones secreted by the placenta to maintain pregnancy are
1. hCG,hPL, progestogens, estrogens
2. hCG, hPL, estrogen, relaxin, oxytocin
3. hCG, hPL, progestogens, prolactin
4. hCG, progestogens, estrogens, glucocorticoids
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