Q. No.In the given diagram showing a blastocyst in human embryonic development:
I:
Both 3 and 5 are parts of inner cell mass and contribute to the embryo
II:
4 becomes the future amniotic cavity and prevents desiccation of the embryo
III.
2 is the outer cell mass and contributes to the placenta and ectoderm of the embryo
1.
Only I is correct
2.
Only I and III are correct
3.
Only I and II are incorrect
4.
I, II, and III are incorrect
Before the placenta takes over, what structure secretes large amounts of progesterone to support pregnancy?
| 1. | Corpus Albicans | 2. | Graafian follicle |
| 3. | Chorion | 4. | Corpus luteum |
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The regeneration of the uterine endometrium through proliferation corresponds to:
| 1. | the ovarian follicular phase and is regulated by estrogen |
| 2. | the ovarian luteal phase and is regulated by progesterone |
| 3. | the ovarian follicular phase and is regulated by progesterone |
| 4. | the ovarian luteal phase and is regulated by estrogen |
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In menopausal women you expect to find:
| 1. | high circulating levels of ovarian steroids but low levels of gonadotropins |
| 2. | high circulating levels of ovarian steroids and high levels of gonadotropins |
| 3. | low circulating levels of ovarian steroids but high levels of gonadotropins |
| 4. | low circulating levels of ovarian steroids and low levels of gonadotropins |
The figure shows a secondary follicle in the ovary of a female. Identify the correct match:
| (1) | (2) | (3) | (4) | |
| 1. | Secondary oocyte | Zona pellucida | Granulosa cells | Theca cells |
| 2. | Secondary oocyte | Perivitelline space | Granulosa cells | Theca cells |
| 3. | Primary oocyte | Zona pellucida | Theca interna | Theca externa |
| 4. | Primary oocyte | Zona pellucida | Granulosa cells | Theca cells |
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In humans, the process of spermatogenesis in males and oogenesis in females are similar in:
1. Age at which the processes begin
2. The number of resultant haploid cells
3. Cytokinesis
4. Occurring in respective primary sex organs
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Identify the incorrect statement:
| 1. | Fetal ejection reflex is initiated by a fully developed fetus and placenta |
| 2. | Colostrum contains the IgA class of antibodies and is very important for newborn |
| 3. | For fertility, at least 60% of sperms in semen should show vigorous motility |
| 4. | The most common site of fertilization is the oviduct and that of implantation is endometrium |
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Identify the incorrectly matched pair:
|
1. |
Leydig cells |
Secrete androgens when stimulated by LH |
|
2. |
Sertoli cells |
Help in spermiogenesis and also secrete inhibin |
|
3. |
Seminal vesicles |
Contribute fructose to seminal plasma and store sperms |
|
4. |
Prostate |
Unpaired gland frequently gets enlarged in older men |
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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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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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