Q. No.Identify the correct chronological order in which the following structures are formed:
a. blastocyst
b. morula
c. zygote
1.
a,b,c
2.
a,c,b
3.
b,c,a
4.
c,b,a
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Which part of the blastocyst develops into the embryo proper?
1. inner cell mass.
2. trophoblast.
3. blastocele.
4. yolk sac.
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Milk secretion by mammary glands is under the control of:
| 1. | oxytocin | 2. | prolactin |
| 3. | estrogen | 4. | progesterone |
Consider the following statements:
| I: | The uterine endometrium undergoes cyclical changes during the menstrual cycle. |
| II: | Estrogen secreted during the pre-ovulatory phase of the menstrual cycle helps in the development of follicle. |
| III: | hCG secreted by trophoblast cells helps in maintaining corpus luteum. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Consider the following statements:
| I: | The primary follicles present at birth carry primary oocytes arrested at meiosis I. |
| II: | The secondary oocyte arrested at meiosis II is released at ovulation. |
| III: | The second meiotic division is completed by the secondary oocyte just prior to the entry of the sperm into it. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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The epithelial covering of the highly vascular embryonic placental villi, which invades the wall of the uterus to establish nutrient circulation between the embryo and the mother are:
| 1. | chorionic villi cells | 2. | cytotrophoblast cells |
| 3. | inner cell mass | 4. | syncytiotrophoblast cells |
The fluid-filled cavities near the embryonic ectoderm and the embryonic endoderm are respectively:
1. amniotic cavity, blastocele
2. amniotic cavity, yolk sac
3. blastocele, amniotic cavity
4. yolk sac, amniotic cavity
The epidermis and the dermis of the skin develops respectively from embryonic:
1. ectoderm, endoderm
2. ectoderm, mesoderm
3. endoderm, mesoderm
4. endoderm, ectoderm
Identify the organ system in humans that is derived from all the three embryonic germ layers:
1. cardiovascular system.
2. digestive system.
3. endocrine system.
4. muscular system.
Parturition involves a positive feedback between:
1. uterine contraction, estrogen
2. estrogen, progesterone
3. estrogen, oxytocin
4. uterine contraction, oxytocin
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