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
Which part of the blastocyst develops into the embryo proper?
1. inner cell mass.
2. trophoblast.
3. blastocele.
4. yolk sac.
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 |
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 |
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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