Q. No.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
During embryonic development:
| 1. | the trophoblast cells help in the formation of the placenta and inner cell mass differentiates into the embryo |
| 2. | the trophoblast cells differentiate into the embryo and inner cell mass helps in the formation of the placenta |
| 3. | the trophoblast cells help in the formation of the placenta and both trophoblast cells and inner cell mass differentiate into the embryo |
| 4. | the trophoblast cells help in the formation of the placenta and differentiate into the embryo as well |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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 |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The cleavage divisions in the human embryo may be best described as:
| 1. | Holoblastic, Equal, Indeterminate, Radial |
| 2. | Holoblastic, Unequal, Indeterminate, Radial |
| 3. | Holoblastic, Equal, Indeterminate, Spiral |
| 4. | Meroblastic, Equal, Indeterminate, Spiral |
Chorion in terrestrial vertebrate embryos:
| 1. | prevents desiccation of the embryo |
| 2. | helps in the exchange of oxygen and carbon dioxide with the environment |
| 3. | perform excretory functions |
| 4. | acts as a shock absorber |
Erythropoiesis in the earliest days of gestation is the function of:
| 1. | yolk sac | 2. | chorion |
| 3. | fetal bone marrow | 4. | amnion |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | All mammalian embryos will develop into females unless a functional SRY gene is present. |
| Reason (R): | SRY gene is non-functional in a female zygote. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Which one of the following statements with regard to embryonic development in humans is correct?
| 1. | Cleavage divisions bring about a considerable increase in the mass of protoplasm. |
| 2. | In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second. |
| 3. | With more cleavage divisions, the resultant blastomeres become larger and larger. |
| 4. | Cleavage division results in a hollow ball of cells called morula. |
The formation of the three embryonic germ layers is called:
| 1. | morulation | 2. | blastulation |
| 3. | neurulation | 4. | gastrulation |
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 |
© 2024 GoodEd Technologies Pvt. Ltd.