MCQs on Implantation and Gastrulation

Implantation is the act of firmly setting in. In particular, it is when the fertilized egg is attached to the lining of the uterus firmly, which usually takes place nearly 6 or 7 days after fertilization while gastrulation is the process wherein the embryo transforms from blastula to a gastrula with multiple cell layers during embryonic development.

1. ___________ is formed during gastrulation

(a) gill

(b) vitelline membrane

(c) heart

(d) archenteron

Answer: (d)

2. Mesoderm gives rise to all the structures except

(a) gonads

(b) circulatory system

(c) nervous system

(d) muscular system

Answer: (c)

3. The fertilized eggs in human females gets implanted in uterus

(a) after one month of fertilization

(b) after two months of fertilization

(c) after about 7 days of fertilization

(d) after 3 weeks of fertilization

Answer: (c)

4. Brain, nerve cells and spinal cord or the Central nervous system develops from embryonic

(a) mesoderm

(b) endoderm

(c) ectoderm

(d) both (b) and (c)

Answer: (c)

5. This list contains only the mesodermal structures

(a) Heart, blood, bones, notochord

(b) heart, blood, muscles, liver

(c) notochord, blood, liver, muscles

(d) liver, heart, bones, blood

Answer: (a)

6. Implantation is the process of

(a) attachment of blastocyst to the uterine wall

(b) egg movement

(c) degeneration of egg

(d) egg fertilization

Answer: (a)

7. This embryo has parasitic mode of nutrition

(a) mammalian embryo

(b) bird’s embryo

(c) amphibian embryo

(d) reptilian embryo

Answer: (a)

8. If the nuclei from an 8-celled stage of an embryo are transplanted into enucleated eggs, which of the following events is likely to take place

(a) recipient egg dies

(b) donor nuclei die in the new environment

(c) cleavage occurs but is arrested after some time

(d) formation of viable embryo in the recipient eggs

Answer: (d)

9. Egg implantation is followed by

(a) Parturition

(b) Copulation

(c) Fertilization

(d) Gestation

Answer: (d)

10. Pseudopregnancy is a physiological condition comparable to normal pregnancy except that there is no

(a) endometrial changes

(b) developing foetus

(c) corpus luteum

(d) developing ovum

Answer: (b)

Learn more MCQs on NEET at BYJU’S.

Related Links:

Leave a Comment

Your email address will not be published. Required fields are marked *