NEET : Multiple Choice Questions : Human embryo development, Parturition Lactation

 

1. Which of the following statement is correct.
A. After implantation, finger-like projections  called chorionic villi  are developed on endometrium.

B. Chorionic villi are sorrounded by the maternal blood only.

C. The chorionic villi and uterine tissue both are  interdigitated with each other to form a unit called placenta.

D.Placenta is a structural and functional unit between chorionic vill and endometrium.
Answer : C Explanation

2. Finger-like projections  called chorionic villi  are developed on 

A. Endometrium
B. Trophoblast
C. Infundibulum
D. Inner cell mass 
Answer : B Explanation

3. Consider the following statement and select the number of correct statement.

1. Placenta serves as both endocrine and exocrine unit.
2. The placenta is connected to the embryo through an umbilical cord which helps in the transport of substances to and from the embryo.
3. During pregnancy,  the levels of other hormones like Cortisol, prolactin, thyroxine, etc are increased. 

4. Chorionic villi which are surrounded by the uterine tissue and maternal blood.

A. Two.             B. Four 

C. Three           D. One

Answer : D Explanation

4. Consider the following statement  with respect to exocrine function of placenta and select the number of correct statement.
1. Placenta facilitate the supply of oxygen and nutrients to the embryo.
2. Placenta remove  the carbon dioxide and excretory waste materials produced by the embryo. 
3. Placenta release human chorionic gonadotropin hormone.

4. Placenta release progesterone and estrogen to maintain the preganancy .

A. 1 and 2          B. 2 and 4 

C. 3 and 4          D. 1 and 3

Answer : A Explanation

5. Consider the following hormone which are released by the placenta as endocrine tissue and select the correct code
1. Human chrionic gonadotropin hormone (hCG)
2. Human Placental lactogen ( (hPL)
3. Progesterone
4. Estrogen
A. 1, 2 and 3
B. 2, 3 and 4
C. 1, 3 and 4
D. 1, 2, 3 and 4
Answer : D Explanation

6. Which of the following statement is correct.
A. Relaxin hCG & hPL hormone are produced in male and female both.

B.During pregnancy the levels of other hormones like  cortisol, prolactin, thyroxine, etc. are increased several folds in the foetal blood.

C. In the later phase of pregnancy, a hormone called relaxin is also secreted by the Placenta.

D. Placenta is a structural and functional unit between  foetal body and maternal body. 
Answer : D Explanation

7. Which of the following structure is differentiated into ectoderm , mesoderm and endoderm.
A. Blastocyst
B. Inner cell mass
C. Trophoblast
D. Endometrium
Answer : B Explanation

8. Which of the following germinal layer appear at last.
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Both mesoderm and ectoderm
Answer : B Explanation

9. Which of the following statement is not correct.

A. Inner cell mass is differentiates into ectoderm, mesoderm and endoderm.

B. Mesoderm appear soon between the ectoderm and endoderm.

C. Ectoderm , mesoderm and endoderm have potency to give rise to  all the tissue and organ in adult person.

D. Inner cell mass has special cell called stem cell which have the potency to give rise to all the tissues and organs. 

Answer : C Explanation

10. The  first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope after the
A. One week
B. One day
C. One month
D. One hour
Answer : C  Explanation

11. Match the list 

 (End of Month )     ( Body Str.)

A. 2nd Month.         1. Limbs &                                        digits. 

B. 12th  week          2. Genital                                         organ

C. 5th Month           3. Eye                                              lashes

D. 2nd Trimester    4. First                                           Movement

         A    B     C      D 

A.     1     2     3       4

B.     1     2     4       3

C.     1     3     4       2

D.     1    3      2       4 

Answer :  B Explanation

12. Which one of the following event does not occur in  developing foetus by the end of about 24 weeks or end of second trimester.

A. The body is covered with fine hair
B.  Eye-lids separate
C.  Eyelashes are formed. 
D. Placenta start to sent signal to brain for delivery of baby.
Answer :  D Explanation

13. The signal of parturition or child  birth is initiated by the 
A. Uterus
B. Foetus 
C. Placenta 
D. Placenta & Fully developed foetus
Answer : D Explanation

14. Foetal ejection reflex signifies
A. To release oxytocin from posterior pituitary causing contraction in uterus.
B. Recieving the signal of child birth from fully developed foetus and placenta.
C. Expel of baby through the birth canal
D. Release of milk from mammary gland during parturition.
Answer : A Explanation

15. Consider the following statement  and select the correct code.
1. Parturition is a neuroendocrine mechanism.
2. Oxytocin hormone is released from anterior pituitary to cause contraction in Uterus.
3. Due to vigrous contraction in endometrium , fully developed foetus is expelled from birth canal. 

4. At the end of Pregnancy, relaxin hormone is released from the ovary to loosen the public symphysis.

A. 1 and 2          B. 2 and 4 

C. 3 and 4          D. 1 and 4

Answer : D Explanation

16 . Which of the following statement is not correct.

A. The milk during initial day of lactation is called Colostrum.

B. Colostrum is rich in antibody IgE and yellow in color.

C. Doctor recommended Colostrum to bring healthy baby due to presence of antibody.

D.  At the end of pregnancy, the mammary gland produces milk called lactation period.

Answer : C Explanation