Placentation is invariably associated with the viviparity of organism. It is the only organ in the animals formed by the temporary connection of the tissue-derived from two individuals mother and foetus. Part of the placenta-derived from the foetus is the foetal placenta while derived from the mother is the maternal placenta. In mammals, the placenta is fully formed in about 10 weeks and lasts throughout pregnancy. Biogenetic law states that ontogeny repeat phylogeny. Ontogeny is the life history of an individual animal phylogeny is the evolutionary history of the race of animals. It means that organisms ancestral history during development. Take Placentation And Biogenetic Law quiz and know more about placentation and biogenetic law.
1. The human placenta is derived from....
A. Endoderm
B. Mesoderm
C. Ectoderm
D. Trophoblast
2. What kind of placenta found in a man?
A. Haemochorial
B. Syndesmochorial
C. Epitheliochorial
D. Haemoendothelial
3. From where Villi of human Placenta arise?
A. Chorion
B. Allantois
C. Amnion
D. Yolk sac
4. Which one of the following hormone HCG?
A. Anterior pituitary
B. Pineal body
C. Posterior pituitary
D. Placenta
5. In mammals, the fetus is nourished through.....
A. Blood
B. Placenta
C. Both of these
D. None of these
6. Which organisms embryo has a parasitic mode of nutrition?
A. Fish
B. Amphibian
C. Mammals
D. Reptilian
7. Which one of the following hormones not secreted by the placenta?
A. Relaxin
B. Progesterone`
C. HCG
D. Testosterone
8. Who put forward recapitulation theory?
A. Von Baer
B. Corren
C. Haeckal
D. Darwin
9. If the villi in the Placenta form a type of girdle around blastocyst, it is named as......
A. Discoidal
B. Diffused
C. Cotyledonary
D. Zonary
10. In the placenta of a goat.....
A. All the six tissue barriers are intact
B. Uterine epithelium is eroded
C. Uterine epithelium and uterine connective tissues eroded
D. Endothelium of mother's blood is eroded
11. Blood flowing in the umbilical cord of the human fetus is.....
A. 100% fetal
B. 100% maternal
C. 50% fetal ,50% maternal
D. More fetal ,less maternal
Drop your comment here...
