Sample Questions and Answers
- What is the main function of the bilaminar embryonic disc?
- A) To form the placenta
- B) To provide nutrients to the fetus
- C) To form the primary layers of the embryo
- D) To create the amniotic sac
- Answer: C
- Which two layers make up the bilaminar embryonic disc?
- A) Ectoderm and Mesoderm
- B) Epiblast and Hypoblast
- C) Endoderm and Mesoderm
- D) Ectoderm and Endoderm
- Answer: B
- During which week of development does the bilaminar disc form?
- A) Week 1
- B) Week 2
- C) Week 3
- D) Week 4
- Answer: B
- What is the main role of the hypoblast in the embryonic disc?
- A) To form the nervous system
- B) To contribute to the formation of the placenta
- C) To form the yolk sac and extraembryonic membranes
- D) To form the heart
- Answer: C
- What is the structure that surrounds the developing embryo, formed by the trophoblast?
- A) Amniotic sac
- B) Chorionic sac
- C) Yolk sac
- D) Allantois
- Answer: B
- What is the main function of the chorionic sac?
- A) To secrete hormones for pregnancy maintenance
- B) To form the neural tube
- C) To support the development of the heart
- D) To transport oxygen and nutrients to the embryo
- Answer: A
- Which structure is derived from the epiblast layer?
- A) Amniotic cavity
- B) Yolk sac
- C) Primitive streak
- D) Heart tube
- Answer: C
- Which of the following is NOT part of the bilaminar embryonic disc?
- A) Amniotic membrane
- B) Epiblast
- C) Hypoblast
- D) Primitive streak
- Answer: A
- Which extraembryonic structure develops from the trophoblast and helps to establish early pregnancy?
- A) Chorionic villi
- B) Neural tube
- C) Somite
- D) Primitive node
- Answer: A
- The primary function of the amniotic sac is to:
- A) Provide nourishment to the embryo
- B) Protect the embryo from mechanical shocks
- C) Form the placenta
- D) Facilitate blood circulation
- Answer: B
- At which point does the bilaminar disc transition into the trilaminar disc?
- A) Week 2
- B) Week 3
- C) Week 4
- D) Week 5
- Answer: B
- What is the chorion composed of?
- A) Epiblast and hypoblast
- B) Trophoblast and mesoderm
- C) Ectoderm and mesoderm
- D) Mesoderm and endoderm
- Answer: B
- What is the role of the trophoblast in the formation of the chorionic sac?
- A) It secretes the hormones progesterone and estrogen
- B) It helps in the formation of the placenta
- C) It forms the embryonic nervous system
- D) It supports fetal lung development
- Answer: B
- Which part of the embryo is responsible for the formation of the amniotic cavity?
- A) Epiblast
- B) Hypoblast
- C) Primitive streak
- D) Trophoblast
- Answer: A
- The development of the bilaminar embryonic disc occurs during which phase of pregnancy?
- A) Implantation phase
- B) Organogenesis phase
- C) Pre-embryonic phase
- D) Fetal development phase
- Answer: C
- Which structure is responsible for the initial nourishment of the developing embryo?
- A) Yolk sac
- B) Amniotic sac
- C) Placenta
- D) Chorionic sac
- Answer: A
- What structure is formed when the epiblast layer forms the primitive streak?
- A) Mesoderm
- B) Neural tube
- C) Endoderm
- D) Ectoderm
- Answer: A
- The hypoblast layer contributes to the formation of which structure?
- A) Ectoderm
- B) Endoderm
- C) Mesoderm
- D) Allantois
- Answer: B
- At the end of week 2, what is the shape of the bilaminar embryonic disc?
- A) Circular
- B) Elongated
- C) Triangular
- D) Oval
- Answer: B
- Which hormone is secreted by the trophoblast cells to maintain pregnancy?
- A) Progesterone
- B) Estrogen
- C) hCG (human chorionic gonadotropin)
- D) Prolactin
- Answer: C
- What structure is formed as the trophoblast differentiates into two layers?
- A) Placenta
- B) Chorion
- C) Yolk sac
- D) Amniotic cavity
- Answer: B
- Which layer of the bilaminar disc gives rise to the ectoderm?
- A) Epiblast
- B) Hypoblast
- C) Mesoderm
- D) Endoderm
- Answer: A
- The chorion is essential for the formation of which organ during pregnancy?
- A) Placenta
- B) Liver
- C) Heart
- D) Lungs
- Answer: A
- What type of cells are primarily found in the epiblast layer?
- A) Stem cells
- B) Differentiated cells
- C) Mesodermal cells
- D) Totipotent cells
- Answer: D
- The hypoblast layer eventually contributes to the formation of which structure?
- A) Placenta
- B) Yolk sac
- C) Neural tube
- D) Amniotic sac
- Answer: B
- Which of the following structures develops first in the embryonic period?
- A) Neural tube
- B) Bilaminar disc
- C) Heart
- D) Kidneys
- Answer: B
- What is the primary purpose of the amniotic fluid during early development?
- A) To deliver nutrients to the embryo
- B) To protect the embryo from dehydration
- C) To cushion the embryo from external pressure
- D) To regulate the temperature of the embryo
- Answer: C
- During which developmental stage does the chorionic sac completely surround the embryo?
- A) Day 10 of pregnancy
- B) Week 2
- C) Week 4
- D) Week 6
- Answer: B
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