Question 1

Which of the following best describes the major event of the embryonic period in human development?

Accepted Answer

Organs form from three primary germ layers

Question 2

During which week does the notochord first appear, and what is its primary significance?

Accepted Answer

Week 3; it defines the body axis and is the site of the future vertebral column

Question 3

Which structure is responsible for forming the embryo during the blastocyst stage?

Accepted Answer

Inner cell mass

Question 4

A patient is found to have a neural tube defect. Which nutrient deficiency during pregnancy is most likely responsible, and during which developmental process does this defect occur?

Accepted Answer

Folic acid deficiency; neurulation

Question 5

Which of the following is NOT a derivative of the ectoderm?

Accepted Answer

Kidneys

Question 6

The process by which the three primary germ layers are formed from the epiblast is called:

Accepted Answer

Gastrulation

Question 7

Which of the following best describes the role of the trophoblast during early development?

Accepted Answer

It helps form the placenta

Question 8

A researcher is studying the formation of somites. Which germ layer and process are directly involved in this event?

Accepted Answer

Mesoderm; segmentation of paraxial mesoderm

Question 9

Which of the following is a correct sequence of developmental stages during the first week after fertilization?

Accepted Answer

Zygote → Four-cell → Morula → Early blastocyst → Late blastocyst

Question 10

Which of the following adult structures is derived from the splanchnic mesoderm?

Accepted Answer

Heart

Question 11

If a mutation disrupts the formation of the intermediate mesoderm, which organ system is most likely to be affected?

Accepted Answer

Urinary system

Question 12

Which of the following best explains the function of induction during embryonic development?

Accepted Answer

It is the ability of one group of cells to influence the developmental direction of other cells

Question 13

A medical student is asked to identify the germ layer that gives rise to the lining of the digestive tube. Which layer should they choose?

Accepted Answer

Endoderm

Question 14

Which of the following statements about the fetal period is correct?

Accepted Answer

It is a time of maturation and rapid growth

Question 15

A newborn is diagnosed with a defect in the nucleus pulposus of the intervertebral discs. This structure is derived from which embryonic feature?

Accepted Answer

Notochord

Question 16

Which of the following best describes the function of the yolk sac in human embryonic development?

Accepted Answer

It gives rise to the earliest blood cells and blood vessels

Question 17

During which week does the embryo first appear recognizably human, and what is a notable feature at this stage?

Accepted Answer

Week 8; the head is disproportionately large

Question 18

Which of the following is a correct pairing of a germ layer and one of its adult derivatives?

Accepted Answer

Mesoderm – Bones

Question 19

A developmental biologist is studying the process of neurulation. Which of the following events is most directly associated with this process?

Accepted Answer

Formation of the neural tube from the ectoderm

Question 20

Which of the following best describes the role of somatic mesoderm during embryonic development?

Accepted Answer

It forms the dermis of the skin, bones, and ligaments

Basic Embryology: Stages of Human Prenatal Development

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