Biology

Embryonic Development

621 Questions

Embryonic development questions cover the biological processes of gamete fusion, germ layer formation, and fetal maturation. The focus lies in identifying extraembryonic structures, trophoblast functions, and sequential developmental stages. This specialized topic appears regularly in biology screening tests and medical entrance examinations.

Germ layer formationBlastocyst implantationExtraembryonic structuresFetal development stagesReproductive physiology

Embryonic Development Questions

Multiple choice

When does an embryo become a fetus?

  1. After an egg is fertilized by a sperm cell during conception

  2. After fertilization when zygote attaches to the lining of the uterus wall

  3. After 15 days

  4. After delivery, embryo is called a fetus

  5. After 8 weeks of pregnancy
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Yes, it is correct, the embryo now resembles an adult and is known as fetus.

Multiple choice

How is blastula different from morula?

  1. Presence of more cells

  2. Presence of more yolk

  3. Presence of cavity

  4. Absence of cavity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blastula differs from morula in presence of cavity.

Multiple choice

What is trophoblast?

  1. Cells forming embryo properly

  2. Flattened blastomeres at the surface of embryo

  3. Central cavity inside the morula

  4. Division products of zygote
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Flattened blastomeres at the surface of embryo are called trophoblats.

Multiple choice

Which of the following statements is correct?

  1. Internal ear is derived from endoderm.

  2. Anterior lobe of pituitary is derived from ectoderm.

  3. Blood vascular system is derived from mesoderm.

  4. Tongue is derived from mesoderm.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blood vascular system is derived from mesoderm.

Multiple choice

Where does the development of embryo take place in humans?

  1. Seminal vesicles

  2. Uterus

  3. Oviduct

  4. Ovary
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

After fertilization, the embryo implants and develops in the uterus. The oviduct is where fertilization occurs, while the ovary produces eggs. Seminal vesicles are part of the male reproductive system.

Multiple choice

Which among the following statements does not characterise embryogenesis in human beings?

  1. Cells of the epiblast migrate along the outer edges of the reticulum.

  2. Human embryology is the study of this development during the first twelve weeks after fertilisation.

  3. The germinal stage takes around 10 days.

  4. The neural plate will form opposite the primitive streak in fetus.

  5. An embryonic disc is a bilaminar disc.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is nine months or 38 weeks.