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

Cleavage in mammals is considered as

  1. meroblastic

  2. holoblastic

  3. diploblatic

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

Mammalian zygote undergoes total cleavage as yolk is less in amount and thus holoblastic .

Multiple choice

Chondrogenesis refers to

  1. development of muscles during organogenesis

  2. development of cartilage during organogenesis

  3. development of bones during organogenesis

  4. development of notochord during organogenesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Cartilage is formed from condensed mesenchyme tissue during organogenesis and this is called chondrogenesis.

Multiple choice

Embryonic stem cells are derived from

  1. inner cell mass of blastocyst

  2. blastocoel

  3. inner cell mass of gastrula

  4. cells of trophoblast
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Inner cell mass of blastocyst  or emryoblast lies as a mass of cells in blastocyst  and give rise to embryonic stem cells and this part is used in stem cell research.

Multiple choice

The primitive gut formed during gastrulation is called

  1. blastocoel

  2. vitelline duct

  3. archenteron

  4. amniotic sac
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Archenteron is formed during gastrulation and is a cavity formed by invagination of cells of vegetal pole of blastula and at the end of gastrulation develops into the digestive tube and thus is considered as the primitive gut.

Multiple choice

A placentation that consists of a single compartment without septa and ovules attached to a central column that arises directly from the floral apex is called

  1. marginal placentation

  2. apical placentation

  3. free central placentation

  4. parietal placentation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A placentation that consists of a single compartment without septa and ovules attached to a central column that arises directly from the floral apex is called free central placentation.

Multiple choice

Egg apparatus is found

  1. at chalazal end of the embryo sac

  2. in the centre of the embryo sac

  3. at the micropylar end of the embryo sac

  4. between the integuments
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Egg apparatus is present at the micropylar end.

Multiple choice

The cells constituting the egg apparatus are

  1. 1 egg cell + 1 synergid

  2. 1 egg cell + 2 synergid

  3. 2 egg cells + 1 synergid

  4. 3 synergids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Egg apparatus consist of a large central egg cell and two lateral small synergids.