Biology

Embryonic Development

572 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

Picture belongs to

  1. (a) Fertilized embryo sac showing zygote and PEN

  2. (b) stages in embryo development in a dicot

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice

The ovule is a small structure attaches to

  1. Placenta by means of funicle

  2. Body of ovule fuses with funicle in the region hilum

  3. Hilum represents the junction berween ovule and funicle

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ovule attaches to the placenta via the funicle (stalk). The hilum is the junction point where ovule and funicle connect, analogous to a seed's attachment point.

Multiple choice

What gene group directs forelimb development?

  1. Duff genes

  2. Hox genes

  3. Kidd genes

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

Hox genes are a group of related genes that control the body plan of an embryo along the head-tail axis, including the development of limbs.

Multiple choice

At what week is the embryo now referred to as a fetus?

  1. by the end of the 8th week

  2. by the end of the 10th week

  3. by the end of the 5th week

  4. by the end of the 7th week
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In human prenatal development, the embryonic stage lasts through the end of the eighth week following fertilization. Beginning at the ninth week, or the end of the eighth week, the developing organism is officially classified as a fetus.

Multiple choice

Ectoderm cells in the embryo will form...

  1. lungs, intestine, pancreas

  2. skin, nervous system, eyes , ears

  3. heart, bones muscles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ectoderm is the outermost germ layer and gives rise to the epidermis (skin), the nervous system, and sensory organs like the eyes and ears. Mesoderm forms muscles and bones, while endoderm forms internal organs like the lungs and intestines.

Multiple choice

Inner cell mass of the blastocyst forms which membranes

  1. embryo

  2. cord and placenta

  3. embryo and yolk sac

  4. cord and yolk sac
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The inner cell mass (embryoblast) of the blastocyst is responsible for forming the embryo itself and associated structures like the yolk sac and amnion, while the outer trophoblast forms the placenta.

Multiple choice

Study and comparison of developing fetus

  1. homologous

  2. vestigial

  3. embryology

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

Embryology is the branch of biology that studies the development of embryos and fetuses. Comparing these developmental stages across species provides evidence for common ancestry.

Multiple choice

The food storage tissue that supports development of the embryo

  1. radicle

  2. hypocotyl

  3. endosperm

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

Endosperm is the nutritive tissue formed during double fertilization in angiosperms. It provides the necessary energy and nutrients to support the growth of the embryo until it can photosynthesize.

Multiple choice evs food trends types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Choose the correct answers from the alternatives given.
The archenteron develops into

  1. blastocoel

  2. endoderm

  3. lumen of the digestive tract

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

Archenteron is the primary cavity which is formed at the initial stage of gastrulation. This cavity begins at the dorsal lip of blastopore which is at the one side of the dividing zygote and then this cavity moves through the zygote to the other side which gives rise to the anus. 

So the correct option is 'lumen of digestive tract

Multiple choice

The telencephalon is derived from which embryonic structure?

  1. Prosencephalon

  2. Mesencephalon

  3. Rhombencephalon

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The telencephalon is derived from the prosencephalon, which is the most anterior part of the embryonic brain.