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

An example of epiboly is _________.

  1. sea urchin endoderm formation

  2. ambhibian mesoderm formation

  3. sea urchin mesoderm formation

  4. mammalian hypoblast formation

  5. sea urchin ectoderm formation
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Sea urchin ectoderm formed by Epiboly.

Multiple choice

Intrinsic muscles of the tongue are derived from

  1. cervical somites

  2. occipital somites

  3. pharyngeal arch mesoderm

  4. second branchial cleft
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Clear segmentation equivalent to the somites of the trunk is seen only in the paraxial mesoderm of the occipital region, which gives rise to the occipital part of the skull and the extrinsic musculature of the tongue.

Multiple choice

Plerome gives rise to

  1. epidermis

  2. stele

  3. cortex

  4. hypodermis

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plerome gives rise to stele and endodermis of a plant.

Multiple choice

Which of the following combinations best describes the characteristic of amphibians in early developmental process?

  1. Mesolecithal eggs, telolecithal eggs and unequal holoblastic cleavage

  2. Microlecithal eggs, telolecithal eggs and discoidal cleavage

  3. Macrolecithal eggs, centrolecithal eggs and unequal holoblastic cleavage

  4. Mesolecithal eggs, meiolecithal eggs and unequal holoblastic cleavage
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amphibian eggs are mesolecithal (moderate amount of yolk) and telolecithal (yolk concentrated at one pole). They undergo unequal holoblastic cleavage, where the entire egg divides but into unequal-sized cells due to yolk distribution. This contrasts with other egg types in the options.