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

Which tissue connects embryo to the uterus wall ?

  1. Vagina

  2. Placenta

  3. Oviduct

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

The placenta is the special tissue that connects the developing embryo to the uterine wall, facilitating nutrient, gas, and waste exchange between mother and fetus. The vagina is the birth canal, oviduct is the fallopian tube, and hymen is a membrane.

Multiple choice

Name the period of development of embryo.

  1. Ovulation

  2. Menstruation period

  3. Gestation period

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

The gestation period is the developmental time from fertilization to birth. Ovulation is egg release, menstruation is the monthly cycle, and lactation is milk production after birth.

Multiple choice

Where the embryo sac is found?

  1. Endosperm

  2. Ovule

  3. Embryo

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

The embryo sac is the female gametophyte containing the egg cell, located within the ovule. After pollination, fertilization occurs in the embryo sac. The endosperm nourishes the embryo. The seed contains the ovule. The embryo develops from the zygote.

Multiple choice

What is the correct sequence of development of child from ovum?

  1. Ovum, uterus, foetus, embryo, oviduct, childbirth

  2. Ovum, oviduct, uterus, foetus, embryo, childbirth

  3. Ovum, oviduct, uterus, embryo, foetus, childbirth

  4. Ovum, oviduct, foetus, uterus, embryo, childbirth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct sequence of development of an ovum into child.

Multiple choice

Which of the following is the protein governing the coordination of cell–cell adhesion and gene transcription in mammals?

  1. Alpha-catenin

  2. Beta-catenin

  3. Delta-2-catenin

  4. Gamma-catenin

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

It is a dual function protein, regulating the coordination of cell–cell adhesion and gene transcription. Mutations and overexpression of β-catenin are associated with many cancers, including hepatocellular carcinoma, colorectal carcinoma, lung cancer, malignant breast tumors, ovarian and endometrial cancer.