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 zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

Choose the correct answers from the alternatives given.
Which of the germ layers is best associated with development Of the heart?

  1. Ectoderm

  2. Mesoderm

  3. Endoderm

  4. All of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ectoderm, which is made up of columnar cells, forms the epidermis of the skin, nervous system, cornea, lens, retina, salivary glands and the enamel of teeth. The mesoderm gives rise to the dermis of skin, gonads, heart, blood and lymph, kidney, reproductive ducts and most of the muscles. The last layer, the endoderm gives rise to the gastric and intestinal glands, liver, pancreas, lining of the middle ear.

So the correct option is 'Mesoderm'.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Choose the correct answers from the alternatives given.
The organ of nutrition used in fetal development in the most successful mammals is the:

  1. mammary gland

  2. pouch

  3. placenta

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

Maternal nutrition plays a vital role in the growth and development of the fetus. During prenatal development, the fetal circulatory system is integrated with the placenta via the umbilical cord so that the fetus receives both oxygen and nutrients from the placenta. The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.

So, the correct option is, 'Placenta'.

Multiple choice biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

Lens and retina of vertebrate eye develop from 

  1. Mesoderm

  2. Ectoderm

  3. Endoderm

  4. Partly from ectoderm and partly from endoderm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Neuroectoderm gives rise to the following compartments of the eye: retina, epithelial lining of ciliary body and iris, optic nerves. Surface ectoderm produces the following parts: lens, corneal epithelium, skin of eyelid.

Multiple choice evs identifying the plants absorption of water from the soil root system the root system

In case tunica, is multilayered which is likely to happen?

  1. All layers take part in formation of multilayered epidermis

  2. All the layers produce cortex

  3. Outer most layer forms hypodermis, middle layer cortex and inner layer endodermis

  4. Only the outermost layer forms the epidermis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the tunica is multilayered, the condition is called multistratose tunica. The layers of tunica can be designated as L1, L2, L3 and so forth. The L1 or the outermost layer of the tunica would give rise to the epidermis and the rest of the layers would form the cortex and the vascular tissues, as seen in Datura.

Hence, the correct answer is 'Only the outermost layer forms the epidermis'.

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

In Amphioxus notochord is present only in

  1. In embryo

  2. In adult

  3. Both A and B

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

Amphioxus are fish-like marine chordates. The notochord is a flexible rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo. In case of Amphioxus, it is retained in the adults.

So, the correct answer is option C.

Multiple choice bio-chemistry digestive system of human digestive system - organs process of digestion coordination in the process of digestion

The literal meaning of "gastrulation" is 

  1. Formation of primary germ layers

  2. Formation of a gut

  3. Morphogenetic movement

  4. Commencement of organogenesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

'Gastrulation' word is derived from Greek word 'gaster' meaning stomach and according to McEwen (1923), gastrulation refers to the formation of the primordial gastric gut or cavity called the archenteron.

Multiple choice biology digestive system of human digestive glands liver pancreas

Pancreas are derived from 

  1. Ectoderm

  2. Endoderm

  3. Mesoderm

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In organogenesis, cells of the three germ layers lead to the formation of specific structures. The ectoderm eventually forms the outer layer of the skin and gives rise to the nervous system and sense organs. Tissues that eventually line the digestive tract and organs like liver, pancreas and lungs are all of endodermal origin. Skeletal tissue, muscle, and the circulatory, excretory, and reproductive systems are derived from mesoderm.

Thus, the correct answer is option B.

Multiple choice

Which of these sequences best represents frog metamorphosis?

  1. Egg, tadpole, froglet, adult frog

  2. Egg, larva, pupa, adult

  3. Egg, nymph, adult

  4. Egg, baby, adult
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Frogs begin as eggs, hatch into aquatic tadpoles, develop into froglets with limbs, and finally mature into adult frogs. Option B describes insect metamorphosis, which includes a pupal stage.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Tigellum is

  1. Embryonic axis

  2. Embryonic root

  3. Embryonic shoot

  4. Embryonic leaf
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cotyledons are attached to the curved embryonal axis (Tigellum) at the cotyledonary node. The ,micropylar end of embryonal axis is rod- shaped and slightly bulged. It is called radicle (or embryonic root). The other side of embryonal axis lies in between the two cotyledons. It is called plumule( or the shoot tip).

So, the correct answer is 'Embryonic axis'.

Multiple choice

From the third month of the pregnancy human embryo is called as

  1. Zygote

  2. Foetus

  3. Endosperm

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

In human prenatal development, the organism is called an embryo from implantation until the end of the eighth week. From the ninth week (the start of the third month) until birth, it is referred to as a foetus.

Multiple choice

What is the name of human embryo after third month of pregnancy ?

  1. Zygote

  2. Foetus

  3. Uterus

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

In human prenatal development, the offspring is called an embryo from conception until the end of the eighth week. From the ninth week (start of the third month) until birth, it is referred to as a fetus (or foetus).

Multiple choice

Connective tissue arises from which type of embryonic tissue?

  1. endoderm

  2. ectoderm

  3. mesoderm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mesoderm is the middle embryonic germ layer that gives rise to connective tissues, bones, muscles, and the circulatory system. Ectoderm primarily forms the nervous system and skin epidermis, while endoderm forms the epithelial linings of the digestive and respiratory tracts.

Multiple choice

Pluripotent cells inside the blastocyst do NOT have the ability to

  1. develop into most cell types

  2. form tissues surrounding the embryo

  3. develop into embryonic stem cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pluripotent cells can differentiate into nearly all cell types of the body, but they cannot form the extraembryonic tissues that surround and support the embryo. Totipotent cells, on the other hand, have the ability to form both the embryo and these extraembryonic tissues.