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 zoology applications of biotechnology cloning process of cloning gene cloning

The technique in which the developing embryo (at definite stage) from a pregnant superior breed is removed and transferred to another female with inferior characters, in whose body further development till birth takes place. Such technique is called as

  1. Embryo transfer

  2. Artificial insemination

  3. Protoplast fusion

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

  • Embryo transfer is the technique in which the developing embryo from a pregnant superior breed is removed and transferred to another female with inferior characters for establishing the pregnancy and in whose body further development takes place till birth. It is used in humans as well as animals.

So, the correct answer is 'Embryo transfer'.

Multiple choice zoology applications of biotechnology cloning process of cloning gene cloning

The nucleus of a donor embryonal cell/somatic cell is transferred to an enucleated egg cell. Then after the formation of an organism, what shall be true?

  1. Organism will have extranuclear genes of the donor cell

  2. Organism will have extra nuclear genes of recipient cell

  3. Organism will have extra nuclear genes of both donor and recipient cell

  4. Organism will have nuclear genes of recipient cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is given that the recipient cell has  been enucleated. It means its nucleus or genetic material has been removed. Hence, the organism that will develop from it would have the nuclear genes of donor embryonal/ somatic cell. Hence, the organism will have extra nuclear genes of recipient cell. 

Thus, the correct answer is 'Organism will have extra nuclear genes of recipient cell.'

Multiple choice zoology plant reproduction earthworm - reproductive system reproduction in earthworm introduction to reproduction

The term blastogenesis is used for

  1. Formation of blastula

  2. Formation of blastocoel

  3. Formation of blastomeres

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

Blastogenesis is the process of formation of offsprings asexually from reproductive bodies and does not include meiosis and fertilization. 

So, the correct answer is option D.

Multiple choice botany life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

Development of embryo from unfertilized egg is called as

  1. Parthenogenesis

  2. Apogamy

  3. Pseudogamy

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

Parthenogenesis is a type of asexual reproduction in which the embryo grows and develops from egg without fertilization. Apogamy is a type of reproduction in which sporophyte develops from a gametophyte without fertilization. Parthenocarpy is the phenomenon of development of fruit without fertilization. In this, fruits are seedless. Pseudogamy is a form of reproduction in which the embryo develops from egg following the stimulus of pollination but without fertilization. It involves activation of egg by sperm but does not involve nuclear fusion. 

Thus, the correct answer is option A.

Multiple choice zoology reproduction in organisms earthworm - reproductive system reproduction in earthworm introduction to reproduction

Development of an unfertilized egg is called

  1. Parthenogenesis

  2. Metamorphosis

  3. Gametogenesis

  4. Paedogenesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The process of development of an embryo from an unfertilized egg is known as parthenogenesis. It is a natural form of asexual reproduction. They are considered as the clone of the parent.
Paedogenesis is the process of reproduction by larval animals. Fertilization do not take place and the development take place due to metamorphosis.
Metamorphosis is the process of development of organism after birth or hatching. It mainly takes place in the presence of thyroid hormone.
Gametogenesis is the process by which gametes are formed.
So, the correct answer is option A.
Multiple choice biology the flower dicot seed structure of monocot and dicot seed the seed

Caruncle is derived from

  1. Peduncle

  2. Cotyledon

  3. Outer integument

  4. Inner integument
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In plants,Caruncle is an outgrowth near the hilum on the seeds of some plants of family Euphorbiaceae (like Hevea ). Outer integument is the outermost part of the ovule . During development of the ovule, the outer integument differentiates into different layers of seed coat. Caruncle is also derived from outer integument.
So, the correct option is 'Outer integument'
Multiple choice zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

The nervous system develop from which of the following primary germ layer?

  1. Endoderm

  2. Mesoderm

  3. Ectoderm

  4. Enteroderm

  5. Epidermis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Neural crest cells of ectoderm migrate downward to form the dorsal root ganglia of the spinal nerves and the postganglionic sympathetic neurons. The sensory cells in the dorsal root ganglia give rise to dendrites extending to sense organs and axons extending into the spinal cord. Some other neural crest cells form parts of certain sense organs and parts of the head. Few head derivatives of the neural crest give rise to sensory nerves and other parts of the peripheral nervous system and ganglia of the autonomic nervous system. Thus, the correct answer is option C.

Multiple choice zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

The central nervous system develops as a result of 

  1. Metamorphosis

  2. Gastrulation

  3. Neurulation

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

Metamorphosis is the process by which an organism changes its form or habits during normal development after embryonic stage.
Gastrulation is the process, where there are cell movements, which result in the reorganization of the embryo from blastula to gastrula.
Neurulation is the process of folding in the embryos of vertebrates, where there is the transformation of neural plate into the neural tube. This process induces the formation of the central nervous system.
Invagination is the infolding of one part within another part and it involves the morphogenetic processes by which an embryo takes form and is the initial step of gastrulation.
Thus, the correct answer is the option (C), 'Neurulation'.

Multiple choice zoology biotechnology and its applications stem cell stem cells and applications stem cells organ donation and body donation blood and organ donation

The stem cells required for embryonic stem cell culture is obtained from the

  1. Blastocyst.

  2. Liver.

  3. Umbilical cord.

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

The inner cells present in the blastocyst are the embryonic stem cells. When the embryonic culture is performed for obtaining the stem cells, the embryo is cultured till the blastocyst stage. The cells present as the inner cell mass are removed which act as a source of pluripotent stem cells which can differentiate into cells of the complete body.

Thus, the correct answer is option A. 

Multiple choice zoology biotechnology and its applications stem cell stem cells and applications stem cells organ donation and body donation blood and organ donation

Identify the wrong statement with respect to embryonic stem cells.

  1. They are pluripotent.

  2. They are isolated from epiblast tissue of blastocyst.

  3. They cannot proliferate in culture medium.

  4. They can give rise to the three germination layers.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Embryonic stem cells are derived from embryos. In human beings, they are derived from inner cell mass of 3 to 5 days old hollow microscopic ball of cells called blastocyst.

Blastocyst is isolated and transferred into a culture dish that contain a nutrient broth. In few days, cells of inner cell mass proliferate and begin spread over the surface of dish.
These proliferated stem cells are pleuripotent and referred to as embryonic stem line.
So, the correct answer is 'They cannot proliferate in culture medium'

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Prenatal growth in higher vertebrate is 

  1. Auxetic

  2. Accretionary

  3. Multipilicative

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

During pre-natal growth, there is an increase in the number of cells of the organism. So, this kind of growth is referred to as multiplicative or embryonic growth.
Hence, the correct answer is option (C), 'Multiplicative'.

Multiple choice zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

In humans the shape of fully formed placenta is

  1. Cuboidal

  2. Columnar

  3. Pyramidal

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

The human placenta is both metadiscoidal and monodiscoidal. Discoidal refers to the structure of the placenta and mono meaning there is only one disc. Metadiscoidal refers to the way the developing placenta becomes discoidal- the villi are scattered at first and then restricted to one disc, that means the placenta becomes mono-discoidal.

So, the correct answer is 'Discoidal'.