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 biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

The embryo is formed by the fusion of

  1. Male gametes

  2. Male and female gametes

  3. Female gametes

  4. Spores and gametes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The embryo is an unborn or unhatched offspring in the process of development. It results from sexual reproduction, where there is a fusion of male and female gametes.
Thus, the correct answer is the option (B), 'Male and female gametes'.

Multiple choice biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

What is formed immediately after fertilisation?

  1. Placenta

  2. Foetus

  3. Embryo

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

Zygote is the fertilized egg, that results from the union of a female gamete (egg or ovum) with a male gamete (sperm) by a process called fertilization.
Placenta is an organ that connects the developing fetus to the uterine wall.
Foetus is the state between the embryonic stage and birth.
The embryo is about five weeks old (or from 7th week of pregnancy).
Thus, the correct answer is option D.

Multiple choice biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

Which of the following lead to pregnancy and development of embryo.
(i) Fertilization of egg
(ii) Maturation of egg
(iii) Release of egg
(iv) Embedding of embryo in thickened uterine wall.
Which of the following options gives the correct order of sequence in which they occur?

  1. (i), (ii), (iii), (iv)

  2. (ii), (i), (iii), (iv)

  3. (i), (iv), (ii), (iii)

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

After ovulation only matured eggs can be fertilized in reproduction. After fertilization at blastocyst stage implantation occurs in uterine wall and development of embryo takes place. Thus, the correct answer is option D.

Multiple choice biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

After fertilisation, the resulting cell which gives rise to a new individual is the

  1. Embryo

  2. Ovum

  3. Foetus

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

After fertilization, male and female gametes fuse to form a zygote. The zygote undergoes changes to form an embryo having two cells. Then there are successive divisions in embryo and formation of morula and blastula occurs. The embryo gives rise to a new individual. The embryo undergoes organogenesis and forms a new individual.

So, the correct answer is option A.

Multiple choice biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

At the time of fertilization

  1. First maturation division is completed

  2. Embryo is formed

  3. Second maturation division is completed

  4. First polar body is formed.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the sperm cell penetrates into the ovum, second maturation division occurs.

So the correct option is 'Second maturation division is completed.'

Multiple choice biology for the continuity of generation fertilization in human being fertilization in humans human fertilization

In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is

  1. Ovum

  2. Embryo

  3. Blastocyst

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

After fertilization zygote is formed. Zygote start moving towards uterus and initial development takes place. Zygote enters the uterus on 3rd day in morula stage and later develops into blastocyst that implants in uterus wall. Thus, the correct answer is option C.

Multiple choice zoology embryonic development in human muscle tissue structure of protein muscle tissues

Muscles of iris and ciliary body originate from

  1. Ectodoerm

  2. Mesoderm

  3. Endoderm

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

Muscles of iris and ciliary body are "smooth muscles". Smooth muscle cells arise from undifferentiated mesenchymal cells (embryonic mesoderm). These cells differentiate first into mitotically active cells, myoblasts, which contain a few myofilaments. Myoblasts give rise to the cells which will differentiate into mature smooth muscle cells. Iris is derived from neuroectoderm but the muscles of iris is derived from mesoderm. Thus, the correct option is B.

Multiple choice biology biodiversity and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

Amniotic membranes are formed in
I. Amphibians
II. Birds
III. Mammals
IV. Reptiles

  1. I, II and IV

  2. II and III

  3. II, III and IV

  4. I and IV

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

Amniotic membrane is the innermost layer of the placenta consisting of a thick basement membrane and an avascular stromal matrix. This is a thin tough and transparent  pair of membranes that form a sac in which the fetus of tetrapods vertebrates such as reptiles, birds and mammals develop. Thus, the correct answer is option C.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

The pro-ubisch bodies are converted to ubisch bodies when they become 

coated by ..............

  1. Sporoderm

  2. Sporopollenin

  3. Cutin

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

Ubisch bodies have been largely observed in plants, after they were first recorded around the aggregates of mimosoid pollen by Rosanoff. The tapetum may be secretory (glandular) or amoeboid (periplasmodial). The cells of tapetum form pro-ubisch bodies which get surrounded by sporopollenin and now called ubisch bodies. They participate in the formation of pollen exine. 

Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

Caruncle develops from

  1. Outer integument

  2. Cotyledon

  3. Funiculus

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

A. Seed in many members of the Euphorbiaceae, such as castor, the soft outgrowth capping the hard seed is formed by proliferation of the cells at the tip of the outer integument called caruncle. It is rich in starch and sugars.

B. Cotyledons-  They  are thin, semi-transparent and oval in outline in castor. They have palmate venation. The middle costa or rib is more prominent and bears a few lateral veins.

C. Funiculus- It is a stalk like structure which attaches the ovule to the placenta.

D. Inner integument- It forms the tegman, inner covering of seed.

So, the correct answer is ‘Outer Integument’.

Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

Endothelium develops from

  1. Endostome

  2. Exostome

  3. Chalaza

  4. Inner layer of integument
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The outer and inner integument of the ovule are of dermal derivation. The endothelium develops from the inner layer of integument. It is also called as  integumentary tapetum. At maturity, it becomes about 14-cell layers thick. The middle layers give the shape of the ripe seed. 

Thus, the correct answer is option D.

Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

Which of the following is true for the origin of epidermis and hypodermis

  1. Epidermis from corpus and hypodermis from tunica

  2. Epidermis from tunica and hypodermis from corpus

  3. Both from tunica

  4. Both from corpus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the tunica - corpus theory epidermis is d reined from outer layer of tunica and the remaining tissues are derived from remaining layer of tunica and entire corpus.

Multiple choice zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

Development of animal embryo from an unfertilized egg is called

  1. Parthenocarpy

  2. Parthenogenesis

  3. Apospory

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

Parthenogenesis as per the definition is a process of asexual reproduction where the unfertilized egg develops into an embryo. It is very commonly seen in pants and lower vertebrates (wasps, rotifers and bees) but very uncommon in higher animals.

Parthenocarpy, apospory, apomixis are all various forms of asexual reproduction in plants. So, the correct option is 'Parthenogenesis'.

Multiple choice zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

Which type of stimulus is used to achieve parthenogenetic development?

  1. Chemical

  2. Change in pH

  3. Pricking with microneedle

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

The stimulus which are used to induce artificial parthenogenesis are chemicals like salts, weak acids, organic solvents, (chloroform) urea, sucrose, strychnine and physical stimuli like temperature, electric shock or mere shaking, a needle smeared with blood (egg of frog) and saline solution (egg of sea urchin).

Thus, the correct answer is option D.

Multiple choice zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

Match List I with List II and select the correct answer using the codes given the lists.

List-I(Meaning) List-II(Phenomenon)
a. Embryos arise directly from diploid saprophytic cells(nucleus or integuments) $1$. Parthenogenesis
b. An arcbesporium differentiates but the megaspore mother cell develops into an unreduced embryo sac $2$. Polyeznbryony
c. Many embryos arising in one ovule $3$. Adventives embryonic
d. The development of embryo from unfertilized egg $4$. Delusory
  1. A-$1$, B-$2$, C-$3$, D-$4$
  2. A-$3$, B-$4$, C-$2$, D-$1$
  3. A-$3$, B-$2$, C-$4$, D-$1$
  4. A-$3$, B-$1$, C-$4$, D-$2$
Reveal answer Fill a bubble to check yourself
A Correct answer