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 butterfly and honey bee life cycle of a butterfly metamorphosis in frogs the life of a butterfly types of reproduction in animals oviparous and viviparous

A tadpole develops into an adult frog by the process of

  1. Fertilization

  2. Metamorphosis

  3. Embedding

  4. Budding
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Fertilisation is the fusion of male and female gametes and results in the formation of zygote.
B. Metamorphosis is the process by which an organism undergoes various physical changes and transforms from immature adult or larval form into a mature adult.
C. Embedding means to get stuck on something.
D. Budding is a type of asexual reproduction in which the parent cell produces one or more bud like protuberances which detach from parent cell and grow into a new individual.
Hence, a tadpole develops into an adult frog by the process of metamorphosis as it is transforming from an immature adult into an adult frog. So, the correct answer is 'Metamorphosis'.
Multiple choice biology butterfly and honey bee life cycle of a butterfly metamorphosis in frogs the life of a butterfly types of reproduction in animals oviparous and viviparous

The extra-embryonic membranes of the mammalian embryo are derived from 

  1. Formative cells

  2. Follicle cells

  3. Inner cell mass

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

Extraembryonic membranes are formed outside the embryo from the trophoblast only in amniotes (reptiles, birds and mammals) and perform specific functions.

Multiple choice biology butterfly and honey bee life cycle of a butterfly metamorphosis in frogs the life of a butterfly types of reproduction in animals oviparous and viviparous

During regeneration modification of an organ to other organ is known as 

  1. Morphogenesis

  2. Epimorphosis

  3. Morphallaxis

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

  • Morphogenesis is the process of the development of shape and structure of an organism when they get mature.
  • Epimorphosis is the development of the cells and tissues through the dedifferentiation of adult or pre-existing cells. Here the tissues and organs that are lost are replaced by the existing ones. The new organs are originated according to the shape and size required and are also dependent upon surrounding factors.
  • Morphallaxis is the formation of tissues and organ due to loss or transformation of an existing organ.
So, the correct option is 'Epimorphosis'

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Choose the correct answers from the alternatives given.
The principal embryonic membranes are

  1. Chorion and umbilicus

  2. Amnion and placenta

  3. Amnion and chorion

  4. Placenta and umbilicus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The placenta is an ephemeral organ found only in eutherian mammals during gestation. Placenta is the only organ composed of cells derived from two different organisms i.e. from the fetus and the mother. The fetal membranes are chorion and amnion. The membranes from the uterine wall are deciduas basalis. It is the portion of the deciduas which is directly adjacent to conception at the implantation site. Decidua is a mucous membrane lining the uterus during pregnancy and it cast off during childbirth. After the implantation of the embryo, the uterine endometrium is called decidua. Thus the principal embryonic membranes are Amnion and chorion.
So the correct option is ' Amnion and chorion '.
Multiple choice botany root - external morphology morphology of the root root system in plants root

A root hair is formed by

  1. Epidermal cell

  2. Endodermal cell

  3. Cortical cell

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Root hairs are tubular extensions of the epidermis that greatly increase the surface area of the root. They are found only in the region of maturation of the root. 
The function of root hairs is to collect water and mineral nutrients present in the soil and take this solution up through the roots to the rest of the plant.
Multiple choice zoology locomotion and reproduction flagella other cell components single membrane bound organelles

Basal body is associated with the development of

  1. Cilia and flagella

  2. Cell plate

  3. Phragmoplast

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

Basal bodies/ basal granules/ kinetosomes/ blepharoplasts are the micro-cylinders that lie below the plasmalemma at the base of flagella or cilia. Cilia and flagella are vibratile hair like narrow protoplasmic processes present on the free surface of the cell which are connected with motility. Each one is made up of four parts: basal body, rootlets, basal plate and shaft.

Multiple choice biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

Which one develops from endodermis?

  1. Nervous system, urinary bladder and eye

  2. Liver, connective tissue and heart

  3. Thymus , spinal cord and brain

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The endodermis is the boundary between the cortex and the stele. In many seedless vascular plants, the endodermis is a distinctly visible layer of cells immediately outside the vascular cylinder (stele) in roots and shoots.
  • Hence endodermis is present in plants but not in animals.
  • So, the correct answer is 'None of these'.
Multiple choice female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

$32$ celled stage of human embryo is?

  1. Smaller than fertilized egg

  2. Same size of fertilized egg

  3. Two times the size of fertilized egg

  4. Four times the size of fertilized egg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During early cleavage, the embryo undergoes cell division without increasing in total volume, so the 32-celled stage (morula) is roughly the same size or smaller than the original fertilized egg due to the zona pellucida constraint.

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Epiphysis is connected with

  1. Brow spot in embryo

  2. Hypophysis

  3. Optic lobes

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

The epiphysis or the pineal body is an endocrine gland that develops from the roof of the diencephalon. During the embryo development, it is connected with the brow spot in the embryo. The brow spot is the region between the two eyes. The cells are considered to be the modified neurological cells. It secretes a hormone called the melatonin that regulates the diurnal cycle of the body. Hence, the correct answer is 'Brow spot in embryo'

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

In ovule, exostome is

  1. Area just outside the micropyle

  2. Area at the tip of nucellus

  3. Part of micropyle enclosed by inner integument

  4. Part of micropyle enclosed by outer integument
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In an ovule, an opening is formed at the tip of ovule by the integuments called as micropyle. The micropyle acts as a pore for the entry of pollen tube into the ovule for fertilization. In bitegmic ovules, the opening is formed by the inner integument and is called endostome. If the opening is formed by the outer integument it is called exostome. Sometimes it is formed by both the integuments, then it is called as amphistome. 

Thus, the correct answer is option D.

Multiple choice biology reproduction in living organisms regeneration asexual modes of reproduction reproduction in animals

During regeneration, modification of an organ to another is known as

  1. Morphogenesis

  2. Epimorphosis

  3. Morphallaxis

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

A.Morphogenesis – Formation of organs from the embryo is called Morphogenesis or organogenesis.

B.Epimorphosis - Regeneration of limbs or tail is an epimorphosis regeneration. Replacement of lost organ of the body by proliferating new cells from the surface of the injured part is called Epimorphosis.

C. Morphallaxis - The reconstruction of an entire animal from a small fragment by reorganizing the existing cells, is called Morphallaxis.

D. Accretionary growth – It involves a cell secretion to increase the volume of the extracellular spaces. Many adult tissues will only divide when induced by injury or other stimuli. It occurs in cartilage and bone.

So, the correct option is ‘Morphallaxis’.

Multiple choice biology reproduction in living organisms regeneration asexual modes of reproduction reproduction in animals

Regeneration of liver is

  1. Epimorphosis

  2. Reparative regeneration

  3. Metamorphosis

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

A. Epimorphosis - Regeneration of limbs or tail is an epimorphosis regeneration. Replacement of lost organ of the body by proliferating new cells from the surface of the injured part is called Epimorphosis.

B. Reparative regeneration - Regeneration of damaged cells or tissues in the injured parts, in multicellular organisms is called reparative regeneration.

C. Metamorphosis - the process of transformation from an immature form to an adult form in two or more distinct stages.

D. Morphogenesis - the biological process that causes an organism to develop its shape.

So, the correct option is ‘Reparative regeneration’.