Stages of Development of Human Embryo

Q.

The correct sequence of embryonic development is :

1. Gastrula - Morula - Zygote - Blastula - Embryo
2. Zygote - Morula - Blastula - Gastrula - Embryo
3. Zygote - Blastula - Morula - Gastrula - Embryo
4. Blastula - Morula - Zygote - Gastrula - Embryo

Q.

How many days after the period is frozen embryo transfer?

Q.

The embryo at the 16-celled stage is known as:

1. morula

2. gastrula

3. blastula

4. blastomere

Q.

Name and describe very briefly, the stages in the development of human embryo.

Q.

When does the process of cleavage in the fertilised egg of humans start?

1. Starts in uterus when the zygote attaches itself to the uterus wall
2. Starts at the blastocyst stage
3. Starts at the foetal stage
4. Starts when egg is in the fallopian tube

Q. Division of the single celled zygote by mitosis is called .

1. binary fission
2. multiple fission
3. cleavage
4. fragmentation

Q.

When does meiosis occur in Ferns?

Q.

Select the correct explanation for the labels A, B, C and D.

1. B represents the stage of morula formation.
   

2. D represents the blastocyst implantation.

3. C represents the blastocyst.
   

4. A represents the fertilised zygote.
   

Q.

Where do the following functions occur?
i. Production of an egg.
ii. Fertilisation
iii. Implantation of zygote

Q.

During multiple fission in Plasmodium, nucleus undergoes …………………………

1. Multiple cytokinesis

2. Multiple mitosis

3. Increase in size

4. Excessive growth

Q. Name and describe very briefly, the stages in the development of the human embryo. [5 MARKS]

Q.

Morula is a developmental stage___________

1. between the zygote and blastocyst

2. between the blastocyst and gastrula

3. between implantation and parturition

4. after the implantation

Q.

The thin-walled hollow structure in early embryonic development that contains a cluster of cells is called

1. Blastocyst

2. Ovum

3. Morula

4. Trophoblast

Q. Which of the following have the capacity to produce male child

1. both Egg and sperm
2. None of these
3. Egg

4. sperm

Q. Sort the fate of a fertilised egg in a female body.

1. Embryo
2. Foetus
3. Baby
4. Zygote
5. Implantation

Q.

At the time of implantation, the human embryo is called:

1. embryo

2. blastocyst

3. zygote

4. foetus

Q.

The stage at which implantation occurs is

1. Trophoblast

2. Blastocyst

3. Blastocoel

4. Blastopore

Q.

In which of the following marked regions does the formation of the following events take place: ​
A. Fertilisation​
B. Blastocyst implantation

Q.

Match the figures with the respective descriptions.

1. Daughter cells that are formed are known as blastomeres.
2. There is no growth phase between divisions during cleavage.
3. Mammalian blastula that contains two distinct cell lineages.
4. Inner cell mass becomes the embryo itself and trophoblast cells help implantation in the uterine wall.

1. i)➡ d , ii)➡ c, iii)➡ a, iv) ➡ b

2. i)➡ c, ii)➡ d, iii)➡ b, iv) ➡ a

3. i)➡ b, ii)➡ a, iii)➡ d, iv) ➡ c

4. i)➡ d, ii)➡ b, iii)➡ a, iv) ➡ c

Q.

What happens to the zygote after fertilisation?

1. Turns into single celled zygote

2. Turns into multicelled embryo

3. Turns into multicelled gamete

4. Turns into single celled follicle

Q.

Morula differs from the blastula in the

1. Absence of cavity

2. Absence of yolk

3. Presence of cavity

4. None of these

Q.

A zygote is completely divided into two by a cleavage furrow. This type of cleavage is________

1. equatorial

2. meroblastic

3. radial

4. holoblastic

Q.

The human embryo is referred to as a 'foetus' from the beginning of

1. 1st month of pregnancy

2. 2nd month of pregnancy

3. 3rd month of pregnancy

4. 4th month of pregnancy

Q. If an individual organism is going to create more individuals, a lot of its energy will be spent in the process.

1. True
2. False