Human Reproduction Test

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Human Reproduction Test - 92

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Weekly Quiz Competition

Question 1
1 / -0

During embryological development, one cell will influence another group and establish a pathway of events leading to gastrulation. This is influenced by a process known as

A
Embryonic induction

B
Transcription

C
Embryonic transduction

D
Blastulation
Solution
- Embryonic induction refers to the process in which one group of cells, the inducing tissue, directs the development of another group of cells, the responding tissue.
- This is an important process for formation of gastrula from blalstula i.e. gastrulation.
- So, the correct option is 'Embryonic induction'.
Question 2
1 / -0

Spermatids are formed after the second meiotic division from secondary spermatocytes. The ploidy of the secondary spermatocytes is

A
$$n$$

B
$$2n$$

C
$$3n$$

D
$$4n$$

Solution

Spermatogenesis is the process by which spermatozoa or sperm cells are produced from spermatogonial stem cells through mitosis and meiosis. The spermatogonium(2n) undergoes mitosis to form primary spermatocytes(n). The primary spermatocytes divide meiotically to form the secondary spermatocyte (n) which further divide to from the spermatids(n). These spermatids mature to form the sperms(n). The ploidy of secondary spermatocytes is n(haploid). Thus the correct answer is option A.
Question 3
1 / -0

Umbilical cord contain

A
Umbilicus

B
Placenta

C
Discus proligerus

D
Allantoic artery and vein

Solution

The umbilical cord normally contains two umbilical arteries which are called as an allantoic artery and one umbilical vein.
So the correct option is 'Allantoic artery and vein.'
Question 4
1 / -0

Indicate the correct sequence during spermatogenesis.

A
Spermatozoa $$\rightarrow$$ spermatogonia $$\rightarrow$$ spermatid $$\rightarrow$$ spermatocyte

B
Spermatogonia $$\rightarrow$$ spermatocyte $$\rightarrow$$ spermatid $$\rightarrow$$ spermatozoa

C
Spermatid $$\rightarrow$$ spermatocyte $$\rightarrow$$ spermatozoa $$\rightarrow$$ spermatogonia

D
Spermatocyte $$\rightarrow$$ spermatozoa $$\rightarrow$$ spermatid $$\rightarrow$$ spermatogonia

Solution

Spermatogenesis is the process by which mature haploid spermatozoa or sperm cells develop from germ cells. This process takes place in the seminiferous tubules of the testis. The process starts with the diploid spermatogonium. It undergoes mitosis to produce either primary spermatocyte or additional spermatogonia. Spermatogonia divide to give rise to primary spermatocytes. Each primary spermatocyte undergoes meiosis I to produce 2 haploid secondary spermatocytes. Secondary spermatocytes undergoes meiosis II to give rise to 2 spermatids each. Spermatids contain haploid number of chromosomes. Each spermatids then ultimately develop into mature haploid spermatozoa.
Question 5
1 / -0

Division of human egg is?

A
Equal holoblastic

B
Unequal holoblastic

C
Superficial meroblastic

D
Discoidal meroblastic

Solution

The cleavage in the human egg is equal holoblastic because the blastomeres are equally divided into 2 cells.
The cleavage is not unequal because the amount of yolk is less in the human egg as it is microlecithal, therefore there is no resistance in cleavage.
The unequal holoblastic cleavage can be seen in the frog egg because the yolk is concentrated on one pole only.
So, the correct option is ' Equal Holoblastic.'
Question 6
1 / -0

Cumulus oophorus represents

A
Heap of eggs

B
Heap of maturing follicles

C
Mass of cells in Graafian follicle

D
Mass of sperms embedded in Sertoli cells

Solution

It is a group of cell that arises from the granulosa cells and forms a solid layer surrounding the oocyte. These cluster of cell appear in the mature follicle.
They help in the maturation of the oocyte and protect the oocyte during ovulation. The innermost layer of the cells forms the Corona radiata.

So, the correct option is 'Mass of cells in Graafian follicle'
Question 7
1 / -0

Mosaic cleavage occurs in

A
Camel

B
Dog Fish

C
Whale

D
Echinococcus

Solution

Mosaic cleavage is also known as determinate cleavage. As the name suggests the cells of the blastocyst have a pre-decided fate which means any cell of the blastocyst cannot develop into an individual animal.
This type of cleavage is generally seen in the protostomes.
When the cells are dividing in the determinate cleavage they take up a mosaic shape that's why the name mosaic cleavage.
As the three options include the animals belonging to the deuterostomes we are left clear with the last option.
So, the correct option is 'Echinococcus.'
Question 8
1 / -0

Meiosis during sperm formation of Ascaris, was first observed by

A
Fleming

B
Boveri

C
Brauer

D
De Vries

E
Abbe

Solution

The formation of sperm from stem cells of testes is known as spermatogenesis. One sperm mother cell first undergoes mitosis and forms primary spermatocyte.
The primary spermatocytes then undergo meiosis 1 and form two secondary spermatocyte. The spermatid then undergoes meiosis II and thus form 2 spermatids each. This was first observed by Brauer in sperm formation of Ascaris.
So, the correct option is 'Brauer'
Question 9
1 / -0

In spermatogenesis, the phase of maturation involves

A
Growth of spermatogonia into spermatocytes

B
Formation of spermatogonia from gonocytes through mitosis

C
Formation of spermatids from primary spermatocytes through meiosis

D
Formation of oogonia from spermatocytes through meiosis

Solution

Spermatogenesis is the process of formation of the male gamete i.e sperms.
The sperm mother cell undergoes mitotic divisions in the phase of multiplication to form a large number of cells.
Some of the cells grow in size and forms the primary spermatocytes during the growth phase.
When the primary spermatocytes undergo maturation phase, they undergo meiosis to form 4 spermatids.

So, the correct option is ' Formation of spermatids from primary spermatocytes through meiosis'
Question 10
1 / -0

Meroblastic cleavage is

A
Total

B
Spiral

C
Incomplete

D
Horizontal

Solution

Meroblastic cleavage takes place in those eggs where the amount of yolk is high, which leads to the partial or incomplete cleavage. It is basically of two types spherical and discoidal. The discoidal type of cleavage takes place in the reptiles and birds whose eggs are telolecithal in nature. The cleavage furrow does penetrate the yolk. In superficial cleavage, the cytokinesis does not take place and it leads to a polynuclear egg. Superficial cleavage takes place in the arthropods. So, the correct option is 'Incomplete'

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Human Reproduction Test - 92

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Human Reproduction Test - 92

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SHARING IS CARING

Question 1

Embryonic induction

Transcription

Embryonic transduction

Blastulation

Solution

Question 2

$$n$$

$$2n$$

$$3n$$

$$4n$$

Solution

Question 3

Umbilicus

Placenta

Discus proligerus

Allantoic artery and vein

Solution

Question 4

Spermatozoa $$\rightarrow$$ spermatogonia $$\rightarrow$$ spermatid $$\rightarrow$$ spermatocyte

Spermatogonia $$\rightarrow$$ spermatocyte $$\rightarrow$$ spermatid $$\rightarrow$$ spermatozoa

Spermatid $$\rightarrow$$ spermatocyte $$\rightarrow$$ spermatozoa $$\rightarrow$$ spermatogonia

Spermatocyte $$\rightarrow$$ spermatozoa $$\rightarrow$$ spermatid $$\rightarrow$$ spermatogonia

Solution

Question 5

Equal holoblastic

Unequal holoblastic

Superficial meroblastic

Discoidal meroblastic

Solution

Question 6

Heap of eggs

Heap of maturing follicles

Mass of cells in Graafian follicle

Mass of sperms embedded in Sertoli cells

Solution

Question 7

Camel

Dog Fish

Whale

Echinococcus

Solution

Question 8

Fleming

Boveri

Brauer

De Vries

Abbe

Solution

Question 9

Growth of spermatogonia into spermatocytes

Formation of spermatogonia from gonocytes through mitosis

Formation of spermatids from primary spermatocytes through meiosis

Formation of oogonia from spermatocytes through meiosis

Solution

Question 10

Total

Spiral

Incomplete

Horizontal

Solution

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