Human Reproduction Test

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Human Reproduction Test - 41

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Question 1
1 / -0

Cleavage in mammals is

A
Holoblastic equal

B
Holoblastic unequal

C
Superficial

D
Discoidal

Solution

when the complete egg divides or cleaved is called as holoblastic. Mammalian zygote undergoes holoblastic equal cleavage and results in the complete division of the zygote and the formation of subsequent cells, the blastomeres. Hence, option A is the correct answer.
Question 2
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Which of the following undergoes spermiogenesis?

A
Spematids

B
Spermatogonia

C
Primary spermatocytes

D
Secondary spermatocytes

Solution

The last stage of spermatogenesis in which the maturation of spermatids into motile spermatozoa takes place is called spermiogenesis. Hence, the correct answer is option A.
Question 3
1 / -0

How many sperms are formed by one primary spermatocyte?

A
4

B
3

C
2

D
1

Solution

One primary spermatocyte (2n) undergoes meiosis I and produces two daughter cells, each of which is known as secondary spermatocyte.
A secondary spermatocyte (n) then undergoes meiosis II and produces two daughter cells, known as spermatids (n).
These spermatids undergo spermiogenesis to become sperm (n). Spermiogenesis is a process in which they grow a tail from the centrosome, a midpiece containing several mitochondria which helps in production of ATP, and head, which contains the acrosome and the nucleus containing the haploid set of chromosomes. Hence, 4 sperms are produced from 1 primary spermatocyte. Hence, option A is correct.
Question 4
1 / -0

In mesolecithal eggs, the cleavage is

A
Equal, holoblastic

B
Unequal, holoblastic

C
Meroblastic

D
Discoidal

Solution

Mesolecithal eggs are the eggs that have intermediate amount of yolk sac and is generally concentrated at one pole, called the vegetal pole.
Depending upon the amount of yolk sac, cleavage in eggs can be holoblastic which is complete cleavage or meroblastic which is partial cleavage.
Mesolecithal eggs have holoblastic cleavage which is unequal.
So, the correct answer is 'Unequal, holoblastic'.
Question 5
1 / -0

Division of human egg is

A
Equal holoblastic

B
Unequal holoblastic

C
Superficial meroblastic

D
Discodial meroblastic

Solution

Human eggs are yolk-free which is known as alecithal. The division of human eggs is equal holoblastic in which the “cleavage divides the zygote into two equal parts”. Cleavage occurs in the fallopian tube which is known as oviduct during “conduction of zygote towards uterus”.
It is holoblastic due to microlecithal condition of the egg which is “radial, indeterminate and equal”. Holoblastic is the division of the whole egg.
Question 6
1 / -0

In which of the following, meroblastic cleavage is found?

A
Dog

B
Owl

C
Monkey

D
Rhinoceros

Solution

In eggs with more yolk, cleavage cannot cut through the large mass of yolk, and so the egg does not completely divide with each cleavage. This is known as meroblastic cleavage.
In meroblastic cleavage, what ultimately happens is that a clump of dividing cells sits atop the undivided yolk. This type of cleavage is a characteristic of birds, reptiles, some fishes and amphibians. Owl being a bird will show this type of cleavage.
Question 7
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Outer coat of seminiferous tubules is composed of fibrous connective tissue called as

A
Tunica propria

B
Lamina propria

C
Plica semilunaris

D
Both A and B

Solution

The testes are the male reproductive organs which are divided into lobules containing highly coiled seminiferous tubules. These tubules cells are surrounded by Leydig cells in the stroma. The seminiferous epithelium is surrounded by lamina propria known as tunica propria. This structure forms the fibrous connective tissue.
Thus, the correct answer is option D.
Question 8
1 / -0

Sustentacular cells are found in

A
Testis of mammal

B
Ovary of mammal

C
Testis of Ascaris

D
Pancreas of frog
Solution
Correct option (A)
Explanation of the correct option (A):
A sustentacular cell is a type of cell that provides structural support. They are of two types.
One type of cell is found in the Sertoli cell, in the testicle of mammals.
It is present in the walls of the seminiferous tubules and supplies nutrients to sperm as the Sertoli cell is nurse cell and other types of cells are found in the olfactory epithelium.
Question 9
1 / -0

The functional unit of the testis of man is

A
Uriniferous tubules

B
Malpighian tubules

C
Seminiferous tubules

D
Acini or lobules

Solution

Each test is oval-shaped measuring 4.5 cm long, 2.5 cm wide in adult. It is enclosed in fibrous sac called as tunica albuginea. The sac extends into a testes to divide the testes into lobules. Next to tunica albuginea is tunica vaginals which is a continuation of membrane of abdomino-pelvic cavity.
Each test contain 800 lightly coiled seminiferous tubules (functional unit of testis), which produce thousands of sperm each second.
The walls of the semniferous tubes are lined with germinal tissue. The germinal tissue contains two types of cells - spermatogenetic cell producing or developing the sperm cell and the sustentacular cell which provide nourishment for the germinal sperm. Between the seminiferous tubules clusters of endocrine cells, called as interstitial endocrinocytes (Leydig cell) secrete male sex hormone (Androgens), where testosterone is the most important.
Question 10
1 / -0

Lutein cells are found in

A
Primary follicle

B
Corpus albicans

C
Corpus luteum

D
All of the above
Solution
Correct Option: C

Explanation for the correct option:
The corpus luteum is a temporary endocrine structure in female mammals that is involved in the production of relatively high levels of progesterone and moderate levels of estradiol and inhibin A.
A new corpus luteum develops with each menstrual cycle.
Its cells develop from the follicular cells surrounding the ovarian follicle.
The follicular theca cells produce small luteal cells (thecal-lutein cells) and follicular granulosa cells produce large luteal cells which together forms the corpus luteum.

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Human Reproduction Test - 41

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Human Reproduction Test - 41

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SHARING IS CARING

Question 1

Holoblastic equal

Holoblastic unequal

Superficial

Discoidal

Solution

Question 2

Spematids

Spermatogonia

Primary spermatocytes

Secondary spermatocytes

Solution

Question 3

4

3

2

1

Solution

Question 4

Equal, holoblastic

Unequal, holoblastic

Meroblastic

Discoidal

Solution

Question 5

Equal holoblastic

Unequal holoblastic

Superficial meroblastic

Discodial meroblastic

Solution

Question 6

Dog

Owl

Monkey

Rhinoceros

Solution

Question 7

Tunica propria

Lamina propria

Plica semilunaris

Both A and B

Solution

Question 8

Testis of mammal

Ovary of mammal

Testis of Ascaris

Pancreas of frog

Solution

Question 9

Uriniferous tubules

Malpighian tubules

Seminiferous tubules

Acini or lobules

Solution

Question 10

Primary follicle

Corpus albicans

Corpus luteum

All of the above

Solution

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