Human Reproduction Test

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Human Reproduction Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called as LH-surge) normally occurs?

A
5$$^{th}$$ day

B
11$$^{th}$$ day

C
14$$^{th}$$ day

D
20$$^{th}$$ day

Solution

The hormone estradiol suppresses the secretion of luteinizing hormone (LH) during the follicular phase. When the egg has almost matured, the levels of estradiol becomes maximum and beyond the optimum level, this effect is reversed and estrogen stimulates the production of large amounts of LH. This process is known as LH-surge and it starts around day 13$$^{th}$$ of the average 28- day cycle and may last for 24 - 48 hours
So, the correct answer is '14$$^{th}$$'
Question 2
1 / -0

Cleavage was first observed by

A
Swammerdam

B
Spallanzani

C
F.R. Lillie

D
Leeuwenhoek

Solution

Jan Swammerdam was the Dutch naturalist and he first observed the cleavage of the egg in the 17$$^{th}$$ century and he saw the first furrow of the frog's egg in cleavage.
Spallanzani was the first one to disprove spontaneous generation.
F.R. Lillie identified the influence of potassium on cell differentiation.
Leeuwenhoek was the first to observe bacteria and protozoa.
Thus, the correct answer is option A.
Question 3
1 / -0

The Wolffian duct gives rise to

A
Scrotum

B
Labia majora

C
Both A and B

D
Epididymis

Solution

The Wolffian tube is also known as mesonephric duct, Leydig's duct and nephric duct which differentiates into urogenital structure (include epididymis). It is the embryonic structure that form male internal genitalia.
Thus, the correct answer is option D.
Question 4
1 / -0

During embryonic development the establishment of polarity along anterior / posterior, dorsal / ventral or medial / lateral axis is called

A
Anamorphosis

B
Organizer phenomena

C
Pattern formation

D
Axis formation

Solution

Anamorphosis a deformed image, which will appear in its original shape, when viewed in some other way.
Organizer phenomenon was given by Spemann. He performed an experiment, that led to the view that development occurs through a cascade of cell-cell interactions.
Pattern formation is the generation of complex organizations of cell fates.
Axis formation: The overall body plan of organisms can be defined by three major axis, that are patterned during embryonic development as the anteroposterior, dorsoventral and the left-right axes.
Thus, the correct answer is option D.
Question 5
1 / -0

The human embryo is about one inch in length after

A
2 weeks

B
4 weeks

C
6 weeks

D
8 weeks

Solution

5-7 days after fertilisation, the blastocyst attaches to the wall of the uterus. When it comes in contact with the endometrium (the lining of the uterus), then implantation occurs.
At 4-5 week, neurogenesis starts, the heart starts to beat. Here, the embryo is 1/4 inch long.
At week 6, the human embryo is 1/2 inch in length.
At week 8, the embryonic period is about to end and the fetal period starts. Here, the embryo is about 1 inch long and is the size of a bean.
Thus, the correct answer is option D.
Question 6
1 / -0

If the nuclei from an 8 celled stage of an embryo are transplanted into enucleated eggs, which of the following events is likely to occur?

A
Formation of viable embryo in the recipient eggs.

B
Donor nuclei die in the new environment.

C
Cleavage occurs but is arrested after some time.

D
Recipient egg dies.

Solution

The nucleus can be transplanted from an early stage embryo to the unfertilized egg, which has been enucleated. This process is called as nuclear transplantation. This induces the development of the host egg according to the instructions of the newly inserted nucleus, which results in the formation of an organism with the same genetic material as the donor cell.
Thus, the correct answer is option A.
Question 7
1 / -0

How many secondary spermatocytes will be required to form 400 spermatozoa?

A
100

B
200

C
40

D
400

Solution

From spermatogonium, primary spermatocyte is formed and by mitosis. Then from one primary spermatocyte, two secondary spermatocytes are formed by meiosis followed by the formation of spermatids and finally 4 spermatozoa. As each secondary spermatocyte results in the formation of two spermatozoa, 200 secondary spermatocytes will give rise to 400 spermatozoa.
Thus, the correct answer is option B.
Question 8
1 / -0

The concept that organiser is essential for embryonic development was given by

A
J. Axelrod

B
C. Landsteiner

C
H. Spemann

D
I.P. Pavlov

Solution

Hans Spemann described an area in the embryo and some portions of the embryo that organize or induce secondary embryonic primordia (regardless of location) when transplanted into a second embryo. These areas are called as the "organizer centres" or just "organisers". Different parts of the organizer centre produce different parts of the embryo.
Hans Spemann was awarded 'Nobel prize in Physiology or Medicine' in 1935 for the discovery of embryonic induction phenomenon.
Thus, the correct answer is option C.

Question 9

1 / -0

List 1 contains terms and List 2 contains definitions. Match them correctly and choose the right answer.

	List I		List II
A	Parturition	1	Attachment of zygote to endometrium
B	Gestation	2	Release of egg from Graafian follicle
C	Ovulation	3	Delivery of baby from uterus
D	Implantation	4	Duration between pregnancy and birth
E	Conception	5	Formation of zygote by fusion of the egg and sperm
		6	Stoppage of ovulation and menstruation

A- 3, B- 4, C- 2, D- 1, E- 5

A- 4, B- 3, C- 2, D- 1, E- 5

A- 3, B- 4, C- 2, D- 5, E- 1

A- 3, B- 4, C- 1, D- 2, E- 5

Solution

At around 14th day of the menstrual cycle in human females egg is released from mature Graafian follicle under the influence of luteinizing hormone. This event is called as ovulation.

The fertilisation of an egg by sperm to give rise to a zygote is called as conception.

Fertilisation occurs in fallopian tubes, conception leads to pregnancy. Conception is followed by implantation i.e., attachment of fertilised egg or zygote to the wall of the uterus.

The time period between pregnancy and childbirth is called as gestation period. In humans, gestation period duration is roughly 38 weeks. During gestation period the embryo develops from a zygote. At the end of gestation period is parturition event during which child is delivered from the uterus.

Parturition is a complex process involving interplay of nervous and endocrine systems.

So, the correct answer is option A.

Question 10
1 / -0

Thickness of vitelline membrane in Drossophila is about

A
10$$\mathring A$$

B
30$$\mathring A$$

C
50$$\mathring A$$

D
60$$\mathring A$$

Solution

The vitelline membrane is the structure, which is directly adjacent to the outer surface of the plasma membrane of an ovum and is the innermost layer of eggshell. It is approximately 300 nm thick in Drosophila. Thus, the correct answer is option B.

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Human Reproduction Test - 84

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Human Reproduction Test - 84

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SHARING IS CARING

Question 1

5$$^{th}$$ day

11$$^{th}$$ day

14$$^{th}$$ day

20$$^{th}$$ day

Solution

Question 2

Swammerdam

Spallanzani

F.R. Lillie

Leeuwenhoek

Solution

Question 3

Scrotum

Labia majora

Both A and B

Epididymis

Solution

Question 4

Anamorphosis

Organizer phenomena

Pattern formation

Axis formation

Solution

Question 5

2 weeks

4 weeks

6 weeks

8 weeks

Solution

Question 6

Formation of viable embryo in the recipient eggs.

Donor nuclei die in the new environment.

Cleavage occurs but is arrested after some time.

Recipient egg dies.

Solution

Question 7

100

200

40

400

Solution

Question 8

J. Axelrod

C. Landsteiner

H. Spemann

I.P. Pavlov

Solution

Question 9

A- 3, B- 4, C- 2, D- 1, E- 5

A- 4, B- 3, C- 2, D- 1, E- 5

A- 3, B- 4, C- 2, D- 5, E- 1

A- 3, B- 4, C- 1, D- 2, E- 5

Solution

Question 10

10$$\mathring A$$

30$$\mathring A$$

50$$\mathring A$$

60$$\mathring A$$

Solution

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