Human Reproduction Test

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Human Reproduction Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

The rule of embryonic development was given by

A
von Baer

B
Haeckel

C
Wallace

D
Morgan

Solution

The blastula stage of embryonic development and the notochord was discovered by Karl Ernst von Baer Hutton. The theory of the development of germ layers (ectoderm, mesoderm, and endoderm) was described by Von Beer along with other scientists.
So, the correct answer is option A.
Question 2
1 / -0

Germ cells in mammalian gonads are produced by

A
Only mitosis

B
Only meiosis

C
Mitosis and meiosis both

D
Without cell division

Solution

In the development of large mammalian species germ cells are responsible for production of the sex gametes and thus the next generation of that species. Spermatogenesis and oogenesis both are occured by the mitosis and the meiosis.
Thus, the correct answer is option C.
Question 3
1 / -0

The cleavage is such method of divisions of fertilized egg in which the egg

A
Does not divide but only increase in size

B
Divides repeatedly but without growth

C
Divides repeatedly and grows

D
None of the above

Solution

Cleavage is the division of cells during embryonic development, in which the zygotes undergo rapid cell cycles without growth and produces a cluster of cells with same size as that of the original zygote.
Thus, the correct answer is option B.
Question 4
1 / -0

Which layer develops first during embryonic development?

A
Ectoderm

B
Mesoderm

C
Endoderm

D
Both B and C

Solution

Once after fertilization, zygote is formed, which then changes to blastocyst having an inner cell mass. This inner cell mass initially has two layers as epiblast and hypoblast. After two weeks, primitive streak appears. The epiblast moves towards the primitive streak and forms a new layer, called as the endoderm as the first layer. This epiblast keeps moving and forms a second layer and third layer as mesoderm and ectoderm respectively.
Thus, the correct answer is option C.
Question 5
1 / -0

Type of cleavage found in mammals is

A
Holoblastic

B
Meroblastic

C
Superficial

D
None of the above

Solution

Holoblastic cleavage is that in which the cleavage furrow divides the egg completely and the blastomeres formed may be equal or unequal in size. It occurs in alecithal or microlecithal eggs. Generally, the mammalian egg is alecithal, meaning no yolk.
Thus, the correct answer is option A.
Question 6
1 / -0

The only human system that is derived from all the three germ layers is

A
Digestive system

B
Excretory system

C
Respiratory system

D
Nervous system
Solution
The digestive system is derived from three germinal layers: mesoderm, endoderm, ectoderm.
Mesoderm gives rise to the connective tissue, including the wall of the gut tube and the smooth muscle.
Endoderm is the source of the epithelial lining of the gastrointestinal tract, liver, gallbladder, pancreas.
The ectoderm is the source of the epidermis, the lens of eyes, nails, hair, brain, spinal cord, neurons of the GI tract.
The excretory system is derived from the mesoderm.
The respiratory system is derived from the endoderm.
The nervous system is derived from the ectoderm.
Thus, the correct answer is option A.
Question 7
1 / -0

Ovulation in the human female normally takes place

A
At the beginning of the proliferative phase

B
At the end of the proliferative phase

C
At the mid secretory phase

D
Just before the end of the secretory phase

Solution

The proliferative phase is the second phase of the uterine cycle. Here, estrogen causes the lining of the uterus to grow or proliferate. As the ovarian follicles get mature, they secrete estradiol and estrogen. This estrogen initiates the formation of a new layer of endometrium in the uterus. Near the end of this phase, i.e., the 14$$^{th}$$ day, ovulation takes place.
Thus, the correct answer is option B.
Question 8
1 / -0

Pattern of cleavage in frog's egg is

A
Holoblastic

B
Holoblastic and unequal

C
Holoblastic and equal

D
All of the above

Solution

In frog, fertilisation is external and takes place in water. Zygote undergoes cleavage and develops into morula and blastula. The cleavage is holoblastic and unequal. Holoblastic cleavage means there is total cleavage and it is alsocalled complete cleavage. It occurs in the eggs which do not have much yolk sac.
So, the correct answer is 'Holoblastic and unequal'.
Question 9
1 / -0

The development of eye in vertebrate embryology is studied under

A
Notogenesis

B
Neurogenesis

C
Mesogenesis

D
Organogenesis

Solution

Notogenesis is the development of notochord.
Neurogenesis is the process by which neurons are generated from neural stem cells.
Organogenesis is the process by which an amorphous mass of cells transform into a complete organ. Formation of eye (organ) falls under organogenesis.
Thus, the correct answer is option D.
Question 10
1 / -0

A change in the amount of yolk and its distribution in the egg will affect

A
Formation of zygote

B
Pattern of cleavage

C
Number of blastomeres produced

D
Fertilization

Solution

The pattern of cleavage is influenced by the amount of yolk in the egg. For example, in eggs with less yolk, cleavages are equal, and the resulting blastomeres are of similar size. If the yolk is localized, (as in frog cells), then the cleavages are unequal, i.e., the cells which are derived from the yolky region (the vegetal pole) are larger than those derived from the region without yolk (the animal pole)
So, the correct answer is 'Pattern of cleavage'

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Re-Attempt Weekly Quiz Competition

Human Reproduction Test - 32

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Human Reproduction Test - 32

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SHARING IS CARING

Question 1

von Baer

Haeckel

Wallace

Morgan

Solution

Question 2

Only mitosis

Only meiosis

Mitosis and meiosis both

Without cell division

Solution

Question 3

Does not divide but only increase in size

Divides repeatedly but without growth

Divides repeatedly and grows

None of the above

Solution

Question 4

Ectoderm

Mesoderm

Endoderm

Both B and C

Solution

Question 5

Holoblastic

Meroblastic

Superficial

None of the above

Solution

Question 6

Digestive system

Excretory system

Respiratory system

Nervous system

Solution

Question 7

At the beginning of the proliferative phase

At the end of the proliferative phase

At the mid secretory phase

Just before the end of the secretory phase

Solution

Question 8

Holoblastic

Holoblastic and unequal

Holoblastic and equal

All of the above

Solution

Question 9

Notogenesis

Neurogenesis

Mesogenesis

Organogenesis

Solution

Question 10

Formation of zygote

Pattern of cleavage

Number of blastomeres produced

Fertilization

Solution

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