Human Reproduction Test

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Human Reproduction Test - 66

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Question 1
1 / -0

Spermatogonia develop through division by

A
Amitosis

B
Mitosis

C
Meiosis I

D
Meiosis II

Solution

The germ cells lining the seminiferous tubules are known as the spermatogonia. The spermatogonia increase in number by mitosis. They are diploid in nature.
So, the correct option is 'Mitosis'.
Question 2
1 / -0

What is the number of sperms formed from four spermatocytes?

A
$$4$$

B
$$1$$

C
$$16$$

D
$$32$$

Solution

The primordial germ cells undergo mitotic division and increase in number. Some cells of the PMC grows in size and forms the primary spermatocytes. Primary spermatocyte undergoes its first meiotic division and forms two secondary spermatocytes with the polarity of n.
The secondary spermatocyte again undergoes meiosis II and forms four haploid spermatids. Thus from one primary spermatocyte, four spermatids are formed. These spermatids then mature and form the sperms.
So, the correct option is '16'
Question 3
1 / -0

Arrange the events in human female reproductive cycle.
a - Secretion of FSH
b - Growth of corpus luteum
c - Growth of follicle and oogenesis
d - Ovulation
e - Sudden increase in level of LH

A
a $$\rightarrow$$ c $$\rightarrow$$ e $$\rightarrow$$ d $$\rightarrow$$ b

B
c $$\rightarrow$$ a $$\rightarrow$$ d $$\rightarrow$$ b $$\rightarrow$$ e

C
a $$\rightarrow$$ d $$\rightarrow$$ c $$\rightarrow$$ e $$\rightarrow$$ b

D
b $$\rightarrow$$ a $$\rightarrow$$ c $$\rightarrow$$ d $$\rightarrow$$ e

Solution

Menstrual cycle starts with menstrual flow followed by follicular phase. During follicular phase levels of gonadotropins (LH and FSH) increase and estrogen levels also increase. This lead to rapid secretion of LH and LH surge is attained and hence ovulation takes place. After ovulation remains of Graafian follicle turns into Corpus luteum which secretes large amounts of progesterone.
So, the correct option is 'a →c →e →d →b'.
Question 4
1 / -0

Which group represents external genitalia of human female?

A
Labium minora, labium majora, vagina

B
Labium minora, labium majora, oviduct

C
Labium minora, labium majora, cervix

D
Labium minora, labium majora, clitoris

Solution

The external genitalia of human female consists of:
Mons pubis - It is the anterior most part and is covered with pubic hair and skin.
Clitoris - Present posterior to mons pubis and is homologous to the glans penis as it contains the erectile tissues.
Labium majora - Large fleshly folding and is covered with sebaceous glands. It is considered to be homologous to scrotum.
Labium minora - Small fleshly folding which are homologous to penile urethra.
Thus, the correct answer is 'Labium minora, labium majora, clitoris'.
Question 5
1 / -0

Which provides nutrition to maturing sperms?

A
Leydig cell

B
Scrotum

C
Epididymis

D
Sertoli cells

Solution

Sertoli cells provides nutrition to maturing sperms. Sertoli cells occur in human testes. Each lobule of testes contains one to three seminiferous tubules in which the sperms are produced. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and sertoli cells. Sertoli cells are also known as nurse cells. They provide nutrition to spermatozoa. Spermatozoa are developing sperms. Heads of spermatozoa are embedded in the sertoli cells. Sertoli cells also secrete called inhibin which suppresses FSH synthesis.
Question 6
1 / -0

Which of the following statement is false?

A
Menarche is beginning of menstruation

B
Menstruation is shedding of endometrial lining

C
Menopause occurs in the beginning of puberty

D
Ovulation occurs under high titre of LH
Solution
Correct Answer: (C) Menopause occurs at the beginning of puberty.
Explanation:
The beginning of menstruation in adolescent females is termed menarche.
During the menstruation cycle, the shedding of the endometrial lining of the uterus of females is marked by the menstruation period.
Due to the LH surge ovulation takes place in females from the mature graffian follicle.
When the woman reaches the age of 45-50 the menstrual cycle stops and this phase is called menopause.
Hence, Menopause occurs at the beginning of puberty is a false statement hence the correct option.
Question 7
1 / -0

In a regulatory cycling human female, which can be root cause of menstrual failure?

A
Fertilization of ovum

B
Maintenance of hypertrophical endometrial lining

C
Maintenance of high titre of sex hormones

D
Retention of well developed corpus luteum

Solution

Menstrual cycle starts with the menstrual flow (menses), this is followed by follicular phase. During this phase secretion of gonadotropins (LH and FSH) and estrogens. In the middle of the cycle, rapid secretions of LH and FSH increases leading to LH surge and hence ovulation. Ovum lasts for 24 hours only. If the sperm meets ovum within these 24 hours then it will lead to pregnancy or otherwise, it is followed by the luteal phase during which the remaining parts of Graafian follicle changes into corpus luteum.
So, the correct option is 'fertilization of ovum'.
Question 8
1 / -0

The cavity contained in Graafian follicle is

A
Antrum

B
Centrocoel

C
Blastocoel

D
Archenteron

Solution

Oogenesis is initiated during the embryonic development stage and and couple of million gamete mother cells are formed within each fetal ovary. These cells start division and enter prophase 1 of meiosis division and get temporarily arrested at that stage called primary oocytes. Further, they get surrounded by a layer of granulosa cells and are called primary follicles. They gain new layer of granulosa cells and form secondary follicles which soon transform into tertiary follicles and contain a fluid-filled cavity called antrum. During this time primary oocyte completes its first meiotic division and results in the formation of secondary oocyte. The tertiary follicle further changes into mature follicle of Graafian follicle and forms a new membrane called zona pellucida.
So, the correct option is 'Antrum'.
Question 9
1 / -0

Which one is initiated by secretion of trophoblast?

A
Blastulation

B
Implantation

C
Cleavage

D
Gastrulation

Solution

The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to it known as inner cell mass which gets attached to the endometrium and the inner cell mass gets differentiated into an embryo. After attachment, the uterine cells divide rapidly and covers the blastocyst and it is embedded in the uterus. Therefore a signal or secretion is given by trophoblast initiate implantation which leads to pregnancy.
So the correct option is 'Implantation'.
Question 10
1 / -0

Seminal plasma of humans is rich in

A
Fructose and certain enzymes, poor in Ca$$^{2+}$$

B
Fructose, Ca$$^{2+}$$ and certain enzymes

C
Fructose, Ca$$^{2+}$$ but no enzymes

D
Glucose, certain enzymes but no Ca$$^{2+}$$
Solution
Correct option: B
Explanation:
Seminal plasma is secreted by the seminal vesicles of the male reproductive tract.
Its components are fructose, calcium, and certain enzymes.
The main function of this fluid is to provide nourishment to sperms.
Hence, the seminal plasma of humans is rich in "Fructose, calcium and certain enzymes".

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Human Reproduction Test - 66

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Human Reproduction Test - 66

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Question 1

Amitosis

Mitosis

Meiosis I

Meiosis II

Solution

Question 2

$$4$$

$$1$$

$$16$$

$$32$$

Solution

Question 3

a $$\rightarrow$$ c $$\rightarrow$$ e $$\rightarrow$$ d $$\rightarrow$$ b

c $$\rightarrow$$ a $$\rightarrow$$ d $$\rightarrow$$ b $$\rightarrow$$ e

a $$\rightarrow$$ d $$\rightarrow$$ c $$\rightarrow$$ e $$\rightarrow$$ b

b $$\rightarrow$$ a $$\rightarrow$$ c $$\rightarrow$$ d $$\rightarrow$$ e

Solution

Question 4

Labium minora, labium majora, vagina

Labium minora, labium majora, oviduct

Labium minora, labium majora, cervix

Labium minora, labium majora, clitoris

Solution

Question 5

Leydig cell

Scrotum

Epididymis

Sertoli cells

Solution

Question 6

Menarche is beginning of menstruation

Menstruation is shedding of endometrial lining

Menopause occurs in the beginning of puberty

Ovulation occurs under high titre of LH

Solution

Question 7

Fertilization of ovum

Maintenance of hypertrophical endometrial lining

Maintenance of high titre of sex hormones

Retention of well developed corpus luteum

Solution

Question 8

Antrum

Centrocoel

Blastocoel

Archenteron

Solution

Question 9

Blastulation

Implantation

Cleavage

Gastrulation

Solution

Question 10

Fructose and certain enzymes, poor in Ca$$^{2+}$$

Fructose, Ca$$^{2+}$$ and certain enzymes

Fructose, Ca$$^{2+}$$ but no enzymes

Glucose, certain enzymes but no Ca$$^{2+}$$

Solution

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