Human Reproduction Test

Result

Human Reproduction Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

Identify the human development stage shown below as well as the related right place of its occurrence in a normal pregnant woman and select the right option for the two, together

A
a

B
b

C
c

D
d

Solution

After fertilisation, a single-celled zygote develops into a multicellular structure called blastocyst. This blastocyst then gets embedded in the endometrium of the uterus and the process is known as implantation.
Question 2
4 / -1

Given below are four statements (i)-(iv) regarding embryonic development in humans.
(i) Cleavage divisions bring about considerable increase in the mass of protoplasm.
(ii) With more cleavage divisions, the resultant blastomeres become smaller and smaller.
(iii) The blastomeres in the blastocyst are arranged into two layers, trophoblast and endometrium.
(iv) Cleavage divisions result in a solid ball of cells called morula.
Which of the above two statements are correct?

A
(i) and (iii)

B
(ii) and (iv)

C
(i) and (ii)

D
(iii) and (iv)

Solution

Cleavage is a series of rapid mitotic divisions of the zygote, characterised by absence of growth in daughter cells, which converts a single celled zygote into a multicellular structure called blastocyst. It starts in the Fallopian tube and is holoblastic. Interphase in cleavage division is short and don not involve growth so that the resulting blastomeres become smaller in size as their number increases. During cleavage, at 8-16 celled stage, a solid ball of cells called morula (as it look like mulberry) is formed.
Question 3
4 / -1

In human adult females, oxytocin

A
stimulates pituitary to secrete vasopressin

B
causes strong uterine contractions during parturition

C
is secreted by anterior pituitary

D
stimulates growth of mammary glands

Solution

In human adult females, oxytocin is a hormone released by the pituitary gland (neurohypophysis), that causes contraction of the uterine muscles during labour.
Question 4
4 / -1

Match column I with column II and select the correct option from the codes given.

A
A - (ii), B - (iv), C - (i), D - (iii)

B
A - (i), B - (iv), C - (ii), D - (iii)

C
A - (iv), B - (ii), C - (i), D - (iii)

D
A - (ii), B - (iv), C - (iii), D - (i)
Question 5
4 / -1

The sperms undergo physiological maturation, acquiring increased motility and fertilizing capacity in?

A
seminiferous tubules

B
vasa efferentia

C
vagina

D
epididymis

Solution

In the epididymis, the sperms mature physiologically, gaining increased motility and fertilising capacity.
The epididymis is a long, coiled tube that holds sperm until it is ejaculated. Sperm develops in the epididymis, a long twisted tube. The epididymis' tail attaches to the vas deferens, which transports sperm to the ejaculatory duct. In the epididymis, sperm gain motility.
Question 6
4 / -1

A reaction of granules content which hardens the zona pellucida and ensures sure block to polyspermy is ______________.

A
Acrosomal reaction

B
Cortical reaction

C
Acrosin reaction

D
Binding reaction

Solution

Immediately after the fusion of sperm and egg plasma membranes, the egg shows a cortical reaction. In this reaction, the cortical granules present beneath the egg's plasma membrane fuse with the plasma membrane and release enzymes between it and zona pellucida. These enzymes harden the zona pellucida, which now functions to block polyspermy.
Question 7
4 / -1

Fill up the blanks in the following paragraph by selecting the correct option.
During copulation (coitus), semen is released by the penis into the vagina and is called (i) . The ovum released by the ovary is transported to the (ii) where (iii) takes place. During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of (iv) . The secretions of the (v) help the sperm enter into the cytoplasm of the ovum.

A
a

B
b

C
c

D
d
Question 8
4 / -1

Preparation of sperm before penetration of ovum is

A
spermiation

B
cortical reaction

C
spermiogenesis

D
capacitation.

Solution

The secretions of the female genitaltract remove coating substances deposited on the surface of the sperms particularly those on the acrosome. Thus, the receptor sites on the acrosome are exposed and sperm becomes active to penetrate the egg. This phenomenon of sperm activation in mammals is known as capacitation.
Question 9
4 / -1

Implantation takes place after __________ of fertilisation.

A
5 days

B
6 days

C
7 days

D
8 days

Solution

Implantation is embedding of the blastocyst into the endometrium of the uterus. Implantation begins about 7th day after fertilization of ovum and it takes about 3 days for the process to be completed.
Question 10
4 / -1

Besides activating the egg, another role of a sperm is to carry __________.

A
RNA

B
mitochondria

C
DNA

D
ribosomes

Solution

During fertilization, the head of the sperm containing nucleus (DNA) enters the egg leading to formation of diploid zygote.